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Hello potential helpers, im currently having issues with firing an ajax request inside of another ajax request. Heres my code: Im not getting "alert(content)" Condition if(shop[1] == "gserver") and if(name.includes(shopname) == true) are definetly true. The function is correctly called as well. No Im not using jquery for reasons. Anyone has an idea why the 2nd requests isnt fired? Is it not waiting for the first one to finish? function initiate_shop_game(shopname) { var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if(this.readyState == 4 && this.status == 200) { var obj = this.responseText; var array = eval("[" + obj + "]"); var r = 1; for(var i = 0; i < array.length; i++) { for(var x = 0; x < array[i].length; x++) { var shop = array[i][x] + ''; shop = shop.split(","); if(shop[1] == "gserver") { var name = shop[2]; var imgname = shop[7] var shopvalues = shop[3].split("{%TEND%}"); var minslots = parseInt(shopvalues[1]); var maxslots = parseInt(shopvalues[2]); var minram= parseInt(shopvalues[3]); var maxram = parseInt(shopvalues[4]); var pricea = (parseFloat(shop[5]) / 30); var priceb = (parseFloat(shop[6] / 30)); var content = [name,imgname,minslots,maxslots,minram,maxram,pricea,priceb]; if(name.includes(shopname) == true) { var div = document.createElement('div'); div.id = name; var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if(xmlhttp.readyState == 4 && xmlhttp.status == 200) { alert(content); }; xmlhttp.open('POST',"/template_shop.php", true); xmlhttp.send(); } } } } } } }; xmlhttp.open('POST',"/get_shop_data.php", true); xmlhttp.send(); }

Hello, so at the store page, when in mobile view the top dropdown menu doesn't work. When I delete parts bit for bit in the footer PHP file the menu will still not work. If I delete everything in the footer PHP file it will still not work. But if I completely change the PHP file name so it isn't linked to the store page at all, the dropdown menu works perfectly fine. I find this really weird and I can't figure out how to fix it. Can somebody help?

First of all, I'm no way near any skilled "programmer" or website builder, I mostly just copy things and modify the styles and stuff! So this is probably a nooby question, you have been warned. I've this website I'm building for a school project and I've a few problems left and I've given up trying to fix them, I need to start working on other stuff. First of all so am I trying to get this slider between the three pictures and the navigation bar in the supposedly start page, but the animation disappear when you put it in and I don't think the autoplays work either. This is the main thing I'm trying to do. Secondly, When you go on mobile view and press the dropdown menu it doesn't seem to find the script, which i don't understand why. In the header I have <script src="/online-store-header/js/flertdown.js"></script> and the body I've the code <a href="javascript:void(0);" style="font-size:25px;position: absolute; top: 65px; right: 0; border: 0;" class="icon" onclick="specificName()">☰</a> The console returns this error: Uncaught TypeError: Cannot read property 'className' of null at specificName (flertdown.js:3) at HTMLAnchorElement.onclick (final.html:195) Dropdown js code Any help would be really appreciated, i really need to be done this site soon :)) And I'm really sorry if the index file is totally chaos, elements seems to have a life of their own and come back and reproduce to multiple of the same element after I've deleted them, I've lost control of what i've created (or copied)

So I've searched the web and tried for hours now and I'm just giving up. I've this header, and I want it so when you're on mobile it looks like something like this. So when you're on desktop the full menu is in the header and if your're on mobile you get a dropdown menu. Can someone tell me how I do this? Thank you

