Dynamically added script will not execute

问题

I am dynamically adding a script of a github gist. If I added it to the html before the page loads, the script will execute. But If I try to add it to the page after it loads it adds the script to the page but doesn't execute it.

Here is how I am adding it to the page

Html

<div id="results"></div>

Javascript

$('#results').click(function() {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "https://gist.github.com/1265374.js?file=GetGists.js";
    document.getElementById('results').appendChild(script);
    console.log('script added');
});

Here is the live example

http://jsfiddle.net/guanome/JqB3g/3/

回答1:

So, the best option I can see is to override (even if just temporarily while the script loads) document.write. It is sort of a work around, but since you don't control the code coming in, I think it may be the best you've got. You also shouldn't be using document.write anytime after the page loads, but just in case, I'd maybe comb through your code.

Here's a fiddle with a working solution. If you wanted to revert document.write after the script loaded, you can always check to see if script.complete is true, otherwise, listen for an onload event, which should allow you to change document.write back. I'm too lazy to code it into the fiddle at the moment, but this would be the code generally:

script.src = "...";
document.getElementById("results").appendChild(script);
if(script.complete) document.write = document._write;
else script.load(function() { 
    // Goes to the end of the run queue so that the script 
    // is guaranteed to run before this code
    setTimeout(function(){document.write = document._write;},0);
});

回答2:

It's executing, but it won't work since it uses document.write, which can only be used synchronously. Include async document.write, and modify your script as such:

$('#results').click(function() {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "https://gist.github.com/1265374.js?file=GetGists.js";
    document.write.to = {filename: script.src};
    document.getElementById('results').appendChild(script);
    console.log('script added');
});

回答3:

So, as an alternative, I actually just stumbled upon a library which seems like it would handle this for you. Check out Injector.js, and it should work for you.

回答4:

I was able to accomplish this after hours of trying, including all other answers here. My script tag looks like this:

<script src="https://somedomain.com/some.js"></scipt>

so no eval() was possible.

I've used jQuery.getScript() in the end, which fetches the js file and executes it:

var $scriptTag = $('#myElement script');
var scriptSrc = $scriptTag.attr('src');
$.getScript(scriptSrc);

回答5:

your script is executing , you just can't use document.write from it. Use an alert to test it and avoid using document.write. The statements of your js file with document.write will not be executed and the rest of the function will be executed.

回答6:

Try $(this).append(script) or $(this).html(script)

来源：https://stackoverflow.com/questions/7761149/dynamically-added-script-will-not-execute

标签

javascript

script-tag