How to dynamically insert a <script> tag via jQuery after page load?
JavascriptJqueryScript TagJavascript InjectionJavascript Problem Overview
I'm having problems getting this to work. I first tried setting my script tags as strings and then using jquery replaceWith() to add them to the document after page load:
var a = '<script type="text/javascript">some script here</script>';
$('#someelement').replaceWith(a);
But I got string literal errors on that var. I then tried encoding the string like:
var a = '&left;script type="text/javascript">some script here<\/script>';
but sending that to replaceWith() outputs just that string to the browser.
Can someone please let me know how you would go about dynamically adding a <script> tag into the browser after page load, ideally via jQuery?
Javascript Solutions
Solution 1 - Javascript
You can put the script into a separate file, then use $.getScript to load and run it.
Example:
$.getScript("test.js", function(){
alert("Running test.js");
});
Solution 2 - Javascript
Try the following:
<script type="text/javascript">
// Use any event to append the code
$(document).ready(function()
{
var s = document.createElement("script");
s.type = "text/javascript";
s.src = "http://scriptlocation/das.js";
// Use any selector
$("head").append(s);
});
Solution 3 - Javascript
Here's the correct way to do it with modern (2014) JQuery:
$(function () {
$('<script>')
.attr('type', 'text/javascript')
.text('some script here')
.appendTo('head');
})
or if you really want to replace a div you could do:
$(function () {
$('<script>')
.attr('type', 'text/javascript')
.text('some script here')
.replaceAll('#someelement');
});
Solution 4 - Javascript
A simpler way is:
$('head').append('<script type="text/javascript" src="your.js"></script>');
You can also use this form to load css.
Solution 5 - Javascript
This answer is technically similar or equal to what jcoffland answered. I just added a query to detect if a script is already present or not. I need this because I work in an intranet website with a couple of modules, of which some are sharing scripts or bring their own, but these scripts do not need to be loaded everytime again. I am using this snippet since more than a year in production environment, it works like a charme. Commenting to myself: Yes I know, it would be more correct to ask if a function exists... :-)
if (!$('head > script[src="js/jquery.searchable.min.js"]').length) {
$('head').append($('<script />').attr('src','js/jquery.searchable.min.js'));
}
Solution 6 - Javascript
Here is a much clearer way — no need for jQuery — which adds a script as the last child of <body>:
document.body.innerHTML +='<script src="mycdn.js"><\/script>'
But if you want to add and load scripts use Rocket Hazmat's method.
Solution 7 - Javascript
Example:
var a = '<script type="text/javascript">some script here</script>';
$('#someelement').replaceWith(a);
It should work. I tried it; same outcome. But when I used this:
var length = 1;
var html = "";
for (var i = 0; i < length; i++) {
html += '<div id="codeSnippet"></div>';
html += '<script type="text/javascript">';
html += 'your script here';
html += '</script>';
}
$('#someElement').replaceWith(a);
This worked for me.
Edit: I forgot the #someelement (btw I might want to use #someElement because of conventions)
The most important thing here is the += so the html is added and not replaced.
Leave a comment if it didn't work. I'd like to help you out!
Solution 8 - Javascript
There is one workaround that sounds more like a hack and I agree it's not the most elegant way of doing it, but works 100%:
Say your AJAX response is something like
<b>some html</b>
<script>alert("and some javscript")
Note that I've skipped the closing tag on purpose. Then in the script that loads the above, do the following:
$.ajax({
url: "path/to/return/the-above-js+html.php",
success: function(newhtml){
newhtml += "<";
newhtml += "/script>";
$("head").append(newhtml);
}
});
Just don't ask me why :-) This is one of those things I've come to as a result of desperate almost random trials and fails.
I have no complete suggestions on how it works, but interestingly enough, it will NOT work if you append the closing tag in one line.
In times like these, I feel like I've successfully divided by zero.
Solution 9 - Javascript
If you are trying to run some dynamically generated JavaScript, you would be slightly better off by using eval. However, JavaScript is such a dynamic language that you really should not have a need for that.
If the script is static, then Rocket's getScript-suggestion is the way to go.