I want to use a gif I made for my sprite (it would be nice if the gif only played when the character moved) So far, I have a rectangle with choppy character movements. (It would also be nice if I could make the character movement smoother. I watched tons of tutorials but I couldn't find anything that shows how to do what I want to do. Here is the code <!DOCTYPE html> <html> <head> <style type="text/css"> #backgroundColor { width: 100px; height: 100px; background-color: white; animation-name: backgroundChange; animation-duration: 45s; animation-iteration-count: infinite; } @keyframes backgroundChange { 0% {background-color: white;} 3.3% {background-color: #ffc5c5;} 6.6% {background-color: #f78a8a;} 10% {background-color: #f95d5d;} 13.3% {background-color: #f73737;} 16.6% {background-color: red;} 20% {background-color: #b70303;} 23.3% {background-color: #8c0202;} 26.6% {background-color: #5a0202;} 30% {background-color: #310101;} 33.3% {background-color: black;} 36.6% {background-color: #292929;} 40% {background-color: #3c3c3c;} 43.3% {background-color: #757575;} 46.6% {background-color: #d0d0d0;} 50% {background-color: white;} 53.3% {background-color: #ffc5c5;} 56.6% {background-color: #f78a8a;} 60% {background-color: #f95d5d;} 63.6% {background-color: #f73737;} 66.6% {background-color: red;} 70% {background-color: #b70303;} 73.3% {background-color: #8c0202;} 76.6% {background-color: #5a0202;} 80% {background-color: #310101;} 83% {background-color: black;} 86.6% {background-color: #292929;} 90% {background-color: #3c3c3c;} 93.3% {background-color: #757575;} 96% {background-color: #d0d0d0;} 100% {background-color: white;} } #canvas{ height: 540px; width: 6350px; position:absolute; top:50%; left:52%; transform: translate(-50%,-50%); box-shadow: 0 0 16px 2px rgba(0,0,0,0.4); background-color: #FFF; } </style> <title>Bermuda Triangle</title> </head> <body id="backgroundColor"> <img id="character" style="height: 40px; width: 40px;" src="https://piskel-imgstore-b.appspot.com/img/9478ea0f-79c8-11e8-b58c-67762e4a73c8.gif"> <canvas id='canvas' style="background-image:url(https://preview.ibb.co/fEanjo/realroom.jpg); height: 540px; width: 635px;"></canvas> <script> var canvas = document.querySelector('#canvas'); var context = canvas.getContext('2d'); var xPos = 0; var yPos= 0; context.rect(xPos, yPos, 40, 40); context.stroke(); function move(e) { //alert(e.keyCode); if(e.keyCode==83){ yPos+=10; } if(e.keyCode==87){ yPos-=10; } if(e.keyCode==65){ xPos-=10; } if(e.keyCode==68){ xPos+=10; } canvas.width=canvas.width; context.rect(xPos, yPos, 40, 40); context.stroke(); } document.onkeydown = move; </script> </body> </html>

Hey there, I have followed the tutorial for the w3 raspberry pi led pwm Gpio controller using node.js (https://www.w3schools.com/nodejs/nodejs_raspberrypi_rgb_led_websocket.asp) unfortunately though it uses internal scripts and stylesheets. I have tried using express.static to set up file hosting but I couldn’t get it to work. I am needing to host additional files for the web server to read. I am fairly new at node.js so it might have been the way I was trying to implement it that caused the issue. Thanks in advance

Being reasonably new at generating javascript, I am trying to create a form where the client enters the State of Birth (Queensland, Victoria, Tasmania etc) and by using javascript the Country of Birth is auto filled with "Australia". I have got to a stage where I can auto fill the Country field with a small js script with either onClick or mouseOver however I am at a loss with the code to be able to fill the Country field by entering the state name in the State field. At 75 I'm running out of brains and would appreciate a little help please. Autofill.html

I am trying to copy form inputs from 3 address fields to corresponding duplicate fields in another section of my form. If I use the following script and html the process works perfectly. <input type="checkbox" id="copy" value="" name="copy" onclick="CopyAddress(this.form)"> <script> function CopyAddress(f) { if(f.copy.checked == true) { f.bstr.value = f.gstr.value; f.bsubcit.value = f.gsubcit.value; f.bstate.value = f.gstate.value; f.bpcode.value = f.gpcode.value; } else { f.bstr.value = ""; f.bsubcit.value = ""; f.bstate.value = ""; f.bpcode.value = "";} } <script> I would like to change the checkbox to a button like so: <input type="button" id="copy" value="Copy" name="copy" onclick="CopyAddress(this.form)"> However once I change to a button, the script will not run and I can't work out why. My limited understanding tells me the fault lies in line 2 of the JS, if(f.copy.checked == true). Can anyone tell me where I am going wrong please.

