I'm trying to get the entire HTML of a page, but it seems that the text stops after </head>. The following code is essentially how I tested this. What am I doing incorrectly here?
<html>
<head>
<script>
document.onload = showHTML();
function showHTML() {
html = document.documentElement.innerHTML;
alert(html);
}
</script>
</head>
<body>
<p> This is absolutely useless text. </p>
</body>
</html>
Okay here is a complete working answer... after checking already posted answer I realized it didn't work for multiple reasons..
First you need to put a function in the onload event. The onload event is written without uppercases.
Also! you need to put the event on the window object as such:
window.onload = showHTML;
Here is a fiddle. Notice on the left that it isn't wrapped inside onload. It's unwrapped in head like your code should be.
http://jsfiddle.net/4zsGH/2/
You should have something like this:
<html>
<head>
<script>
window.onload = showHTML;
function showHTML() {
var html = document.documentElement.outerHTML;
alert(html);
}
</script>
</head>
<body>
<p> This is absolutely useless text. </p>
</body>
</html>
Take off the parenthesis from document.onLoad = showHTML();
What's happening is showHTML() is being called right away, before the rest of the document is being loaded. Taking off the parenthesis means the function is being set to the onLoad callback.
Try:
<html>
<head>
<script>
document.onload = showHTML;
function showHTML() {
var html = document.documentElement.outerHTML;
alert(html);
}
</script>
</head>
<body>
<p> This is absolutely useless text. </p>
</body>
</html>
When you wrote document.onLoad = showHTML(); you didn't assign the reference to showHTML function to document.onLoad but you assigned the value returned by that function i.e. undefined (because you called it). I also changed innerHTML to outerHTML.
Also document.onload shouldn't be written in camel case.
Writing var html = … isn't essential but it wouldn't run in strict mode. Without it you create a html property on global object window implicitly.
I think this is what you are looking for:
document.onLoad = showHTML();
function showHTML() {
var html = document.documentElement.innerHTML;
alert(html);
}
http://jsfiddle.net/skhan/4zsGH/
Related
I'm a noob in JQuery, trying my hands on the basic functionality of it
I have a html, like below.
<html>
<head>
<script type="text/javascript" charset="utf-8" src="js/jquery-2.0.3.min.js"></script>
<script type="text/javascript" src="js/start.js"></script>
<script>
$(mainFunction());
$('#label1').prop('innerHTML', "test");
</script>
<title></title>
</head>
<body>
<label id="label1"></label>
</body>
</html>
From start.js, i'm trying to manipulate the elements in this html file like below.
function start(name){
this.iam = name;
this.getName = function(user){
return this.iam;
}
}
function mainFunction(){
var label = $('#label1');
var oStart = new start("test");
label.prop("innerHTML" ,oStart.getName("test"));
}
When I try to lookup whats in the 'label' in the above code, i get [] printed on the console. What am I doing wrong here?
$(mainFunction()); is your issue. Instead provide function reference to document.ready.
Like this:
$(mainFunction);
While doing $(mainFunction()); you are invoking the function mainFunction while setting up the handler, which means it gets executed too early before the DOM tree has been constructed.
Or in order to avoid confusion you could do:
$(function(){
mainFunction();
});
Also remember that this issue will not happen if you move your script just before the end of the body tag. You do not have to listen to document ready handler. Plus as a shorthand you could just do label.html(oStart.getName("test"));
You need to wait for the DOM to be ready before using jQuery.
This is done this way:
$(document).ready(function() {
// All your code touching the DOM in here
});
Also note that this line: $(mainFunction()); uses the return value of mainFunction, it does not trigger it when DOM is ready.
I'm learning javascript and studying this example:
<html>
<body>
<p id="p1">Hello World!</p>
<script>
document.getElementById("p1").innerHTML="New text!";
</script>
</body>
</html>
My question is why doesn't the script work properly when the line with <p id="p1">Hello World!</p> is below the script, and what happens during its execution? Thank you.
Because the JavaScript is run when the browser encounters it, when compiling/rendering the page; not once it's finished rendering the page. So, if the element appears after the script it doesn't (yet) exist at the point at which the JavaScript is run.
You could, though, create a function and have that function run once an element has loaded, for example:
<script>
function bodyLoaded(){
document.getElementById('p1').innerHTML = 'New text!';
}
</script>
<body onload="bodyLoaded()">
<!-- HTML here... -->
<p id="p1"></p>
</body>
Javascript is an interpreted language. 'interpreted' means that it:
"executes instructions directly, without previously compiling a
program into machine-language instructions"
Hence because the javascript interpreter executes instructions on the page line by line (starting from the top of the page), the order in which code is defined is crucial. So in your example the paragraph element has to be defined before your call to getElementById.
Elements must be defined in order for JavaScript to recognize them. If you chose to put your JavaScript inside the <head> tag, then you can do this with the window.onload event. This can be done several ways.
//Obtrusive JavaScript
<html>
<head>
<script>
function loadMe(){
var doc = document;
function E(e){
return doc.getElementById(e);
}
E('p1').innerHTML = 'New text!';
}
</script>
</head>
<body onload='loadMe'>
<p id='p1'>Hello World!</p>
</body>
</html>
/* Unobtrusive JavaScript ---> the way you should learn it in my opinion
Notice there's no onload attribute in the body tag. Also, I use onload
instead of window.onload, because window is implicit, just as document
is a property of window as well.
