Introduction:
Some time we need to find the position
of the first occurrence of a specified value in given string. In this article I
will explain how to find position of the first occurrence of a specified value
using Javascript.
Description:
I have used “string.indexOf()”
method of JavaScript to find the position of the first occurrence of a
specified substring or value. The indexOf() method searches a string for a
specified value, and returns the the position of the first occurrence of a
specified substring or value. This method return -1 if no match is found.
In this article I have used
“label” control to show position of the first occurrence of a specified substring.
Just find the label control in javascript and itialize it with position value.
Following
script is used to get the position of the first occurrence of a specified
substring:
<script>
function
myFunction() {
var
str = "Search String for Text";
var n
= str. indexOf ("Text");
document.getElementById("demo").innerHTML = n;
}
</script>
|
HTML Code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script>
function
myFunction() {
var
str = "Search String for Text";
var n
= str. indexOf ("Text");
document.getElementById("demo").innerHTML = n;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<fieldset style="width:300px"><legend><strong>Search String For Text Using Jquery</strong></legend>
<div>
<br />
Given String: "Search String for
Text"
<br />
<br />
<input id="Button2" type="button" onclick='return myFunction()' value="Get Position Of 'Text'" />
<br />
<br />
Position Of "Text" in string
is: <label
id="demo"></label> <br />
</div></fieldset>
</form>
</body>
</html>
|
Demo:
