Write a js script in a div - javascript

I am trying to get a script from another website using jQuery then document.write it
here is my code
var url = "https://code.jquery.com/jquery-1.10.2.js";
var dam = $.getScript(url);
document.write(dam);
But this doesn't work!!
all what I get on the page is [object Object]
Can this be achieved without XHR?
jsfiddle

Don't use document.write, it does not do what you think it does. What it does not do is write some data at the end of the document. What it does instead, is pipe data into the current write stream. And if there is no write stream, it will make a new one, resetting the document's content. So calling document.write(dam) means you just wiped your document. document.write is a low level JS function from an earlier era of JavaScript, don't use it.
Instead, you want to use modern DOM manipulation functions, so in jQuery, that's stuff like:
$(document.head).append($("<script>").attr("src", url));
where
$("<script>")
builds a new script element,
$(...).attr("src", url)
sets the "src" attribute to what you need it to be, and:
$(document.head).append(...)
or
$(document.body).append(...)
to get the script loaded into your document. If it's a plain script with src attribute, it can basically go anywhere, and if it's a script with text content that should run, you can only make that happen through document.head.
Although if it's just a script you need to load in and run, you can use getScript, but then you don't need to do anything else, it's just:
var url = "https://code.jquery.com/jquery-1.10.2.js";
jQuery.getScript(url);
Done, jQuery will load the script and execute it. Nothing gets returned.
Of course, the code you're showing is loading jQuery, using jQuery, so that's kind of super-odd. If you just want to load jQuery on your page, obviously you just use HTML:
<!doctype html>
<html>
<head>
...
</head>
<body>
...
<script src="http://https://code.jquery.com/jquery-1.10.2.js"></script>
</body>
</html>
with the script load at the end so the script load doesn't block your page. And then finally: why on earth are we loading jQuery version 1.x instead of 2.x? (if you need to support IE8: that's not even supported by Microsoft anymore, so you probably don't need to).
And finally, if we don't want to load the script, but we really just want its content, as plain text, there's only a million answers on Stackoverflow already that tell you how to do that. With jQuery, that's:
$.get("http://https://code.jquery.com/jquery-1.10.2.js", function(data) {
$(document.body).append($("div").text(data));
});
But you knew that already because that's been asked countless times on Stackoverflow and you remembered to search the site as per the how to ask instructions before asking your question, right?

executing the script on the page is not my goal!. I want to get the
script content and put it a div (USING JAVASCRIPT - NO XHR) , is that
possible ?
Try utilizing an <iframe> element
<div>
<iframe width="500" height="250" src="https://code.jquery.com/jquery-1.10.2.js">
</iframe>
</div>
jsfiddle http://jsfiddle.net/snygv469/3/

Make it easier... use my fiddle
http://jsfiddle.net/wwwfzya7/1/
I used javascript to create an HTML element
var url = "https://code.jquery.com/jquery-1.10.2.js";
var script = document.createElement("SCRIPT"); //creates: <script></script>
script.src = url; //creates: <script src="long_jquery_url.js"></script>
document.body.appendChild(script); //adds the javascript-object/html-element to the page.!!!

Use this way, it can fix your problems.
$.get( "https://code.jquery.com/jquery-1.10.2.js", function( data ) {
alert(data);
});

You can try adding
<script src="http://code.jquery.com/jquery-1.8.3.min.js" ></script>
Then an AJAX call, but it pulls data from CACHE. It looks like an AJAX but when <script> is added file goes in cache, then read from cache in the ajax. In cases where it is not stored in cache read it using normal AJAX.
jQuery.cachedScript = function(url, options) {
// Allow user to set any option except for dataType, cache, and url
options = $.extend(options || {}, {
dataType: "text",
cache: true,
url: url
});
// Use $.ajax() since it is more flexible than $.getScript
// Return the jqXHR object so we can chain callbacks
return jQuery.ajax(options);
};
$(document).on('ready', function() {
// Usage
$.cachedScript("http://code.jquery.com/jquery-1.8.3.min.js").done(function(script, textStatus) {
console.log(script);
});
});
Normal Solution
If you are ready to use AJAX look at this fiddle

