Button Onclick Javascript Code Example


Example 1: javascript onclick

document.getElementById("myBtn").addEventListener("click", function() {   alert("Hello World!"); });

Example 2: HTML button onclick

<!DOCTYPE html> <html>   <head>     <title>Title of the document</title>   </head>   <body>     <p>There is a hidden message for you. Click to see it.</p>     <button onclick="myFunction()">Click me!</button>     <p id="demo"></p>     <script>       function myFunction() {         document.getElementById("demo").innerHTML = "Hello Dear Visitor!</br> We are happy that you've chosen our website to learn programming languages. We're sure you'll become one of the best programmers in your country. Good luck to you!";       }     </script>   </body> </html>

Example 3: how to add onclick event in javascript

var element = document.getElementById("elem"); element.onclick = function(event) {   console.log(event); }

Example 4: run a function when a button has the onclick

<script> function myFunction() {   alert("ALERT THIS FUNCTION HAS RUNNED"); } </script> <button onclick="myFunction">click to run function</button>

Example 5: javascript onclick

document.getElementById("Save").onclick = function ()     {      alert("hello");      //validation code to see State field is mandatory.       }

Example 6: javascript button onclick

document.getElementById('button').onclick = function() {    alert("button was clicked"); };

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