FIXED IT! I placed my script a little lower on the document! Worked... no clue why tho :/

Easy tutorial: HTML5 Canvas + pure JavaScript http://slicker.me/fractals/animate.htm

I think it would be great to have small group projects .We could build login system; with air tight state of the art security, photo gallary's, audio gallery's. I think it would be a great tool for learning web development . Just a thought.

Hello people Can You help me with an Jave script ( it is unreadable and I think its also compiled or something like that ) I have try'd to look at it with an DeCompiler but it keeps unreadable It is used for calculations in another part of de system ( XML scripts ) The system (soft- and hard-ware) is made by an company that is not able to get service of this product. Because of problems with the system I'm trying to figure out how the software works. But this script is the part that is not possible to see what is going on in it. Filename = Calculations.js Note: It is running on an "Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40 GHz With Windows 7 Ultimate" system When someone can get the file more readable much thanks. calculations.js

Dear W3schools community, I want to check if a required input is empty (has more then 0 characters). You guys have any idea what I'm doing wrong? Thanks in advance! If there is no character in input (id="vname") I still get a red "bar" Here's my code: function foobar() { var vname = document.getElementById('vname').value; if (vname.length > 0 && vname != '' && vname != null) { document.getElementById('contact-response').style.color = 'green'; document.getElementById('contact-response').innerHTML = "foo"; } else { document.getElementById('contact-response').style.color = 'red'; document.getElementById('contact-response').innerHTML = "bar"; } } I also tried length, null and '' separately. I also tried doing it with isEmpty(). Also I tried using || instead of &&. Nothing worked yet. Heres my HTML: <div id="wrapper-contact"> <form> <input type="text" id="vname" placeholder="*Vname" required="yes"> <input type="button" onclick="foobar()" value="Senden"> <p id="contact-response"></p> </form> </div>

Hello, I can't figure out how to pause my animation when the cursor hovers over the slide. Here is my code: <!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <style> .mySlides {display:none; height:130px} .w3-left, .w3-right, .w3-badge {cursor:pointer} .w3-badge {height:13px;width:13px;padding:0} </style> <body> <div class="w3-content" style="max-width:600px"> <div class="mySlides w3-animate-right" > <p>I really enjoyed my experience at LIV. The staff are very professional and friendly. I will be sure to refer some friends</p> <p> -Shaun <p> </div> <div class="w3-content" style="max-width:600px"> <div class="mySlides w3-animate-right"> <p>I have been welcomed by everyone and shown many kindnesses, along with hints of places to go, things to do and even assurances of safety on the streets as I walked home after the evening sessions. I came, I learned and I grew in my practice. I found peace. You have all carved a big space in my heart.</p> <p> -Debbie <p> </div> <div class="w3-content" style="max-width:600px"> <div class="mySlides w3-animate-right"> <p>I thoroughly enjoyed my first class. Looking forward to trying out the other classes soon. Thank you!</p> <p> -Lorna <p> </div> <div class="w3-center w3-container w3-section w3-large w3-text-white" style="width:100%"> <div class="w3-left w3-hover-text-khaki" onclick="plusDivs(-1)">&#10094;</div> <div class="w3-right w3-hover-text-khaki" onclick="plusDivs(1)">&#10095;</div> <span class="w3-badge demo w3-border w3-transparent w3-hover-white" onclick="currentDiv(1)"></span> <span class="w3-badge demo w3-border w3-transparent w3-hover-white" onclick="currentDiv(2)"></span> <span class="w3-badge demo w3-border w3-transparent w3-hover-white" onclick="currentDiv(3)"></span> </div> </div> <script> var slideIndex = 1; showDivs(slideIndex); function plusDivs(n) { showDivs(slideIndex += n); } function currentDiv(n) { showDivs(slideIndex = n); } function showDivs(n) { var i; var x = document.getElementsByClassName("mySlides"); var dots = document.getElementsByClassName("demo"); if (n > x.length) {slideIndex = 1} if (n < 1) {slideIndex = x.length} for (i = 0; i < x.length; i++) { x.style.display = "none"; } for (i = 0; i < dots.length; i++) { dots.className = dots.className.replace(" w3-white", ""); } x[slideIndex-1].style.display = "block"; dots[slideIndex-1].className += " w3-white"; } var myIndex = 0; carousel(); function carousel() { var i; var x = document.getElementsByClassName("mySlides"); for (i = 0; i < x.length; i++) { x.style.display = "none"; } myIndex++; if (myIndex > x.length) {myIndex = 1} x[myIndex-1].style.display = "block"; setTimeout(carousel, 3000); } </script> </body> </html> What am I missing? Thanks!!