How to fetch content of remote file and paste it on your document and execute that js code
I guess you want to get content written on remote file and want to write that content in your HTML. to do this you can use load() function.
To do this follow the following steps:
1. Create a file index.html Write the following code in it:
<pre id="remote_script"></pre>
<script>
$(document).ready(function() {
//var url = "https://code.jquery.com/jquery-1.10.2.js";
var url = "remote_script.html";/* For testing*/
$('#remote_script').load(url,function(){
eval($('#remote_script').text()); /* to execute the code pasted in #remote_script*/
});
});
</script>
2. Create another file remote_script.html for testing write alert('a'); in it without any <script> tag and run the above code.

Related

How to remove HTML script tag with open type [duplicate]

How can I remove script elements before they are being executed?
I thought about using the DOMNodeInserted event, but apparently it doesn't catch script elements. I've also tried using the jQuery livequery plugin like that:
$("script").livequery(function () {
$(this).remove();
});
It did remove the script element, but after it was executed.
I'm looking for a cross-browser solution, but I'm not even sure if that's possible. I read about Mutation Observers which seems close enough but I'm not sure if it can solve my problem.
It would be even better if there was a way to modify the script content before it is being executed without removing and recreating it.
Removing a script element does not do anything. If you can somehow access a script element, it was executed a long time ago and removing it will have no effect.
So we need to work around it. If your script element is at the top of the page like this:
<head>
<script src="yourscript.js"></script>
You could make a synchronous ajax request to the same page, so you can parse its content into a new document, modify all script tags and then replace
the current document with the modified document.
var xhr = new XMLHttpRequest,
content,
doc,
scripts;
xhr.open( "GET", document.URL, false );
xhr.send(null);
content = xhr.responseText;
doc = document.implementation.createHTMLDocument(""+(document.title || ""));
doc.open();
doc.write(content);
doc.close();
scripts = doc.getElementsByTagName("script");
//Modify scripts as you please
[].forEach.call( scripts, function( script ) {
script.removeAttribute("src");
script.innerHTML = 'alert("hello world");';
});
//Doing this will activate all the modified scripts and the "old page" will be gone as the document is replaced
document.replaceChild( document.importNode(doc.documentElement, true), document.documentElement);
Unfortunately this cannot be set up in jsfiddle or jsbin. But you should be able to copy paste this code exactly as it is into this
page's console in google chrome. You should see the alerts and when you inspect the live dom, each script was modified.
The difference is that we are running this after scripts have been executed on the page, so the old scripts should still have a working effect on the page.
That's why, for this to work, you need to be the very first script on the page to do it.
Tested to work in google chrome. Firefox is completely ignoring the doc.write call for some reason.
i donot know what you are trying to do. But it is better to load them on request rather than delete on some conditions.
$.getScript('helloworld.js', function() {
$("#content").html('
Javascript is loaded successful!
');
});
If you wants to remove scripts before there execution, its not possible.
But what you can do is, remove script programatically on a condition & if have an issue with memory-leaks, then you can call below code before remove script.
var var1 = 'hello';
var cleanAll = function () {
delete window.var1;
delete window.cleanAll;
};
// unload all resources
cleanAll();

How to display iframe by a Javascript snippet?

