Tryit Editor v2.3

Edit This Code:
<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; margin: 5px; } </style> </head> <body> <div id="myDIV"> <h2 class="example">A heading with class="example" in div</h2> <p class="example">A paragraph with class="example" in div.</p> <p class="example">Another paragraph with class="example" in div.</p> </div> <p>Click the button to find out how many elements with class "example" there are in DIV.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The querySelectorAll() method is not supported in Internet Explorer 8 and earlier versions.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myDIV").querySelectorAll(".example"); document.getElementById("demo").innerHTML = x.length; } </script> </body> <!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_queryselectorall_length by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 23 Jan 2015 08:28:55 GMT --> </html>
Result:
Try it Yourself - © w3schools.com