Hello, this is my first time posting, and I wanted to know how to start of on an id using the W3Schools Tab function. Here is the code! <!DOCTYPE html> <html lang="en"> <head> <title>(null)'s Website</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <link href="V1.css/Home.V1.css" rel="stylesheet"> <link href="V1.css/Home.V1.Slideshow.css" rel="stylesheet"> <script type="text/javascript" src="V1.js/Tabs.js"></script> <script type="text/javascript" src="V1.js/Slideshow.js"></script> <script src="https://www.w3schools.com/lib/w3data.js"></script> </head> <body> <div class="tab"> <button class="tablinks" onclick="openCity(event, 'Home')">Home</button> <button class="tablinks" onclick="openCity(event, 'News')">News</button> <button class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</button> </div> <div id="Home" class="tabcontent"> <h3>Home</h3> <h2>Automatic Slideshow</h2> <p>Change image every 2 seconds:</p> <div class="slideshow-container"> <div class="mySlides fade"> <div class="numbertext">1 / 3</div> <img src="V1.png/NEW!.png" style="width:100%"> <div class="text">Loving the look of our new website?</div> </div> <div class="mySlides fade"> <div class="numbertext">2 / 3</div> <img src="https://img.clipartfest.com/182119c47939e54a12e23325c2153d0d_garfield-clip-art-garfield-clipart_500-500.jpeg" style="width:100%"> <div class="text">Caption Two</div> </div> <div class="mySlides fade"> <div class="numbertext">3 / 3</div> <img src="https://s-media-cache-ak0.pinimg.com/736x/35/a5/26/35a526aa3f44fb009da502db1127a82c.jpg" style="width:100%"> <div class="text">Caption Three</div> </div> </div> <br> <div style="text-align:center"> <span class="dot"></span> <span class="dot"></span> <span class="dot"></span> </div> </div> <div id="News" class="tabcontent"> <h3>News</h3> <button onclick="myFunction('Demo1')" class="w3-btn w3-block w3-black w3-left-align">Updates</button> <div id="Demo1" class="w3-container w3-hide w3-animate-zoom"> <h4>Section 1</h4> <p>Some text..</p> <hr> </div> <button onclick="myFunction('Demo2')" class="w3-btn w3-block w3-black w3-left-align">Announcements</button> <div id="Demo2" class="w3-container w3-hide w3-animate-zoom"> <h4>Section 2</h4> <p>Some text..</p> <hr> </div> <button onclick="myFunction('Demo3')" class="w3-btn w3-block w3-black w3-left-align">Blog</button> <div id="Demo3" class="w3-container w3-hide w3-animate-zoom"> <h4>Section 3</h4> <p>Some text..</p> <hr> </div> </div> <div id="Tokyo" class="tabcontent"> <h3>Tokyo</h3> <p>Tokyo is the capital of Japan.</p> </div> <script> var slideIndex = 0; showSlides(); function showSlides() { var i; var slides = document.getElementsByClassName("mySlides"); var dots = document.getElementsByClassName("dot"); for (i = 0; i < slides.length; i++) { slides[i].style.display = "none"; } slideIndex++; if (slideIndex> slides.length) {slideIndex = 1} for (i = 0; i < dots.length; i++) { dots[i].className = dots[i].className.replace(" active", ""); } slides[slideIndex-1].style.display = "block"; dots[slideIndex-1].className += " active"; setTimeout(showSlides, 10000); // Change image every 2 seconds } </script> <script> function myFunction(id) { var x = document.getElementById(id); if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; } else { x.className = x.className.replace(" w3-show", ""); } } </script> <script> jQuery("#menu li a").click(function(){ var page_url = jQuery(this).attr("href") jQuery(".wide_main").html("<p>loading...</p>"); jQuery(".wide_main").load( page_url + ' #home'); }); </script> </body> </html> What I want to start off on when the html file is loaded, is the 'home' id.

