How do I change the script tag with a script DOM? Previously I used a script like this
<script src="https://code.jquery.com/jquery-2.2.2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
But I want to use the script DOM. when I change like this, script not working
<script>
var jquerymin = document.createElement('script');
jquerymin.type = 'text/javascript';
jquerymin.async = true;
jquerymin.src = 'https://code.jquery.com/jquery-2.2.2.min.js';
document.getElementsByTagName('head')[0].appendChild(jquerymin);
var jqueryui = document.createElement('script');
jqueryui.type = 'text/javascript';
jqueryui.async = true;
jqueryui.src = 'https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js';
document.getElementsByTagName('head')[0].appendChild(jqueryui);
</script>
Is DOM script, cant run script jquery.min and jquery.ui?
If you want to use pure Javascript to add (asynchronously) a new script file, you can do this:
<html>
<head>
<title>JS</title>
</head>
<body>
<script type="text/javascript">
var
scriptElement,
script;
scriptElement = document.createElement('script');
scriptElement.src = "https://code.jquery.com/jquery-2.2.2.min.js";
script = document.getElementsByTagName('script')[0];
script.parentNode.insertBefore(scriptElement, script);
</script>
</body>
</html>
Related
I'm trying to add a JustGiving widget to my website but it doesn't display at all. I had other scripts in the file which I thought might be interfering so I ended up testing in a new plain html file and it still wouldn't work.
Interestingly enough if I copy/paste it into a W3 schools code editor it works! It's the same exact code and I cannot work out why it doesn't load in an html file.
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="jg-charity-events-board" data-config="id=45107">123</div>
<script>
(function(d) {
var jg = d.createElement('script');
jg.type = 'text/javascript';
jg.async = true;
jg.src = (d.location.protocol == 'https:' ? 'https://widgets.justgiving.com/charity-events-board/host.js' : 'http://widgets.justgiving.com/charity-events-board/host.js');
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(jg, s);
})(document);
</script>
</body>
</html>
Why do you just not use something like this? Didn't test but I assume it works.
<div id="scripts"></div>
<script>
var url = document.location.protocol + '//widgets.justgiving.com/charity-events-board/host.js';
var script = '<script type="text/javascript" src="${url}"></script>';
document.getElementById("scripts").innerHTML = script;
</script>
And jQuery has html and append functions for this.
I'm trying to load some polyfills only if the user needs them but I can't get the scripts to download and be executed in order causing errors.
Dependencies have the asynchronous attribute and the main code has the defer attribute although is located at the end of the body tag so much of the parsing is already done.
Is there any simple way of doing this without using a preloader?
<html>
<head>
</head>
<body>
<script>
// Google Analytics
</script>
<script>
var firstScript = document.getElementsByTagName('script')[0];
if (!self.fetch) {
var fetchScript = document.createElement('script');
fetchScript.src = '/js/fetch.min.js';
fetchScript.async = 1;
firstScript.parentNode.insertBefore(fetchScript , firstScript);
}
if (!self.URLSearchParams) {
var urlspScript = document.createElement('script');
urlspScript.src = '/js/url-search-params.min.js';
urlspScript.async = 1;
firstScript.parentNode.insertBefore(urlspScript , firstScript);
}
</script>
<script defer src="/js/main.min.js"></script>
</body>
</html>
I want to append two variables to a script tag in react.js. I have created the script tag in the head of the document like so:
const script = document.createElement('script');
document.getElementsByTagName('head')[0].appendChild(script);
However, I wish to append two JS variables inside the <script></script> tags, so it is the following:
<script>
var io_install_flash = false;
var io_install_stm = false;
</script>
The following code would add the script to head tag:
const script = document.createElement('script');
script.innerHTML = `<script>
var io_install_flash = false;
var io_install_stm = false;
</script>`
document.head.appendChild(script);
I am trying to first create an iframe and then inject into it jQuery library and then have an alert to say that jQuery has loaded.
The jQuery library is being inserted into the iframe head as expected and the alert on jQuery load into the body.
The problem is, it does not show the alert and instead says jQuery is not defined.
Can anyone suggest anything?
Here is the code
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<title>iFrame Test</title>
</head>
<body>
<script>
var insertScript = function(src){
var script = document.createElement('script');
script.type = 'text/javascript';
script.async = false;
script.src = src;
$('iframe').contents().find('head')[0].appendChild(script);
}
var insertScriptContent = function(code){
var script = document.createElement('script');
script.type = 'text/javascript';
script.async = false;
script.innerHTML = code;
$('iframe').contents().find('body')[0].appendChild(script);
}
$(function(){
$('iframe').load(function(){
var contents = $('iframe').contents();
insertScript('https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js');
insertScriptContent('jQuery(function(){ alert("loaded"); });');
});
});
</script>
<div class="output">
<iframe></iframe>
</div>
</body>
</html>
You're loading jQuery asynchronously (despite the script.async=false) and then loading your alert script immediately after that. jQuery is not yet loaded when that script runs, so you get the undefined jQuery reference.
