Script doesn't run after load a div with ajax - javascript

I have the script audiojs for changing the style of audios tag in html when I go to my page it work without problems, but when I click a button to reload div (this div contain audios tags) with function load jQuery the style of audiojs removed, I tried to get script after load the div with jQuery getScript, but the script load many times that caused to stop of my browser.
this is the function to call the audiojs
audiojs.events.ready(function() {
audiojs.createAll();
});
I want a solution to call this function one time no more, thanks

Try to adding a new script tag to with the script to re-load in your code something like below:
<script language="text/javascript">
function audiojs()
{
var div= document.getElementsByTagName('head')[0];
var script= document.createElement('script');
script.type= 'text/javascript';
script.src= 'audiojs.js';
div.appendChild(script);
}
audiojs();
</script>
I hope you will get some ideas now. Also check your caching.

It's hard to know without any link to the audio.js library, but most API's or libraries will give some indication that they are loaded. I would use an if statement to create something like:
(function () {
function checkForLoaded(){
if (audiojs.state !== null) { //or something similar
audiojs.createAll();
}
}
})();

Thanks everyone,
i found the solution,
after loading the div with ajax i added this code to remove the class audiojs
$("audio").removeClass("audiojs");

Related

How to delay script tag until other script tag has run

I've been experimenting with metaprogramming in webpages, and need to delay a script tag from running until just after another script tag has been run. However, the script tag needs to be loaded first or both of them will fail.
Shortened and more readable version of what I'm trying to do:
<script defer>
w=function(){
<stuff that gives a parser error until modified by the next script tag>
}
</script>
<script>
<stuff that changes the previous script tag and any other script tags that ever will be added via the DOM
so it doesn't give a parser error>
</script>
<button onclick='w()'></button>
This would work perfectly well, except that the button's onclick attribute fails because the button was loaded before the first script tag was run.
Thanks in advance!
(EDIT: I linked a pastebin to show the full version of my code, it might clear things up a bit since it seems my summed-up version wasn't very good.
As suggested by #meagar in the comments, if you don't mind changing the type property of your "not actually javascript" script blocks you can do something like this:
<script type='derpscript'>
var derp;
var w=function(){alert('hello')};
derp||=5;
console.log(derp);
</script>
<script>
function compileDerps() {
// find all derpscript script tags
var x = document.querySelectorAll('script[type=derpscript]');
for(var i=0;i<x.length;i++){
meta=x[i].text
while(true){
pastmeta=meta;
console.log(exc=regex.exec(meta))
if(exc){
meta=meta.replace(regex,exc[1]+'='+exc[1]+'||');
}
if(pastmeta==meta){break;}
}
// make a new javascript script tag to hold the compiled derp
var s = document.createElement('script');
s.text = meta;
document.body.appendChild(s);
// delete the derpscript tag
x[i].parentNode.removeChild(x[i]);
}
}
//stuff that changes the previous script tag and any other script tags that ever will be added via the DOM
var regex=/([a-zA-Z$_][a-zA-Z$_1-9]*)(\|\|\=)/;
var meta;
var pastmeta='';
var exc='';
compileDerps();
</script>
<button onclick='w()'>THIS IS W</button>

Asynchronous script load issue

I'm trying to load a script from an external source after the user executes a click function. Like so:
$("#test-button").click(function() {
$.getScript("http://someurl.com/widget/javascript?key=4&t=uid&q=94777&show=all", function (data) {
$('#myDiv').append(data);
});
});
The script I'm loading (which I have no control over) includes a document.write, so I'm getting this error when I execute the click:
It isn't possible to write into a document from an asynchronously-loaded external script unless it is explicitly opened.
I'm not sure how to get around this. I thought getScript would manage this.
It seems like you have append the script like text
please see this example
var script = document.createElement('script');
script.src = '../web3.0/lib/charts/google-charts.js';
document.body.appendChild(script);