The famous Mandelbrot set: http://slicker.me/fractals/fractals.htm

Hello programmers, Just have met with the above statement which comes with www.veldfiets.nl/whbe2b. I have changed somewhere a thing and mismanaged the smoothscroll in the above way. I cannot find the mistake. Has anybody a clue? It has been a long time ago that I wrestled with the matter and got it working.... Thanks a lot.

Hello. Here is some excerpted code which already works well. ------------------------------------------------------------------------------------------------------- <script type="text/javascript"> function checkForm(form) { if(form.username.value == "") { ... // many more lines </script> <form action="return_to_calling_page.html" onsubmit="return checkForm(this);" id="logonForm" > <p>Username: <input type="email" name="username" autofocus></p> <p>Password: <input type="password" name="pwd1"></p> <p>Confirm Password: <input type="password" name="pwd2"></p> <p><br/> <input type="submit" value="submit"> <button type="button" onclick="javascript:location.href='about_page.html'">cancel</button> </p> </form> ... // many more lines ------------------------------------------------------------------------------------------------------- Then the JavaScript question: The checkForm(form) function only checks input data against invalid character types. But we additionally need to check the logon input values are in the company db. So I tried to write and call a modified function which included the checkForm(form) function. But the new modified javascript function verifyLogon() does not seem to run at all? Currently the following modified code is in use (which does not appear to call verifyLogon() successfully): ------------------------------------------------------------------------------------------------------- <form action="return_to_calling_page.html" onsubmit="return verifyLogon();" id="logonForm" > <script type="text/javascript"> function verifyLogon() { alert("Entered verifyLogon()"); // print something, regardless, but never (yet) seen checkForm(form) // checkForm(form) does not (yet) run from here if(checkForm()) { // if checkForm() returns true, do un/pw lookup in db <?PHP some_php_code1 ?> // run some php, sql find un in db if($stmt1 = true) { // if un query returns true, then... <?PHP some_php_code2 ?> // run some php, sql find pw in db if($stmt2 = true) { // if pw query returns true, then... <?PHP some_php_code3 ?> // run some php, sql view customer account db records }else{ alert("Password not found in company db."); } }else{ alert("Username was not found in company db."); } }else{ document.getElementById("logonForm").reset(); // clears the form form.username.focus(); // sets focus to username field return false // return to form } } </script> ------------------------------------------------------------------------------------------------------- Currently, I am not very concerned about the (if) control logic inside the verifyLogon() function. The plan is to fine tune the (if) logic later once the verifyLogon() is running. Mostly now just want to get the verifyLogon() running at all. Thank you.

Dear all, Are JS tutorials of W3Schools written using the latest version of JS, known as ES6 (ECMAScript 6)?

Hi all, Why do we hear and read that js is one of three programming languages a web programmer must learn besides html and css when there are also other widely used server-side languages, such as PHP? Is it because browsers are designed to mainly understand html, css, and js? If there are other reasons, kindly them spell out?