*/
<html>
<head>
<script>
onload = function(){
var doc = document;
function E(e){
return doc.getElementById(e);
}
E('p1').innerHTML = 'New text!';
}
</script>
</head>
<body>
<p id='p1'>Hello World!</p>
</body>
</html>
Of course, you should use external JavaScript whenever possible.
I have a code that works in JSFiddle but doesn't work when I save the HTML+JS locally and test it locally. I can't figure out what's wrong with the code. Here is my JSFiddle
http://jsfiddle.net/LLUAB/
And here is the actual code, not very long
<!doctype html>
<html>
<head>
<script type="text/javascript" language="Javascript">
function Composer(foobox) {
this.foobox = document.getElementById(foobox);
this.foobox.onkeydown = function(){window.alert("hello")};
}
var myComposer = new Composer("foo");
</script>
</head>
<body>
<textarea id="foo"></textarea>
</body>
</html>
Because in JSFiddle your script is placed inside window.onLoad event handler by default. While in your case getElementById() method is unable to find not yet loaded element.
Put all your script right before closing </body> tag and it will work:
<script type="text/javascript">
// ...
</script>
</body>
It works in Fiddle because of onLoad option specified here. The problem is that when new Composer line is fired, there's no such element in the DOM yet. Wrap this line in DOMReady handler - or move its invokation to the end of <body> element.
It's because your dom is not ready yet
function Composer(foobox) {
this.foobox = document.getElementById(foobox);
alert(this.foobox); --Prints null
this.foobox.onkeydown = function(){window.alert("hello")};
}
Working code here. http://jsfiddle.net/LLUAB/1/
I have tried, as many have suggested, saving a variable as the .value or .innerHTML of an ID, found by using document.getElementById. Here is all of my HTML:
<html>
<head>
<title>write</title>
<script type="text/javascript" src="g.js"></script>
<link rel="stylesheet" type="text/css" href="g.css" />
</head>
<body>
<div id="box">
<textarea id="txt" placeholder="placeholder. type here.">text text</textarea>
</div>
</body>
</html>
and here is my javascript, currently meant to fire an alert that contains the text in the text area – right now that would be, text text:
function run(){
var txt = document.getElementById('txt');
alert(txt);}
run()
Right now, loading the page fires an alert with the text Null and adding .value after getElementById('txt') results in no alert. Many thanks in advance.
The problem is that your javascript is executing before the DOM is constructed. When you load the JavaScript file in the <head> of the document, it is executed immediately, before the <textarea> tag has been created.
Try moving your script block below the textarea, just before the </body> tag.
Here's an example: fiddle
After the DOM is constructed you can use getElementById just as have and can access the contents of the textarea with the value attribute. All of this is in the fiddle above.
Alternatively, you can wrap your run() method call with a library that provides an event when the DOM becomes ready. jQuery's example would be:
$(function () {
// code you want to execute when the DOM is ready.
run();
});
function run() {
var txt = document.getElementById("txt").value;
alert(txt);
}
$(document).ready(function(){
run();
});
check this jsfiddle link
You are not getting textarea value because your javscript function is getting executed before there's value in DOM
or using javascript
function run(){
var txt = document.getElementById("txt").value;
alert(txt);
}
window.onload = run();
More about window.onload
The javascript below works in firefox. In fact, if you click the answer button for this question, you can try it out in firebug on this very page...
var textArea = document.getElementById("wmd-input"); // #wmd-input is the text input where your answer goes...
alert( textArea.value );
Make sure you enter some text first, of course.
While you're at it, you should give jQuery a try:
alert( $("#wmd-input").val() );
Or better yet,
console.log($("#wmd-input").val());
Hope that helps.
Ok, I haven't been using JavaScript without JQuery for quite some time now... But, as coding goes, I have to do without it's power for a project where I can't be sure that JQuery is provided.
The thing I'm trying to do would be the following using JQuery:
$(document).ready(function() {
$('#myDiv').append('<ul><li>a</li><li>b</li></ul>');
});
Now to the non-jquery thing, this is what I have and I really can't understand why it isn't working:
<html>
<head>
<script type="text/javascript">
function load() {
var s = '<ul><li>a</li><li>b</li></ul>';
var element = document.getElementById("myDiv");
element.innerHtml += s;
}
</script>
</head>
<body onload="load()">
<div id="myDiv"></div>
</body>
</html>
Thing is, nothing happens (the function gets called though). Could it be that the DOM isn't ready when load() is called?. I vaguely remember this code working in the firefox 2.x IE7 era ...
What would be the (a) right solution?
It's innerHTML not innerHtml. Notice the upper case HTML. Change that and it should work fine! Here's a working example.
By using innerHtml you are simply creating a new property on the element object and giving it the value of s.
<html>
<head>
<script type="text/javascript">
function load() {
var s = '<ul><li>a</li><li>b</li></ul>';
var element = document.getElementById("myDiv");
element.innerHTML += s;
}
</script>
</head>
<body onload="load()">
<div id="myDiv"></div>
</body>
</html>
JS is case sensitive
I think you want element.innerHTML += s;.