Use a JavaScript variable inside src of script tag

Google provides its script embed code to display a trends Map by placing this code in our site.
<script type="text/javascript" src="//www.google.com.pk/trends/embed.js?hl=en-US&q=iphone&cmpt=q&content=1&cid=TIMESERIES_GRAPH_0&export=5&w=500&h=330"></script>
The above code displays the trends map.
Notice the q=iphone in the above URL. I want to pass a JavaScript variable value instead of hard coding a fixed value like iPhone in this case.
How can I use a JavaScript variable inside the src of script tag?
I tried creating script programmatically, it injects the script code but the script does not get executed.
My try
document.body.appendChild(document.createElement('script')).src= varHavingScriptURL;
My try is in a JS Fiddle here.
The problem is, you can not do this after page load. Look at the source of the script
document.write('<iframe width="500" ... </iframe>');
So you need to do this as the page is rendering because of the document.write.
Now looking at what you did
document.body.appendChild(document.createElement('script')).src = varHavingScriptURL;
That is not going to work, you need to break it up
var scr = document.createElement('script');
scr.src = varHavingScriptURL;
document.getElementsByTagName("head")[0].appendChild(scr);
but again, it is not going to work because of the document.write.
Finally after hours of struggle, I found the solution using PostScribe.
// jQuery used as an example of delaying until load.
$(function
() {
// Build url params and make the ad call
var str= "magic";
postscribe('#ad', '<script src=//www.google.com.pk/trends/embed.js?hl=en-US&q='+str+'&cmpt=q&content=1&cid=TIMESERIES_GRAPH_0&export=5&w=500&h=330><\/script>');
});
Postscribe
Working Demo

Detect whether external script has loaded

Using JavaScript, is there a way to detect whether or not an external script (from a third-party vendor) has completely loaded?
The script in question is used to pull in and embed the markup for a list of jobs and, unfortunately, doesn't make use of any variables or functions. It uses document.write to output all of the content that gets embedded in my page.
Ideally, I'd like to display some kind of loading message while I'm waiting for the external script to load, and if it fails to load, display a "We're sorry, check back later..." message.
I'm using jQuery on the site, but this external script is called before I make the jQuery call.
Here's what the document.write stuff from the external script looks like:
document.write('<div class="jt_job_list">');
document.write("
<div class=\"jt_job jt_row2\">
<div class=\"jt_job_position\">
Position Title
</div>
<div class=\"jt_job_location\">City, State</div>
<div class=\"jt_job_company\">Job Company Name</div>
</div>
");
Attach an function to the load event:
<script type="text/javascript" src="whatever.js" onload ="SomeFunction()" />
As far as your loading... problem goes, try displaying a div for loading and then just display:none-ing it in your onload function. Make sure to handle cases where your script fails to load too, though.
Script tags block downloads, so as long as the content dependent on your script is below where your script it loaded, you should be fine. This is true even if the script is in-line in the body of your page.
This website has a great example of how this works.
This obviously does not work if you're loading the scripts asynchronously.
Scripts without async or defer attributes are fetched and executed immediately, before the browser continues to parse the page.
Source: MDN
You could put a script block after it on the page:
<script src="external_script.js"></script>
<script type="text/javascript">
ExternalScriptHasLoaded();
</script>
Thanks for the assistance above, especially ngmiceli for the Steve Souders link!
I decided to take what's probably a "lazy" approach, and also forego the "loading" message:
$(document).ready(function(){
if ($('.jt_job_list').length === 0){
$('#job-board').html("<p>We're sorry, but the Job Board isn't currently available. Please try again in a few minutes.</p>");
};
});
Pretty simple, but I'm looking to see if an element with the .jt_job_list class is in the dom. If it isn't, I display an error message.
This worked for me: it does however, rely on the newer querySelector interface which most modern browsers support. But if you're using really old browsers, you can use getElement... and run a for loop.
function loadJS(file, callback, error, type) {
var _file = file ;
var loaded = document.querySelector('script[src="'+file+'"]') ;
if (loaded) {
loaded.onload = callback ;
loaded.onreadystatechange = callback;
return
}
var script = document.createElement("script");
script.type = (typeof type ==="string" ? type : "application/javascript") ;
script.src = file;
script.async = false ;
script.defer = false ;
script.onload = callback ;
if (error) {
script.onerror = error ;
}
else {
script.onerror = function(e) {
console.error("Script File '" + _file + "' not found :-(");
};
}
script.onreadystatechange = callback;
document.body.appendChild(script);
}
You could give what ever your looking for an ID
and check whether not the ID has been loaded using document.getElementById("ID");
Is that what your looking for not sure I fully understand?

