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      Guidelines and Netiquette   03/28/2017

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kaijim

JavaScript Tutorial and Reference

44 posts in this topic

HiI have checked the w3 web site for adding local weather to my web site however I can't seem to find anythingWhat I want to show is location, forecast and have the forecast automatically updated on a daily basisCan you assist?Thanks :)

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See this recent post: http://w3schools.invisionzone.com/index.php?showtopic=4169Please search before posting, if you can't find an answer then create a new topic.cheers :)

More specifically, this post:http://w3schools.invisionzone.com/index.ph...indpost&p=19667You'll have to read the top comments and go to the first URL mentioned. There, download class_http.php. :)

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Anyone developing Javascript should be using a debugger. All professional programmers use debuggers, it's a waste of time to develop without one. If you ask a question in this forum about a Javascript error, please post the output from the debugger. If you don't post the output then my reply to your question will be a link to this topic. If you're going to expect people to take time out to help you with your problems, then you need to take time out to set up your development environment and try to track down the problem on your own first.If you're using Firefox, then you should be developing with Firebug:http://www.getfirebug.com/If you're using IE, then you should be developing with DebugBar:http://www.debugbar.com/If you're using Opera, then you should be developing with the Opera Developer Tools:http://dev.opera.com/tools/If you're not going to take the time to install and use a debugger then don't expect anyone to want to take the time to help you.

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Since this topic is already nice and sticky, I'll post some AJAX functions here to point people back to. I found these on http://www.quirksmode.org/js/xmlhttp.html, you can check the page for more details.This is the Javascript code to include on your pages (inline, or in an external file):

function sendRequest(url,callback,postData) {  var req = createXMLHTTPObject();  if (!req) return;  var method = (postData) ? "POST" : "GET";  req.open(method,url,true);  req.setRequestHeader('User-Agent','XMLHTTP/1.0');  if (postData)	req.setRequestHeader('Content-type','application/x-www-form-urlencoded');  req.onreadystatechange = function () {	if (req.readyState != 4) return;	if (req.status != 200 && req.status != 304) {	  //alert('HTTP error ' + req.status);	  return;	}	callback(req);  }  if (req.readyState == 4) return;  req.send(postData);}var XMLHttpFactories = [	function () {return new XMLHttpRequest()},	function () {return new ActiveXObject("Msxml2.XMLHTTP")},	function () {return new ActiveXObject("Msxml3.XMLHTTP")},	function () {return new ActiveXObject("Microsoft.XMLHTTP")}];function createXMLHTTPObject() {  var xmlhttp = false;  for (var i=0;i<XMLHttpFactories.length;i++) {	try {	  xmlhttp = XMLHttpFactories[i]();	}	catch (e) {	  continue;	}	break;  }  return xmlhttp;}

There is an array of AJAX objects to try to create, a function to actually create the object, and a function to send the request. Using this code, if you want to send an AJAX request and use a function called handler to get the response back, it goes like this:

function handler(resp){  alert("The response came back");  alert(resp.responseText);}sendRequest("ajax.php", handler);

The code is simplified to making setting up and sending a request a 1-line thing, so it should be useful for people trying to learn the concepts of AJAX. If you have a URL-encoded string that you want to submit using post, you can send that as the third argument.var postdata = "mode=edit&id=10";sendRequest("ajax.php", handler, postdata);

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Regarding the code above:

function sendRequest(url,callback,postData) {   var req = createXMLHTTPObject();   if (!req) return;   var method = (postData) ? "POST" : "GET";   req.open(method,url,true);   req.setRequestHeader('User-Agent','XMLHTTP/1.0');   if (postData)     req.setRequestHeader('Content-type','application/x-www-form-urlencoded');   req.onreadystatechange = function () {     if (req.readyState != 4) return;     if (req.status != 200 && req.status != 304) {       //alert('HTTP error ' + req.status);       return;     }     callback(req);   }   if (req.readyState == 4) return;   req.send(postData); }  var XMLHttpFactories = [     function () {return new XMLHttpRequest()},     function () {return new ActiveXObject("Msxml2.XMLHTTP")},     function () {return new ActiveXObject("Msxml3.XMLHTTP")},     function () {return new ActiveXObject("Microsoft.XMLHTTP")} ];  function createXMLHTTPObject() {   var xmlhttp = false;   for (var i=0;i<XMLHttpFactories.length;i++) {     try {       xmlhttp = XMLHttpFactories[i]();     }     catch (e) {       continue;     }     break;   }   return xmlhttp; }

Firebug, Safari and Internet Explorer all return this error:

Function callback() undefined
Unless further explanation is provided, the second argument is unnecessary, and the function to handle server response must be called "callback()", which can be inconvenient if you are reusing this function.

