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[removed] setAttribute() v.s. element.attribute = value to set “name” attribute

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挽巷
挽巷 2020-12-03 11:07

So I\'m learning to manipulate the DOM and I noticed one interesting thing:

Let\'s say I want to set the name attribute of an element by using the \".\"

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  • 佛祖请我去吃肉
    2020-12-03 11:29 
    <head>
<script>
function test($count) {
document.getElementById("test1").setAttribute("name","file-upload_" + $count);
}
</script>
</head>
<body>

<p>some content</p>
<input id="test1" type="file" name="file-upload" id="file-upload" />
<p>some other content</p>
<script>test(1);</script>
</body>
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  • 南旧
    2020-12-03 11:39

    when you use, element.name, you are accessing the property/creating a property named "name" and setting its value.

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  • 臣服心动
    2020-12-03 11:41

    when you use, element.name, you are accessing the property/creating a property named "name" and setting its value.

    but,

    while using, element.setAttribute('name','someName'), you are actually setting the attribute 'name'.

    IE8 and below treats the property and attribute as same, the bug has been fixed in IE9 and above.
    Safari, FireFox, Chrome treat property and attribute differently.

    However, you can always create a new property of your choice if you wish to do so.

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  • 遥遥无期
    2020-12-03 11:42

    My guess (because you didn't specify the element type) is the element normally does not have a name attribute, so setting the DOM property like that won't work.

    For example, setting the name property on an input element will work. Setting it on a div will not.

    It will work, however, with setAttribute().

    jsFiddle.

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  • 孤街浪徒
    2020-12-03 11:44

    (Attempting to explain part of the above post a better, separately, since it is already went into -ve rating, and belief in that post will be less. Help improve this further if not better.)

    *** The property

    When you use, element.name, you are accessing an existing property named "name" or setting its value. 

    Example 1:
var div1 = document.getElementById("div1"); 
div1.textContent = "2";

    *** The attribute

    but, while using, element.setAttribute('name','someName'), you are actually setting the attribute named 'name'. This attribute can be an existing property OR a custom one we want:

    Example 2:
var h1 = document.getElementById("H1"); 
h1.setAttribute("class", "democlass");

Example 3:
var d = document.getElementById("d1"); 
d.setAttribute("name1", "value1");
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  • 孤独总比滥情好
    2020-12-03 11:46

    To extend the answers provided by some of the others ...

    The attribute 'name' is only considered valid DOM for a few specific objects. According to https://developer.mozilla.org/en-US/docs/DOM/element.name those objects are:

     <a>, <applet>, <button>, <form>, <frame>, <iframe>, <img>, <input>, 
 <map>, <meta>, <object>, <param>, <select>, and <textarea>

    For these objects you can set, get and change the name attribute using object.name BUT FOR ANY OTHER DOM OBJECT the attribute 'name' is a custom attribute and must be created using SetAttribute() or by adding it to the HTML declaration. Once it is created, you can acces it using setAttribute() and getAttribute() or you can refer to its value directly using object.attributes.name.value take a look at http://jsfiddle.net/radiotrib/yat72/1/ for an example. BTW - the alert box on load is intentional - check the code to see why ...

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