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  1. BACKGROUND: Working with Matomo has compelled me to dig deeper into the way that information gets passed over the internet. Up until now I have assumed that I can pass just about anything in a query string. In fact, this is exactly what I have been doing. What I am beginning to realize is that the PHP $_POST and $_GET variables have been doing work of which I was not aware. I have come to this conclusion with my new encounter of the encodeURI(), encodeURIComponent(), decodeURI(), and decodeURIComponent() functions. Indeed, I have read that no information can be passed in an HTTPRequest
  2. Hello I have the following javascript code.It is suppose to execute when the html page is done loading but in stead it executes and then nothing happend (the page seems like it is loading something but nothing ever happens) Here is my code : function LoadXML() { if(window.XMLHttpRequest) { var xmlhttp = new XMLHttpRequest(); } else{ var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function () { if (this.readyState == 0) {
  3. I'm using somewhat unusual navigation, as seen here. When a user mouses over the bars, they slide out into view. All of that is working fine. The problem is, I cannot find the CSS to make the buttons align left of the edge of the screen (as seen in the image), regardless of the display dimensions. I originally tried: <style> #container {width: 600px; height: 25px; position: relative;} #bar0, #bar1, #bar2, #bar3, #bar4, #bar5 {position: absolute; left: -340px;}"; </style> Which worked perfectly. But only on my scre
  4. i want to build a bar chart with chartJS and database mysql with two different query, but bar chart not showing. can anyone help me to correct the code? this my query and javascript: <?php $a = mysqli_query("select count(a) as total1 from tbl"); $b = mysqli_query("select count(b) as total2 from tbl"); ?> <body> <div> <canvas id="chart"></canvas> </div> <script> var ctx = document.getElementById("chart"); var chartdata = { labels: 'CHART', datasets: [{ label: "A", dat
  5. Please find below the Javascript insertion <script> tag that Matomo uses to track user behavior on a webpage. <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//{$PIWIK_URL}/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', {$IDSITE}]); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.j
  6. Ok, so I have 4 combo boxes with $Year, $Month, $Type, $extension to create file name of URL. http://www.myOrg.Org/Articles/$Month + $Year + MyOrg + $Type . $extension This is what I have (doing only 1 variable - Year). <form> Select the year: <select id="mySelect"> <option>2018</option> <option>2017</option> <option>2016</option> <option>2015</option> </select> Select the month: <select id="mySelect1"> <option>January</option> <option>Februar
  7. Hi everyone, A few weeks ago, Douglas Lowder from Salesforce made a brilliant talk about his port of React Native for Apple Tv. I was thinking that it could interest some here to see him describes how he did it. Thanks!
  8. This seems so simple: var aC = document.getElementById("arrowCanvas"); var context = aC.getContext("2d"); var img = document.getElementById("arrowImage"); context.drawImage(img, 225, 225); context.rotate(90 * Math.PI / 180); But the canvas never rotates. Also tried: var aC = document.getElementById("arrowCanvas"); var context = aC.getContext("2d"); var img = document.getElementById("arrowImage"); context.rotate(90 * Math.PI / 180); context.drawImage(img, 225, 225); But here, the canvas never even shows up.
  9. I'm having a problem determining if a given control has focus. It seems to me that: if (form.password.focus() == true) ... should tell me if the form's password control has focus. But, it's returning "false" even while I'm typing into the control. So, what is the correct way to determine whether a control has focus? Thank you!
  10. I need to create variable names in a loop (part of this seems to be working) and then get 26 of the 39 variables to perform simple math (for example: variable -= 10). Getting the variables recognized as variables, and not text, seems to be the issue. This works properly, it accesses 13 canvases named canvas1 through canvas13: for (i = 1; i < 14; i++) { c = document.getElementById("canvas" + i.toString()); context = c.getContext("2d"); ... } However, when I try to dynamically create canvas names, and dynamically create 2 variables
  11. BACKGROUND: Earlier I posted a script from Matomo that serves as a counter for page hits and various other bits of information gleaned from a user's behavior on a webpage that bears the script. Although I now understand what the code does, I would like to understand its purpose. In particular, I would like to understand the probable reason for assigning to a variable another variable with the same name. The full code is given as: <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (f
  12. smus

    Array cloning

    Sorry for stupid question. I can't understand the purpose of cloning an array in JS. Why do we need it? What is the difference between: let a = []; let b = a; and: let a = []; let b = a.slice(0);
  13. Although by no means fully recovered from a recent machine failure, I am back on the road in a much weakened condition. Please consider the following piece of code and correct me where my interpretation of the code is in error. <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//{$PIWIK_URL}/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', {$IDSITE}]); var d=document, g=d.createElement('script'), s
  14. Hello I need to get the value of a CSS Filter, Hue in this case, that's currently being applied to a canvas. I tried this: var hue = document.getElementById('canvas1').style.filter('hue-rotate'); and it did not work, several variations on that theme also failed. What is the correct syntax? Thank you very much PS: this could apparently also work var hue = getComputedStyle(canvas1).filter But it will not retrieve just the hue. Thank you
  15. I am going to create a Extension for internet explorer but i am not able to understand how to start creating Extension for internet explorer.
