When should you use `document.all` vs. `document.getElementById`?

document.all vs. document.getElementById

`document.getElementById(&#39;id of div that definately exists&#39;)` returns null.

I originally loaded the javascript last in order to make sure I wouldn&#39;t need to worry about the onload event. I also tried using the onload event. It&#39;s very spooky. Any ideas or help would be greatly appreciated.

getElementById returns null?

I have an XHTML page where each HTML element has a unique custom attribute, like this:

    &lt;div class=&quot;logo&quot; tokenid=&quot;14&quot;&gt;&lt;/div&gt;

I need a way to find this element by ID, similar to `document.getElementById()`, but instead of using a general ID, I want to search for the element using my custom `&quot;tokenid&quot;` attribute. Something like this:

    document.getElementByTokenId(&#39;14&#39;); 

Is that possible? If yes - any hint would be greatly appreciated.

Thanks.

Getting element by a custom attribute using JavaScript

How do I select certain bars in react.js?

This is my code:

    var Progressbar = React.createClass({
        getInitialState: function () {
            return { completed: this.props.completed };
        },
        addPrecent: function (value) {
            this.props.completed += value;
            this.setState({ completed: this.props.completed });
        },

        render: function () {

            var completed = this.props.completed;
            if (completed &lt; 0) { completed = 0 };


            return (...);
        }

I want to use this React component:

    var App = React.createClass({
        getInitialState: function () {

            return { baction: &#39;Progress1&#39; };
        },
        handleChange: function (e) {
            var value = e.target.value;
            console.log(value);
            this.setState({ baction: value });
        },
        handleClick10: function (e) {
            console.log(&#39;You clicked: &#39;, this.state.baction);
            document.getElementById(this.state.baction).addPrecent(10);
        },
        render: function () {
            return (
                &lt;div class=&quot;center&quot;&gt;Progress Bars Demo
                &lt;Progressbar completed={25} id=&quot;Progress1&quot; /&gt;
                    &lt;h2 class=&quot;center&quot;&gt;&lt;/h2&gt;
                    &lt;Progressbar completed={50} id=&quot;Progress2&quot; /&gt;
                    &lt;h2 class=&quot;center&quot;&gt;&lt;/h2&gt;
                    &lt;Progressbar completed={75} id=&quot;Progress3&quot; /&gt;
                    &lt;h2 class=&quot;center&quot;&gt;&lt;/h2&gt;
                    &lt;span&gt;
                        &lt;select name=&#39;selectbar&#39; id=&#39;selectbar&#39; value={this.state.baction} onChange={this.handleChange}&gt;
                            &lt;option value=&quot;Progress1&quot;&gt;#Progress1&lt;/option&gt;
                            &lt;option value=&quot;Progress2&quot;&gt;#Progress2&lt;/option&gt;
                            &lt;option value=&quot;Progress3&quot;&gt;#Progress3&lt;/option&gt;
                        &lt;/select&gt;
                        &lt;input type=&quot;button&quot; onClick={this.handleClick10} value=&quot;+10&quot; /&gt;
                        &lt;button&gt;+25&lt;/button&gt;
                        &lt;button&gt;-10&lt;/button&gt;
                        &lt;button&gt;-25&lt;/button&gt;
                    &lt;/span&gt;
                &lt;/div&gt;
            )
        }
    });

I want to execute the handleClick10 function and perform the operation for my selected progressbar.
But the result I get is:

     You clicked:  Progress1
     TypeError: document.getElementById(...) is null

How do I select the certain Element in react.js?

How to access a DOM element in React? What is the equilvalent of document.getElementById() in React

I&#39;m learning jQuery and was following a tutorial, a very strange error has perplexed me.
Here&#39;s my html : 

    &lt;!doctype html&gt;
    &lt;html&gt;
      &lt;head&gt;
        &lt;title&gt; Simple Task List &lt;/title&gt;
        &lt;script src=&quot;jquery.js&quot;&gt;&lt;/script&gt;
        &lt;script src=&quot;task-list.js&quot;&gt;&lt;/script&gt;
      &lt;/head&gt;
    
      &lt;body&gt;
        &lt;ul id=&quot;tasks&quot;&gt;
         