I have seen some widgets online that gives the user the possibility of including a short Javascript snippet in their own page, which when executed displays an Iframe, like in the following example.
<div id="fb-root"></div><script src="http://connect.facebook.net/en_US/all.js#appId=APP_ID&xfbml=1"></script><fb:facepile></fb:facepile>
How can I do this by myself - have a javascript on my server, that when called on a remote server, writes out an iframe or loads content into their page?
The traditional way (considered a bit messy; won't work with XHTML-as-XML host pages; if called after page load via async, will blow up the entire page):
document.write('<iframe src="http://www.example.com/myframe" width="100" height="100"></iframe>');
Alternatively with innerHTML to an element on the page with a predefined name:
document.getElementById('examplecomframe').innerHTML= '<iframe src="http://www.example.com/myframe" width="100" height="100"></iframe>';
Or with DOM to insert just before the current <script> (though again that can be unpredictable if deferred):
(function() {
var iframe= document.createElement('iframe');
iframe.src= 'http://www.example.com/myframe';
iframe.width=iframe.height= 100;
document.getElementById('examplecomframe').appendChild(iframe);
})();
Or to insert just before the current script:
var scripts= document.getElementsByTagName('script');
var script= scripts[scripts.length-1];
script.parentNode.insertBefore(iframe, script);
I wouldn't use jQuery for third-party script inclusion. You'd have to load the whole heavy framework into the enclosing page, just for the sake of a few lines of JS. This can cause clashes with other frameworks (or different versions of jQuery) being used by the host page, something very rude for a third-party script to do.
I think you may have how this is working a bit mixed up. The way it's working is this:
1. User requests page from your domain/server, page is served.
2. Client web browser on users machine interprets said page, if a script block includes a reference to a js file at some other location then said js file is fetched.
3. Javascript is processed by the clients browser.
So really all you need is a JS file (plain old ASCII) on the server and have it do some document.write() calls to add the code you want it to add, for example:
go to http://www.shaunhusain.com/TestIFrameViaJS
three files there involved
index.html
anotherpage.html
testIFrame.js
let me know if it doesn't work out or I took a wrong direction for what you're looking for?
Shaun
To generate a Tag with jQuery you can use $('<tagname />') and pass an object with parameters (for example src).
Afterwards you append this iframe to the Dom. Using html() you can set the html-content of a selected element (in this case a tag with id example) to your iframe.
$(function() {
var iframe = $('<iframe />', {
src: 'http://example.com',
width: 100,
height: 100
});
$('#example').html(iframe);
});
http://api.fatherstorm.com/test/4159620.php
using jQuery for this...
$(document).ready(function() {
$('#fb-root').append('<iframe/>');
$('#fb-root iframe')
.attr('id','my_iframe')
.attr('src','http://www.cnn.com')
.css('width','100%')
.css('height','100%')
.attr('frameborder','no');
});

Javascript onload in HTML

I want to ask a question about the Javascript’s onload.
I’m writing a JSP page with the code <%# include file ="body.jsp". The included body.jsp contains:
<table onload="function()">
This should load the javascript function, but it doesn't appear to have any effect on the page. Is onload only usable on the body tag?
Onload can only be used for <body>, <img>, <script>, <iframe> tags, because it tells you when an external resource (image, script, frame) or the whole page (body) has been loaded
Since HTML5 these can also fire a load event: <link>, <style>, <input type=image>, <object>
Support for these can still be a hit or miss though (e.g. older Android browsers)
Why not just include it via a <script tag>?
Inside your .jsp file
<script>
window.onload = function() {
alert("Hello!");
}
// or to execute some function
window.onload = myFunction; //notice no parenthesis
</script>
As the other guys already stated the onLoad event will not fire on a table. What you can do ist attaching the onLoad-handler to the body element (which will then fire, when the page is loaded) and manipulate the table by for example assigning an id to the table.
<body onload="function() { var table = document.getElementById("table-id"); ... }">
<table id="table-id"></table>
</body>
Are you using some javascript framework?
"onLoad" may be used on body- and frameset-tags.
To see some action you may use:
<body onload="function(){alert('This is an action!')}">
The easiest way i find is to use an external javascript file and jquery.
// Variables and functions you want to declare
var socket = io.connect();
// .....
// Function you want to run on load
$(function() {
$('#submit').click(function() {addUser();});
// ... any other functions you want to run on load
});
This is a code snippet from something that i was working on. The variable is declared before the code runs (It creates a web socket).
Then there is the jquery document selector ($) which runs on load and calls the init function to modify my html. I use it to call an anonymous function which runs right away.
You can throw a <script> tag right after your table with code. Once it gets to the script tag it would mean that the DOM for the table element above it has been loaded and can now be accessed in your script below it.
Note: The following below isn't applicable to the question but rather the other answers being given.
I recommend using the addEventListener function in javascript for adding the event. This makes sure that you are not overwriting or going to be overwritten by anyone else wanting to listen to the event.
Example
var iframe = document.getElementsByTagName('iframe')[0];
iframe.addEventListener('load', function(event){ console.log("iframe Loaded", event); })