Hi, I am creating a portfolio website. Here I want that the testimonials will scroll horizontally automatically and will pause on hover. Guys, please give me some hints on how can I perform this action. Here is the markup and style. <!DOCTYPE html> <html> <head> <style> body { margin: 0; padding: 0; } .testimonials-container::-webkit-scrollbar { display: none; .testimonials-wrapper { max-width: 100%; height: 450px; border: 1px solid lightgrey; background: linear-gradient(#000000, #777474); padding-left: 25px; padding-right: 25px; position: relative; } .testimonials-quote { width: 100%; text-align: center; padding-bottom: 20px; color: white; } .testimonials-container { width: 100%; height: 100%; text-align: center; display: flex; margin: 0; padding: 0; padding-bottom: 20px; overflow: scroll; } .testimonials-item { min-width: 230.99px; max-width: 230px; height: 70%; background-color: white; margin-right: 20px; margin-left: 20px; color: black; -webkit-transition: 0.5s ease-in-out; -moz-transition: 0.5s ease-in-out; -ms-transition: 0.5s ease-in-out; -o-transition: 0.5s ease-in-out; transition: 0.5s ease-in-out; } .testimonials-item:last-child { margin-right: 0; } .testimonials-item:first-child { margin-left: 0; } .testimonials-image { width: 124px; border-radius: 50%; padding-top: 20px; } .testimonials-image img { width: 150px; height: 150px; border-radius: 50%; margin-left: 30%; } .testimonials-prev, .testimonials-next { position: absolute; top: 50%; padding: 10px 5px; font-size: 25px; color: white; cursor: pointer; z-index: 5; } .testimonials-prev { left: 0; border-radius: 0 3px 3px 0; } .testimonials-next { right: 0; border-radius: 3px 0 0 3px; } .testimonials-prev:hover, .testimonials-next:hover { background-color: white; color: black; } </style> </head> <body> <div class= "testimonials-wrapper"> <div class= "testimonials-quote"> <h1>What Others Say About Us</h1> </div> <div class= "testimonials-container"> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Rahim</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Karim</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Abdullah</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Yasir</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Mahmudullah</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Riad</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Shohan</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> <div class= "testimonials-item"> <div class= "testimonials-image"> <img src= "images/for%20use/tiger.jpg"/> </div> <div class= "testimonialists-name"> <h3>Shohan</h3> </div> <div class= "testimonial">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada.</div> </div> </div> <span class= "testimonials-prev">❰</span> <span class= "testimonials-next">❱</span> </div> <script src= "jquery-3.1.1.min.js"></script> <script> var x = 270; $(document).ready(function() { $(".testimonials-next").click(function() { $(".testimonials-container").scrollLeft(x += 270); }); $(".testimonials-prev").click(function() { $(".testimonials-container").scrollLeft(x -= 270); }); }); </script> </body> </html> Waiting for your great hints. Thank you in advance.