        &lt;/ul&gt;
          &lt;input type=&quot;text&quot; id=&quot;task-text&quot; /&gt;
          &lt;input type=&quot;submit&quot; id=&quot;add-task&quot; /&gt;
      &lt;/body&gt;
    &lt;/html&gt;
and The jQuery :

    $(document).ready(function(){
        //To add a task when the user hits the return key
        $(&#39;#task-text&#39;).keydown(function(evt){
          if(evt.keyCode == 13)
          {
            add_task(this, evt);
          }
          });
        //To add a task when the user clicks on the submit button
          $(&quot;#add-task&quot;).click(function(evt){
            add_task(document.getElementByID(&quot;task-text&quot;),evt);
            });
        });
    
    function add_task(textBox, evt){
      evt.preventDefault();
      var taskText = textBox.value;
      $(&quot;&lt;li&gt;&quot;).text(taskText).appendTo(&quot;#tasks&quot;);
      textBox.value = &quot;&quot;;
    };
When I add elements By hitting the return key, there&#39;s no problem.
But When I click the Submit Button then firebug shows this error

    document.getElementByID is not a function
    [Break On This Error] add_task(document.getElementByID(&quot;task-text&quot;),evt);
    task-list.js (line 11)

I tried to use jQuery instead replacing it with 

    $(&quot;#task-text&quot;)
This time the error is :

    $(&quot;&lt;li&gt;&quot;).text(taskText).appendTo is not a function
    [Break On This Error] $(&quot;&lt;li&gt;&quot;).text(taskText).appendTo(&quot;#tasks&quot;);
    task-list.js (line 18
    which results in the following error

I&#39;ve been trying to debug this for some time but i just don&#39;t get it. Its probably a really silly mistake that i&#39;ve made. Any help is most appreciated.

Edit :
I&#39;m using jQuery 1.6.1


document.getElementByID is not a function

This should be really simple but I&#39;m having trouble with it. How do I get a parent div of a child element?

My HTML:
&lt;!-- language: lang-html --&gt;

    &lt;div id=&quot;test&quot;&gt;
        &lt;p id=&quot;myParagraph&quot;&gt;Testing&lt;/p&gt;
    &lt;/div&gt;

My JavaScript:
&lt;!-- language: lang-js --&gt;

    var pDoc = document.getElementById(&quot;myParagraph&quot;);
    var parentDiv = ??????????   

I would have thought `document.parent` or `parent.container` would work but I keep getting `not defined` errors. Note that the `pDoc` is defined, just not certain variables of it.

Any ideas?

P.S. I would prefer to avoid jQuery if possible.

Getting the parent div of element

I have to use vanilla JavaScript for a project.  I have a few functions, one of which is a button that opens a menu.  It works on pages where the target id exists, but causes an error on pages where the id doesn&#39;t exist.  On those pages where the function cannot find the id, I receive a &quot;Cannot read property &#39;addEventListener&#39; of null &quot; error and none of my other functions work.

Below is the code for the button that opens the menu. 

    function swapper() {
    toggleClass(document.getElementById(&#39;overlay&#39;), &#39;open&#39;);
    }

    var el = document.getElementById(&#39;overlayBtn&#39;);
    el.addEventListener(&#39;click&#39;, swapper, false);

    var text = document.getElementById(&#39;overlayBtn&#39;);
    text.onclick = function(){
    this.innerHTML = (this.innerHTML === &quot;Menu&quot;) ? &quot;Close&quot; : &quot;Menu&quot;;
    return false;
    };

How do I deal with this? I probably need to all wrap this code in another function or use an if/else statement so that it only searches for the id on specific pages, but not sure exactly. 

Cannot read property &#39;addEventListener&#39; of null

Alright, I&#39;ve dabbled in JavaScript before, but the most useful thing I&#39;ve written is a CSS style-switcher. So I&#39;m somewhat new to this. Let&#39;s say I have HTML code like this:

    &lt;div id=&quot;foo&quot;&gt;
        &lt;div class=&quot;bar&quot;&gt;
            Hello world!
        &lt;/div&gt;
    &lt;/div&gt;

How would I change `Hello world!` to `Goodbye world!`?

I know how `document.getElementsByClassName` and `document.getElementById` work, but I would like to get more specific. Sorry if this has been asked before.