Controlling the scope of a document.write call coming from a third party

I'm writing a webpage that relies on an external javascript file (that I have no control of), which returns data by using document.write's. Is there any way to dynamically call the function without it overwriting the whole document? Here's the most concise code I can think of:
<html>
<head>
<script type="text/javascript">
function horriblefunction () {
document.write("new text");
}
</script>
</head>
<body>
Starting Text...
<div id="pleasewriteinme"></div>
Other text...
<button onclick="horriblefunction();">Click</button>
</body>
</html>
The idea beginning that without altering "horriblefunction()" (as it's external) the new text could be placed in the div instead of overwriting the page. Is this possible or does the function have to be called inside the div as the page is created?
Thanks for you help
The only way to use document.write after the page has finished rendering is to temporarily replace the function with one of your own making that will shove the content into a div. E.g.
function horriblefunction() {
var old_dw = document.write;
document.write = function(text) {
document.getElementById( 'some_div' ).innerHTML = text;
}
// now call your external JS function that uses document.write
document.write = old_dw;
}
This will work as long as the external JS is already loaded and you're just calling a function. If you need to load the JS (say, by inserting a new <script> tag into the DOM) remember that that operation is asynchronous, and you'll need to watch the DOM to know when it's safe to restore the old version of document.write.
Try using dynamic script loading from http://bezen.org/javascript/index.html
bezen.domwrite.js - Captures document.write and writeln for the safe loading of external scripts after page load.

How to embed and call a javascript script in a RichFaces/JSF page

I've been looking around for a method to embed and call javascript functions in JSF pages. I'm also using RichFaces.
To define the function, it appears I can do this in a cross-browser supported fashion:
<a4j:outputPanel ajaxRendered="true">
<f:verbatim>
<script type="text/javascript">
function datum() {
alert("hi");
}
</script>
</f:verbatim>
</a4j:outputPanel>
but I'm not sure how I can call this function when the page loads so the text it returns is embedded in an h:outputPanel. The plan is to have a js clock embedded in the page which is served to the client. Note I'm not using the body tag, I'm using facelets ui:composition, f:view (core) and RF RI rich:page.
Thanks
Regardless of what sorts of server-side tags you're using, by the time your page gets to the browser that's all gone and it's just HTML. (At least, it had better be, or things won't work anyway.) What you need to do is arrange for your code to be called by a "load" event handler. There are various ways to do this, but the simplest would be this:
<f:verbatim>
<script type="text/javascript">
window.onload = function() {
alert("hi");
}
</script>
</f:verbatim>
Now as to initializing another part of the page, once again what matters is what ends up in the HTML. You'll want to arrange for there to be some sort of HTML container (a <div> or something, depending on your page design) and you'll want it to have a unique "id" attribute. Your Javascript can then use the "id" to find the element and set its contents:
var elem = document.getElementById("whatever");
elem.innerHTML = // ... whatever ;
You'd probably do that stuff inside the "load" function.
Also, if you're using Facelets instead of JSP, which is a XML based view technlogy, you will need to add the XML CDATA section delimiters if your JavaScript contains comments // or literals such as <, >, &&, etc. Here's the example with the XML CDATA delimiters:
<f:verbatim>
<script type="text/javascript">
//<![CDATA[
//Comments won't show error now.
window.onload = function() {
alert("hi");
}
//]]>
</script>
</f:verbatim>
You can see a thorough explanation of when to use CDATA here. You do not need those if you're creating HTML5 pages.
Happy coding!

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