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3 Example(s) of JavaScript indexOf function


Description :

JavaScript indexOf function will return index of specified searched string, it will return the position else it returns -1. See the code snippet:


JavaScript indexOf function Example - 1 
<!DOCTYPE html>
<html>
 <head>
    <title>Welcome to LearnKode - A code learning platform</title>
</head>
  <body>
<button onclick="findPosition()">Find the position of string</button>
<p id="sample"></p>
<script>
function findPosition() {
    var str = "Hello world, welcome to learnKode.";
    var n = str.indexOf("welcome");
    document.getElementById("sample").innerHTML = n;
}
</script>
      </body>
</html>
Try it » Download Example »

Output

Description :

Example of JavaScript indexOf function.


JavaScript indexOf function Example - 2 
<!DOCTYPE html>
<html>
 <head>
    <title>Welcome to LearnKode - A code learning platform</title>
</head>
  <body>
<button onclick="findPosition()">Find the position of character</button>
<p id="sample"></p>
<script>
function findPosition() {
    var str = "Hello world, welcome to the India.";
    var n = str.indexOf("e");
    document.getElementById("sample").innerHTML = n;
}
</script>
      </body>
</html>
Try it » Download Example »

Output

Description :

Example of JavaScript indexOf function with starting index. See the code snippet:


JavaScript indexOf function Example - 3 
<!DOCTYPE html>
<html>
 <head>
    <title>Welcome to LearnKode - A code learning platform</title>
</head>
  <body>
<button onclick="findPosition()">Find the position of character</button>
<p id="sample"></p>
<script>
function findPosition() {
    var str = "Hello world, welcome to the India.";
    var n = str.indexOf("e",5);
    document.getElementById("sample").innerHTML = n;
}
</script>
      </body>
</html>
Try it » Download Example »

Output