What is the difference between id attribute and name attribute in html-HTML Tutorial-php.cn

What is the difference between id attribute and name attribute in html

青灯夜游

Release： 2018-12-26 16:12:14

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In HTML, both the id attribute and the name attribute provide identifiers to represent HTML element tags. So what's the difference between them? This article will give you a brief comparison of the id attribute and the name attribute, and introduce the difference between the id attribute and the name attribute. I hope it will be helpful to you.

What is the difference between id attribute and name attribute in html

The id attribute in html

We use the id attribute to identify a unique HTML element, you can Use as an anchor reference in a URL (a URL with the # sign), or as an ID selector in CSS to style that element. You can also use getElementById() in javascript to find elements through the id attribute value and then operate on the elements. Example:

<p id="p1">测试文本！测试文本！</p>
<p id="p2">测试文本！测试文本！</p>

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What is the difference between id attribute and name attribute in html

<script>
document.getElementById("p2").style.color="red";
</script>

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What is the difference between id attribute and name attribute in html

##The id attribute is universally compatible and valid for any element. And the value of the id attribute is case-sensitive, and each id value should be unique. Example:

<div id="demo">
	<div id="a">div标签，id值为a</div>
	<p id="A">p标签，id值为A</p>
</div>

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#a{ color: red;}
#A{ color: pink;}

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Rendering:

What is the difference between id attribute and name attribute in html

name attribute in html

The name attribute is also used to identify HTML elements, but it does not have a unique row. Its value can be reused, for example: radio button

<form action="" method="get"> 
	最喜欢水果？<br /><br /> 
	<label><input name="Fruit" type="radio" value="" />苹果 </label> <br /> 
	<label><input name="Fruit" type="radio" value="" />桃子 </label> <br /> 
	<label><input name="Fruit" type="radio" value="" />香蕉 </label> <br /> 
	<label><input name="Fruit" type="radio" value="" />梨 </label> <br /> 
	<label><input name="Fruit" type="radio" value="" />其它 </label> <br /> 
</form>

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Effect diagram:

What is the difference between id attribute and name attribute in html

As shown in the above example, the name attribute is often used in forms to submit information; it is only valid for label elements such as a, form, iframe, img, map, input, select, textarea, etc. .

The name attribute can be used in JavaScript to find elements using getElementsByName(); but it cannot be referenced in CSS or URLs. Example:

<script type="text/javascript">
function getElements()
  {
  var x=document.getElementsByName("myInput");
  alert(x.length);
  }
</script>


<input name="myInput" type="text" size="20" /><br />
<input name="myInput" type="text" size="20" /><br />
<input name="myInput" type="text" size="20" /><br />
<br />
<input type="button" onclick="getElements()" value="名为 &#39;myInput&#39; 的元素有多少个？" />

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Rendering:

What is the difference between id attribute and name attribute in html

Explanation:

It can be said that the ID belongs to one person ID number, and Name is the person's name. Both can exist at the same time, sharing the same namespace (the values of both can be the same).

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