Hi, here is a code. I want to make the .characteristics-quote to stay fixed when scrolling to the .characteristics-wrapper. But When the characteristics-wrapper class scrolling is finished the .characteristics-quote should be vanished. Can you please tell me how I can fix this ? Thank you in advance. <!DOCTYPE html> <html lang= "en-us"> <head> <meta charset= "utf-8"/> <title>About</title> <link rel= "stylesheet" type= "text/css" href= "font-awesome-4.7.0/css/font-awesome.min.css"/> <style type= "text/css"> body { margin: 0; padding: 0; color: white; background-color: black; overflow: auto; } .about { max-width: 100%; height: 200px; background-color: black; color: white; text-align: center; padding-left: 10%; padding-right: 10%; padding-top: 5px; margin: 0; } .characteristics-wrapper { max-width: 100%; padding: 10px; margin-bottom: 200px; border: 1px solid white; overflow: hidden; } .characteristics-quote { max-width: 40%; float: left; transform: translateX(-5%); position: fixed; color: white; } .characteristics-quote h1 { max-width: 70%; text-align: center; margin: auto; padding-top: 100px; } .characteristics-container { max-width: 60%; float: right; text-align: center; position: relative; } .characteristics-item-row1, .characteristics-item-row2 { max-width: 50%; } .characteristics-item-row1 { padding-top: 50px; } .characteristics-item-row2 { position: absolute; top:50px; right: 0; } .characteristics-item { max-width: 80%; display: block; margin: auto; margin-bottom: 20px; margin-top: 20px; } .characteristics-icon { font-size: 60px; padding: 15px; border: 1px solid lightgrey; border-radius: 50%; height: 76px; width: 76px; margin: auto; } .characteristics-item:hover .characteristics-icon{ background-color: white; color: black; -webkit-transition: 0.6s ease-in-out; -moz-transition: 0.6s ease-in-out; -ms-transition: 0.6s ease-in-out; -o-transition: 0.6s ease-in-out; transition: 0.6s ease-in-out; } /**Animations**/ .left { -webkit-animation-name: left; -webkit-animation-duration: 1s; -moz-animation-name: left; -moz-animation-duration: 1s; -ms-animation-name: left; -ms-animation-duration: 1s; -o-animation-name: left; -o-animation-duration: 1s; animation-name: left; animation-duration: 1s; } .right { -webkit-animation-name: right; -webkit-animation-duration: 3s; -moz-animation-name: right; -moz-animation-duration: 3s; -ms-animation-name: rightt; -ms-animation-duration: 3s; -o-animation-name: right; -o-animation-duration: 3s; animation-name: right; animation-duration: 3s; } .scale { -webkit-animation-name: scale; -webkit-animation-duration: 2s; -moz-animation-name: fade; -moz-animation-duration: 2s; -ms-animation-name: scale; -ms-animation-duration: 2s; -o-animation-name: scale; -o-animation-duration: 2s; animation-name: scale; animation-duration: 2s; } .fade { -webkit-animation-name: fade; -webkit-animation-duration: 2s; -moz-animation-name: fade; -moz-animation-duration: 2s; -ms-animation-name: fade; -ms-animation-duration: 2s; -o-animation-name: fade; -o-animation-duration: 2s; animation-name: fade; animation-duration: 2s; } /**Animating from the left**/ @-webkit-keyframes left { from {left: -500px;} to {left: 0;} } @-moz-keyframes left { from {left: -500px;} to {left: 0;} } @-ms-keyframes left { from {left: -500px;} to {left: 0;} } @-o-keyframes left { from {left: -500px;} to {left: 0;} } @keyframes left { from {left: -500px;} to {left: 0;} } /**Animating from the right**/ @-webkit-keyframes right { from {right: -500px;} to {right: 0;} } @-moz-keyframes right { from {right: -500px;} to {right: 0;} } @-ms-keyframes right { from {right: -500px;} to {right: 0;} } @-o-keyframes right { from {right: -500px;} to {right: 0;} } @keyframes right { from {right: -500px;} to {right: 0;} } /**Animating scale**/ @-webkit-keyframes scale { from {transform: scale(3);} to {transform: scale(1);} }@-moz-keyframes scale { from {transform: scale(3);} to {transform: scale(1);} }@-ms-keyframes scale { from {transform: scale(3);} to {transform: scale(1);} }@-o-keyframes scale { from {transform: scale(3);} to {transform: scale(1);} } @keyframes scale { from {transform: scale(3);} to {transform: scale(1);} } /**Fading animation**/ @-webkit-keyframes fade { from {opacity: 0;} to {opacity: 1;} } @-moz-keyframes fade { from {opacity: 0;} to {opacity: 1;} } @-ms-keyframes fade { from {opacity: 0;} to {opacity: 1;} } @-o-keyframes fade { from {opacity: 0;} to {opacity: 1;} } @keyframes fade { from {opacity: 0;} to {opacity: 1;} } </style> </head> <body> <div class= "about"> <h1>Who we are?</h1> <div class= "about-content">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan. Pellentesque commodo, enim nec faucibus tristique, risus nibh ullamcorper velit, sed egestas urna erat sit amet justo.</div> </div> <div class= "characteristics-wrapper"> <div class= "characteristics-quote"> <h1>Main characteristics of our services</h1> </div> <div class= "characteristics-container"> <div class= "characteristics-item-row1"> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-pagelines" aria-hidden="true"></i></div> <div class= "characteristics-title">Innovative</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-cogs" aria-hidden="true"></i></div> <div class= "characteristics-title">Great Features</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-modx" aria-hidden="true"></i></div> <div class= "characteristics-title">Unique Design</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-graduation-cap" aria-hidden="true"></i></div> <div class= "characteristics-title">Well Documented</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> </div> <div class= "characteristics-item-row2"> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-pagelines" aria-hidden="true"></i></div> <div class= "characteristics-title">Innovative</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-cogs" aria-hidden="true"></i></div> <div class= "characteristics-title">Great Features</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item item2"> <div class= "characteristics-icon"><i class="fa fa-modx" aria-hidden="true"></i></div> <div class= "characteristics-title">Unique Design</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> <div class= "characteristics-item"> <div class= "characteristics-icon"><i class="fa fa-graduation-cap" aria-hidden="true"></i></div> <div class= "characteristics-title">Well Documented</div> <div class= "characteristics-description">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam accumsan sed leo eget malesuada. Integer dapibus nisi id eros scelerisque accumsan.</div> </div> </div> </div> </div> <div style= "height: 700px"></div> </body> </html>

