Difference between document.getElementsByName and document.getElementById in JavaScript
document.getElementById VS document.getElementsByName
In this blog post I will demonstrate frequently asked interview question, what is the difference between document.getElementsByName() and document.getElementById() in JavaScript with example.- getElementsByName gets elements by their name attribute, getElementById gets the element by its id attribute.
- There may be many elements on a page with the same name so in this case we use getElementsByName to get list of elements/array but there is (must) only be one element with a given id so in this case we use getelementbyid to get a single element.
JavaScript Example
 |
| document.getelementsbyname.value example |
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title> document.getElementById Vs document.getElementsByName </title>
<script type="text/javascript">
// function to get value by getelementbyid document
function GetById(){ document.getElementById("div1").innerHTML=document.getElementById("num").value;
}
// function to get value by document.getelementsbyname
function GetByName()
{
var nums= document.getElementsByName("number");
var result='';
for(var i=0; i<nums.length; i++)
{
result+=nums[i].value +"<br/>";
document.getElementById("div1").innerHTML= result;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" id="num" value="12345" />
<input type="text" name="number" value="number1" />
<input type="text" name="number" value="number2" />
<input type="text" name="number" value="number3" />
</div>
<br />
<div id="div1" style="border-style: solid; border-width: thin; border-color: inherit;
width: 625px; height: 100px;">
Div Section
</div>
<br />
<input type="button" onclick="GetById();" value="Get Element By Id" />
<input type="button" onclick="GetByName();" value="Get Element By Name" />
</form>
</body>
Difference between document.getElementsByName and document.getElementById in JavaScript
Reviewed by Ravi Kumar
on
11:52 AM
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Reviewed by Ravi Kumar
on
11:52 AM
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