I am trying to include jQuery from a javascript file. I have tried the following, although it doesn't work.
var script = '<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>';
document.getElementsByTagName('head')[0].appendChild(script);
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AppendChild doesn't automatically parse HTML stringsDave– Dave2013年05月03日 23:32:13 +00:00Commented May 3, 2013 at 23:32
7 Answers 7
</script> closes the opening <script> block, even if it's in a string. I would do it this way:
(function() {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = document.location.protocol + '//code.jquery.com/jquery-1.9.1.min.js';
document.getElementsByTagName('head')[0].appendChild(script)
})();
3 Comments
text/javascript when you omit the type, so they never execute the script.You can't have </script> anywhere inside a script block, not even inside a string, because it will end the script block there.
Break up the ending tag in the string:
var script = '<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></scr'+'ipt>';
Comments
Just use the jQuery getScript() method to load jQuery: http://api.jquery.com/jQuery.getScript/
...Just kidding.
Try this code:
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'http://code.jquery.com/jquery-1.9.1.min.js';
head.appendChild(script);
From: http://unixpapa.com/js/dyna.html
Also, if using on an https page, you will need to load the script from an https compatible CDN, like the Google Hosted Libraries (src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js")
Comments
(function() {
var script = document.createElement('script');
script.type = "text/javascript"; // keeping older browsers happy.
script.src = window.location.protocol + '//code.jquery.com/jquery-1.9.1.min.js';
// browsers prevent cross-protocol downloading.
(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(script);// In Opera a site can get by without a <head>
})();
1 Comment
window.location.protocol leaves the colon at the end.var script = document.createElement('script');
script.src = 'http://code.jquery.com/jquery-1.9.1.min.js';
document.getElementsByTagName('head')[0].appendChild(script);
Comments
using a tiny re-usable script adder:
function fetch(url){
var d=document, s='script';
d.getElementsByTagName(s)[0].parentNode.appendChild(d.createElement(s)).src=url;
}
fetch('//code.jquery.com/jquery-1.9.1.min.js');
not all pages have HEADs in all browsers, but if a script is running, so can a sibling script tag...
Comments
First of all, the variable script contains the sequence </script> which you can not make it appears as it is in your code, because browser will assume(and it must) that it is <script> tag close.
for example if your script code contains syntax error, which is a string variable that has no close " it will looks like
<script>var bad = "abcd ;</script>
to solve this you can break the </script> string like "</scr" + "ipt>" or you could escape it: "<\/script>"
so:
var script = '<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"><\/script>';
document.getElementsByTagName('head')[0].appendChild(script);
Second thing is that appendChild() function accept a Node element and not a string
so:
var script = document.createElement("script");
script.src = "http://code.jquery.com/jquery-1.9.1.min.js";
document.getElementsByTagName("head")[0].appendChild(script);
Anyway, I prefer to use a module and JavaScript loader like RequireJS.