Get element inside element by class and ID - JavaScript

In our application, we parse a web page and load it into another page in an iframe. All the elements in that loaded page have their token IDs. I need to select the elements by those token IDs. Means - I click on an element on the main page and select corresponding element in the page in the iframe. With the help of jQuery I&#39;m doing it in the following way:

    function selectElement(token) {
         $(&#39;[tokenid=&#39; + token + &#39;]&#39;).addClass(&#39;border&#39;); 
    }

However with this function I can select the elements in the current page only, not in the iFrame. Could anybody tell me how can I select the elements in the loaded iFrame?

Thanks.

Selecting an element in iframe with jQuery

I need to get the ID of an element but the value is dynamic with only the beginning of it is the same always. 

Heres a snippet of the code.

    &lt;form class=&quot;form-poll&quot; id=&quot;poll-1225962377536&quot; action=&quot;/cs/Satellite&quot;&gt;

The ID always starts with `poll-` then the numbers are dynamic.

How can I get the ID using just JavaScript and not jQuery?

Javascript getElementById based on a partial string

I&#39;m trying to toggle the visibility of certain DIV elements on a website depending on the class of each DIV. I&#39;m using a basic JavaScript snippet to toggle them. The problem is that the script only uses `getElementById`, as `getElementByClass` is not supported in JavaScript. And unfortunately I do have to use class and not id to name the DIVs because the DIV names are dynamically generated by my XSLT stylesheet using certain category names.

I know that certain browsers now support `getElementByClass`, but since Internet Explorer doesn&#39;t I don&#39;t want to go that route.

I&#39;ve found scripts using functions to get elements by class (such as #8 on this page: http://www.dustindiaz.com/top-ten-javascript/), but I can&#39;t figure out how to integrate them with with my toggle script.

Here&#39;s the HTML code. The DIVs themselves are missing since they are generated on page load with XML/XSLT.

Main Question: How do I get the below Toggle script to get Element by Class instead of get Element by ID?

    &lt;html&gt;
    
    &lt;head&gt;
    
    &lt;!--This is the TOGGLE script--&gt;
    &lt;script type=&quot;text/javascript&quot;&gt;
    &lt;!--
        function toggle_visibility(id) {
           var e = document.getElementById(id);
           if(e.style.display == &#39;block&#39;)
              e.style.display = &#39;none&#39;;
           else
              e.style.display = &#39;block&#39;;
        }
    //--&gt;
    &lt;/script&gt;
    
    &lt;/head&gt;
    
    &lt;!--the XML/XSLT page contents will be loaded here, with DIVs named by Class separating dozens of li&#39;s--&gt;
    
    &lt;a href=&quot;#&quot; onclick=&quot;toggle_visibility(&#39;class1&#39;);&quot;&gt;Click here to toggle visibility of class 1 objects&lt;/a&gt;
    
    &lt;a href=&quot;#&quot; onclick=&quot;toggle_visibility(&#39;class2&#39;);&quot;&gt;Click here to toggle visibility of class 2 objects&lt;/a&gt;
    
    &lt;/body&gt;
    &lt;/html&gt;

How to getElementByClass instead of GetElementById with JavaScript?

I have a `iframe` like this

    &lt;iframe name=&quot;myframe1&quot; id=&quot;myframe1&quot; width=&quot;100%&quot; height=&quot;100%&quot; src=&quot;a.html&quot;&gt;
    &lt;html&gt;
    	&lt;head&gt;&lt;/head&gt;
    	&lt;frameset name=&quot;myframe2&quot; cols=&quot;0%, 100%&quot; border=&quot;0&quot; frameBorder=&quot;0&quot; frameSpacing=&quot;0&quot;&gt;
    		&lt;frame name=&quot;page1&quot; src=&quot;c.html&quot; scrolling=&quot;no&quot;&gt;&lt;/frame&gt;
    		&lt;frame name=&quot;page2&quot; src=&quot;d.html&quot; &gt;
    			&lt;html&gt;
    				&lt;head&gt;&lt;/head&gt;
    				&lt;body id=&quot;top&quot;&gt;
    					&lt;div id=&quot;div1&quot;&gt;
    						&lt;div id=&quot;div2&quot;&gt;
    							&lt;div id=&quot;div3&quot;&gt;
    								&lt;ul id=&quot;x&quot;&gt;
    									&lt;li&gt;a&lt;/li&gt;
    									&lt;li&gt;b&lt;/li&gt;
    								&lt;/ul&gt;
    							&lt;/div&gt;
    						&lt;/div&gt;
    					&lt;/div&gt;
    				&lt;/body&gt;
    			&lt;/html&gt;
    		