As a quick fix, I added a setInterval() that waits until jQuery is defined. I also made these other changes:
Removed the script.async = false; both places because it doesn't do any good.
Removed the $('iframe').load() wrapper. When I tested your code, the callback function in that wrapper never gets called at all. That's not surprising since nothing is being loaded into the iframe at that point.
Changed the two places where you use document.createElement() to use the iframe document (called iframedoc in my version) instead. It works OK using document, but I'm a bit more comfortable creating those scripts under the document they will be loaded into.
Changed two instances of ...find(something)[0].appendChild(); to the simpler ...find(something).append();.
Here's the working code:
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript">
</script>
<title>iFrame Test</title>
</head>
<body>
<script type="text/javascript">
$(function() {
var $contents = $('iframe').contents();
var iframedoc = $contents[0];
var insertScript = function(src) {
var script = iframedoc.createElement('script');
script.type = 'text/javascript';
script.src = src;
$('iframe').contents().find('head').append(script);
}
var insertScriptContent = function(code) {
var script = iframedoc.createElement('script');
script.type = 'text/javascript';
script.innerHTML = code;
$('iframe').contents().find('body').append(script);
}
insertScript('https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js');
insertScriptContent(
'var timer = setInterval( function() {' +
'if( typeof jQuery == "undefined" ) return;' +
'clearInterval( timer );' +
'jQuery(function(){ alert("loaded"); });' +
'}, 50 )'
);
});
</script>
<div class="output">
<iframe></iframe>
</div>
</body>
</html>
That was good for a first pass, but there's a simpler way to do it. I tried replacing the two script functions with jQuery code, so here is another working version:
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript">
</script>
<title>iFrame Test</title>
</head>
<body>
<script type="text/javascript">
$(function() {
var $contents = $('iframe').contents();
$contents.find('head').append(
'<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"><\/script>'
);
$contents.find('body').append(
'<script>' +
'jQuery(function(){ alert("loaded"); });' +
'<\/script>'
);
});
</script>
<div class="output">
<iframe></iframe>
</div>
</body>
</html>
Oddly enough, this one works OK without the setInterval() timer, so I took that code out. I'm not sure exactly why this works - which is not a comforting feeling - but it does seem to be consistent in the browsers I tested it in.
And finally, here is a non-working experiment. In the past I've used document.write() targeting an iframe to good effect. So I thought I would try that:
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript">
</script>
<title>iFrame Test</title>
</head>
<body>
<script type="text/javascript">
$(function() {
var $contents = $('iframe').contents();
var iframedoc = $contents[0];
iframedoc.write(
'<!doctype html>',
'<html>',
'<head>',
'<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.js"><\/script>',
'</head>',
'<body>',
'<script>',
'debugger;',
'jQuery( function(){ alert("loaded"); } );',
'<\/script>',
'</body>',
'</html>'
);
});
</script>
<div class="output">
<iframe></iframe>
</div>
</body>
</html>
This version does load jQuery and the inline script into the iframe, and it executes the jQuery() call in the inline script. But it never calls the callback function with the alert() in it. This actually relates to something I'm working on, so I'll probably take another look at it tomorrow, but in the meantime I left the experimental code in case you're curious. I changed it to use the uncompressed jQuery inside the iframe for easy debugging, and left a debugger; statement in there.
I am building an image gallery that is slider based and loads new images via javascript and have a requirement to set the Google +1 button's URL via javascript so +1 can be set on each image.
I also need to reload the +1 button based on each image (the url will have a querystring parameter containing the image id to make it unique). Is this possible?
<!-- Place this tag where you want the +1 button to render -->
<div class="g-plusone" data-annotation="inline" data-href="#"></div>
<!-- Place this render call where appropriate -->
<script type="text/javascript">
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
You can use the following code to alter the gplus href attribute using jQuery. Make sure to include jquery library first and then use the code below:
<script type="text/javascript">
jQuery(".your-button").click(function(){
jQuery(".g-plusone").attr("data-href","Your-Value-Goes-Here");
});
</script>
Write this in head tag:
// Load +1 script
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
The HTML Code:
<div id="plusone_container">
</div>
And write this jQuery anywhere you want to set +1 button's url:
$("#plusone_container").html('<div id="plusone"></div>');
gapi.plusone.render("plusone", { "href": "Your URL" });