How to insert a javascript file into an iframe then call a function in the inserted javascript?

Edit: Just found out this is a chrome problem, the code works fine in firefox
I have an iframe on a webpage that shows a book formatted as html. I would like to insert some javascript within this iframe to make the book more dynamic (e.g. click on sentences, show animations etc). The iframe content is in the same domain as the parent page.
I can insert the javascript into the iframe but get an error calling a function in the inserted javascript. I've described the different bits of code below:
My parent page javascript is:
function iframeLoaded()
{
var iFrameID = document.getElementById('preview-iframe');
var jsLink = iFrameID.contentDocument.createElement("script");
jsLink.src="/tests/iframeAPI.js";
jsLink.type = 'text/javascript';
iFrameID.contentDocument.head.appendChild(jsLink);
iFrameID.contentWindow.initialiseApi()
}
and the html containing the iframe is:
<iframe id="preview-iframe" width="640" height="240" frameborder="0" src="./testpage.htm" onload="iframeLoaded()" scrolling="no"></iframe>
The contents of iframeAPI.js is:
window.initialiseApi = function() { alert("Hello world") }
Looking at the iFrame's html in the browser shows that the iFrameAPI.js tag is inserted ok into the iframe head, but I don't get the alert popup when the page is loaded. The error appears on the following line:
iFrameID.contentWindow.initialiseApi()
Uncaught TypeError: Object [object Window] has no method 'initialiseApi'
However I can run this line in the browser's javascript console and the alert popup works fine.
Any help would be much appreciated.
Thanks,
Brian
Edit: I've just tried with an onload event to make sure the page is loaded and I still have the problem:
My parent page javascript is now :
function iframeLoaded()
{
var iFrameID = document.getElementById('preview-iframe');
var jsLink = iFrameID.contentDocument.createElement("script");
jsLink.src="/tests/iframeAPI.js";
jsLink.type = 'text/javascript';
iFrameID.contentDocument.head.appendChild(jsLink);
jsLink.onLoad= iFrameLoaded();
}
function iFrameLoaded()
{
alert("Iframe loaded"); // Alert works ok
var iFrameID = document.getElementById('preview-iframe');
iFrameID.contentWindow.initialiseApi(); // Same error message on this line
}
It sounds like you are trying to use the function before the content has loaded.
try this instead:
var t = setTimeout(iFrameID.contentWindow.initialiseApi(),500);
This will wait half a second before trying the function which should give the page tiem to load. Delay times are given in milliseconds.
An even better approach is to try using Jquery and its ready() method but this requires the jquery library to be loaded as well. Its well worth it though in my opinion, see http://api.jquery.com/ready/.
You would try something like:
$("body",iFrameID.contentWindow.document).ready(iFrameID.contentWindow.initialiseApi())
You're executing it right away without giving the script a chance to load. Hook up an onload event to your script block and run your main function then.
Try, in the page included in the iFrame, accessing the main page by doing something like:
window.parent.xyz = something;
Where something is what you want exposed to the main page. Could be a function or an object of functions. Now in the main page you can just do:
something(); // or something.somefunction();
You could also send window references, I think, but I have not tried that.
The easiest way is to call the initialiseApi function in the iframeAPI.js itself as it will be called as soon as it's loaded. The iframeAPI.js could look like that:
function initialiseApi() {
alert("Hello world");
}
initialiseApi();
There is no callback or timeout needed.

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