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Yes, that's not how I intended this to be used, I expected that every request you would use a callback with. I can't think of a reason why you wouldn't need a callback. But if you're not using a callback then you can test it before trying to run it.

function sendRequest(url,callback,postData) {  var req = createXMLHTTPObject();  if (!req) return;  var method = (postData) ? "POST" : "GET";  req.open(method,url,true);  req.setRequestHeader('User-Agent','XMLHTTP/1.0');  if (postData)	req.setRequestHeader('Content-type','application/x-www-form-urlencoded');  req.onreadystatechange = function () {	if (req.readyState != 4) return;	if (req.status != 200 && req.status != 304) {	  //alert('HTTP error ' + req.status);	  return;	}	if ((typeof callback) == "function")	  callback(req);  }  if (req.readyState == 4) return;  req.send(postData);}

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The site I linked below is fraken amazing. You can save iterations of code, you can have multiple people comment on it, tidy it up (does the tab formatting for you), you can see javascript errors via JSLint button, and pick your frameworks (different versions of jQuery, Mootools, YUI, and more)! It's a pretty nice has all this and it shows the result. I've only been playing with this for a little while, but I highly recommend it!http://jsfiddle.net/

Edited by retro-starr

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but how the heck do i get the solutions, i mean i got it to function like it said but i wanna make sure i did it 100% correct!
It's actually courseware, so you have to buy the software to see the answers. I just used the site for the tutorial info, not the homework!

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Do a Markup! :good:

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please pple i really need to learn javascript i hav read the tutorials in w3schools and i have book but i dont understand how to apply it to my website am trying to create...please i need help and encoragement javascript is really peasing me off thr hook....

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If you have specific questions then create a topic to ask them, it will help if you provide as much detail as possible about the problem and include whatever code you have so far. Explain what you're trying to do, what you've already done, and what problems you're running into.

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Hi I am trying to greate a fade in on the image which is trigered by a a:hover.I can get the teansition to work on the <a> tag but not the image. <article class="mainContent"> <ul class="contentStyls"> <li><a class="imgLink" href="#">Brick work<img class="hoverImg" src="_images/hoverImg/BrickWork.jpg" /></a></li> </ul></article>

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Hi I am trying to greate a fade in on the image which is trigered by a a:hover.I can get the teansition to work on the <a> tag but not the image. <article class="mainContent"> <ul class="contentStyls"> <li><a class="imgLink" href="#">Brick work<img class="hoverImg" src="_images/hoverImg/BrickWork.jpg" /></a></li> </ul></article>
like its "dim" (opacity .25 or something) and when you hover it becomes "bright" (opacity 1.0)? Or am I not understanding? if so, this is actually done with css no javascript needed:
 .imgLink img{opacity:0.25;     filter:alpha(opacity=0.25);     -webkit-transition: all .2s ease-in-out 0s;     -moz-transition: all .2s ease-in-out 0s;     -o-transition: all .2s ease-in-out 0s;     transition: all .2s ease-in-out 0s;}.imgLink img:hover{cursor:pointer;opacity:1.0;     filter:alpha(opacity=1.0);    -webkit-transition: all .2s ease-in-out 0s;     -moz-transition: all .2s ease-in-out 0s;     -o-transition: all .2s ease-in-out 0s;     transition: all .2s ease-in-out 0s;}

Edited by dzhax

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under the jQuery html the jQuery get I don't understand the tutorial.

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Which part of the tutorial are you having trouble with?

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I HATE IT WHEN A TUTORIAL SPEAK ON, OR DOES NOT PREACH ON THE STRICT MODE!!! I DON'T CARE IF I DON'T NEED TO DO IT ANY MORE LIKE ADD SEMICOLON TO THE END< I WANT TO!!!! OLD TRADITIONAL JAVASCRIPT! I WANT TO LEARN THE STRICT MODE! DO ANY ONE KNOW OF ANY GREAT TUTORIAL THAT PREACH ON THAT FOR BEGINNERS! I WENT THROUGH THE ONE ON HERE TWO TIMES ALREADY, AND WANT TO LEARN NOT MORE BUT WITH ANOTHER TUTORIAL TO GO OVER THE FOUNDATIOD! I WISH TO STRENGTHEN THE FOUNDATION OF IT... I STILL CAN"T PROGRAM OUT OF MEMORY!!!!!!!!!!!!!! HELP ME!!!!!!!!!!!!!!!!!!!!!!!

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"Still can't program out of memory?"

 

This means what?

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You don't want a tutorial, you want a class or a book. Tutorials, by nature, are shallow.

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You don't want a tutorial, you want a class or a book. Tutorials, by nature, are shallow.

 

I want to learn the basic before I move on... I am reading books, One or more I got knowledge of from the website you give me. Thanks again. I can't afford a class room. nor can I handle the environment.Try asking for free passes on online video, but was refuse it.

Edited by L8V2L

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