    		&lt;/frame&gt;
    		
    	&lt;/frameset&gt;
    &lt;/html&gt;
    &lt;/iframe&gt;

I want to refer to the element &quot;x&quot;. I tried in several ways but I couldn&#39;t find a solution. 

How to pick element inside iframe using document.getElementById

Working on an idea for a simple `HTMLElement` wrapper I stumbled upon the following for Internet&amp;nbsp;Explorer and [Chrome][1]:

For a given `HTMLElement` with an `id` in the DOM tree, it is possible to retrieve the `&lt;div&gt;` using its ID as a variable name or as a property of `window`. So for a `&lt;div&gt;` like

```html
&lt;div id=&quot;example&quot;&gt;some text&lt;/div&gt;
```

in [Internet&amp;nbsp;Explorer&amp;nbsp;8][2] and Chrome you can do:

```js
alert(example.innerHTML); // Alerts &quot;some text&quot;.
```

or

```js
alert(window[&quot;example&quot;].innerHTML); // Alerts &quot;some text&quot;.
```

So, does this mean *every element in the DOM tree* is converted to a property on the global object? And does it also mean one can use this as a replacement for the `getElementById` method in these browsers?


  [1]: http://en.wikipedia.org/wiki/Google_Chrome
  [2]: http://en.wikipedia.org/wiki/Internet_Explorer_8

Do DOM tree elements with IDs become global properties?

I would like to append an li element after another li inside a ul element using javascript, This is the code I have so far..

    var parentGuest = document.getElementById(&quot;one&quot;);
    var childGuest = document.createElement(&quot;li&quot;);
    childGuest.id = &quot;two&quot;;

I am familiar with appendChild,

    parentGuest.appendChild(childGuest);

However this appends the new element inside the other, and not after. How can I append the new element after the existing one? Thanks.

    &lt;ul&gt;
      &lt;li id=&quot;one&quot;&gt;&lt;!-- where the new li is being put --&gt;&lt;/li&gt;
      &lt;!-- where I want the new li --&gt;
    &lt;/ul&gt;

Javascript Append Child AFTER Element

I&#39;m trying to get the element with getElementById(), but it returns null even though the element exists. What am I doing wrong?

    &lt;html&gt;
	&lt;head&gt; 
		&lt;title&gt;blah&lt;/title&gt;
		&lt;script type=&quot;text/javascript&quot;&gt;
            alert(document.getElementById(&quot;abc&quot;));
		&lt;/script&gt;
	&lt;/head&gt; 
	&lt;body&gt;
		&lt;div id=&quot;abc&quot;&gt;

		&lt;/div&gt;
	&lt;/body&gt;
&lt;/html&gt;



getElementById() returns null even though the element exists

All browsers I&#39;ve come to work with allow accessing an element with `id=&quot;myDiv&quot;` by simply writing:

    myDiv

See here: http://jsfiddle.net/L91q54Lt/

Anyway, this method seems to be quite poorly documented, and in fact, the sources I come across don&#39;t even give it a mention and instead assume that one would use

    document.getElementById(&quot;myDiv&quot;)

or maybe

    document.querySelector(&quot;#myDiv&quot;)

to access a DOM element even when its ID is known in advance (i.e. not calculated at runtime). I can tell that the latter approaches have the advantage of keeping the code safe if someone inadvertedly attempts to redefine `myDiv` in a wider scope (not such a brilliant idea though...), overwrites it with some different value and goes on without noticing the clash.

But other that that? Are there any concerns in using the short form above other than code design, or what else am I missing here?


Why don&#39;t we just use element IDs as identifiers in JavaScript?

Does vue.js have a shorthand for `document.getElementById(&#39;#id&#39;)` like JQuery&#39;s `$(&#39;#id&#39;)`? 

If so, where is the reference for this in the docs so I can locate other information?


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