Hi, I want to change the background image automatically every 5 second and the indicators should be green. I followed w3schools slideshow tutorial and created this slideshow. But it doesn't seem to work as expectation. Please tell me where I made the mistake. thank you in advance. <!DOCTYPE html> <html> <head> <style> body { margin: 0; padding: 0; } .header-slideshow-container { width: 100%; margin: 0; padding: 0; } .header-slide { display: block; width: 100%; height: 100%; margin: 0; padding: 0; } #header-slide1 { background-image: url("http://www.w3schools.com/howto/img_nature_wide.jpg"); background-repeat: no-repeat; background-attachment: fixed; background-size: 100% 100%; } #header-slide2 { background-image: url("http://www.w3schools.com/howto/img_fjords_wide.jpg"); background-repeat: no-repeat; background-attachment: fixed; background-size: 100% 100%; } #header-slide3 { background-image: url("http://www.w3schools.com/howto/img_mountains_wide.jpg"); background-repeat: no-repeat; background-attachment: fixed; background-size: 100% 100%; } .current-header-slides-container { position: absolute; top: 45%; right: 25px; margin-top: -30px; } .current-header-slide-indicator { width: 15px; height: 15px; border-radius: 50%; margin-bottom: 5px; background-color: black; } </style> </head> <body> <div class= "header-slideshow-container"> <div class= "header-slide" id= "header-slide1"></div> <div class= "header-slide" id= "header-slide2"></div> <div class= "header-slide" id= "header-slide3"></div> <div class= "current-header-slides-container"> <div class= "current-header-slide-indicator"></div> <div class= "current-header-slide-indicator"></div> <div class= "current-header-slide-indicator"></div> </div> </div> <script> var h = window.innerHeight; (function () { 'use strict'; document.getElementsByClassName("header-slideshow-container")[0].style.height = h + 'px'; }()); var headerSlideIndex = 0; headerSlideshow(); function headerSlideshow() { 'use strict'; var i, headerSlides = document.getElementsByClassName("header-slide"), dots = document.getElementsByClassName("current-header-slide-indicator"); for (i = 0; i < headerSlides.length; i++) { headerSlides[i].style.display = "none"; } headerSlideIndex++; if (headerSlideIndex >= headerSlides.length) { headerSlideIndex = 1; } for (i = 0; i < dots.length; i++) { dots[i].style.backgroundColor = "black"; } headerSlides[i-1].style.display = "block"; dots[i-1].style.backgroundColor = "green"; setTimeout(headerSlideshow, 5000); } </script> </body> </html>

Having NULL type as an object to be a bug in js, is there any harm to code this could result in, and what precautions should we take to avoid such harm?