  16. I have searched in vain for an answer to this problem, but I am getting no where. Here is the issue: I have a search form that works fine as a desktop application. On mobile devices there is a problem. If a user starts typing in the search input, and then taps one of the words that pops up in predictive text (such as on an iphone), this word then fills the input. The search form returns no matches because, as I have discovered, the only thing being submitted is what the user actually typed before tapping the predictive hint. For example, if they start typing Pennsylvania but only type "P
  17. We had a ton of problems with React to handle our states. We adopted Redux, and after a short period we could finally just focus on producing features and not bugs Here is a video of the last meetup we did in San Francisco: Using Redux at scale. Here is the source medium article for those who cannot listen to the video: https://blog.matters.tech/10-redux-tips-from-the-trenches-55e06ed1c0a8
  18. I tried including the 'tab.html' and ‘content.html’ into my 'index.html' (using w3school code: how to include HTML, found at: https://www.w3schools.com/howto/howto_html_include.asp), but the javascript and css elements do not work. The buttons don't work as intended. Look at: https://rads-198409.appspot.com If you minimize the browser window, the tab is supposed to change to a drop-down menu, but the button does not work at all. I have checked the individual pages and they seem to work just fine, just not when they are combined. Am I doing something wrong? Could someone help? All th
  19. I have a form written using HTML5 and CSS3, final validation is performed on submit with JavaScript. Then, the form will be sent to the server, most likely using PHP's mail() function. I don't recall how to include two items such as these in a form's action="...", I'd deeply appreciate if someone could refresh my memory! Thank you
  20. REQUEST: Please compare the results in the middle panel of the following two actions: ACTION ONE: Click on the phrase Weekly Podcasts under the heading Products in the navigation bar of the Grammar Captive mainpage. Scroll to the bottom of the page and view how the middle panel exceeds the height of the navigation bar and side panel. ACTION TWO: While on the same page with the same panel open click on the phrase Click and Listen. This will bring you to a different document in the same window. Notice that the middle panel does not exceed the height of the na
  21. Suggestion 1: I had an idea for w3school for a very long time and this idea will help people learn better and even make school suggest it more. Add in a tutorial where people will have to figure how how to fix codes like it's almost like the try-it-out but you have to go through courses and learn programming through that, almost like khan academy almost except with programming except khan academy only teaches html and not PHP. And also it wouldn't hurt to show videos of how to understand PHP more. And also how to create websites like facebook and youtube and have interactive videos as well l
  22. I'm trying to use Base64 to compare two images to see if they are identical. The images are accessed using: var thumb5Original = ""; var thumb5Edited = ""; thumb5Original = canvas5.toDataURL('image/png'); thumb5Edited = canvas5.toDataURL('image/png'); I then check them using this: if (thumb5Original.toString() == thumb5Edited.toString()) document.getElementById('tHeader5').innerHTML = "Original Image"; if (thumb5Original.toString() != thumb5Edited.toString()) document.getElementById('tHeader5').innerHTML = "Edited Image"; The problem is, I'm getting "Edited Image" e
  23. Hello, I may post this in the wrong forum and if I do then I'm sorry. I recently looked at the ToDoList tutorial on w3schools, and it is fine and works amazing but its one thing that I wanna add. When I add a item to the list I want that item to stay there forever, so even if I for example refresh the page it will still be there. And even if I go out of chrome it will still be there. I don't know if this is possible but if it is then please answer this. Thanks in advance!
  24. hey w3s... so i have this code: <div class="container-fluid"> <div class="row"> <div class="col-md-12"> <h2 class="font-weight-bold text-center">WORK</h2> <div class="border"></div> <br /> </div> </div> </div> <div class="container main_wrapper"> <section> <div class="container"> <div class="row" id="work-grid"> <?php $query_1 = "SELECT * FROM admvideo ORDER BY video_id DESC";
  25. REQUEST: Please compare the following two links: one works and the other does not. LINK ONE (functional): This link is accessed by going to the Grammar Captive mainpage and clicking on the words Weekly Podcast under the Products heading in the navigation bar. When the panel opens find the phrase Click and Listen. You should be redirected to the podcast_hostpage. LINK TWO (dysfunctional): This is accessed by going to the mainpage and clicking on the word Podcasts under the heading Search Grammar Captive in the navigation bar. When the panel opens search for the single word podc
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