File Under: JavaScript

JavaScript Event – Select

This code was written based on a template by John Resig. The original can be found at John Resig’s addEvent function website.

The code, and the template, are referred to in Webmonkey’s JavaScript Events reference page. In this example, the onSelect event fires when a field’s text is highlighted (selected).

The Code




// addEvent function by John Resig:


function addEvent( obj, type, fn ) {

  if ( obj.attachEvent ) {

    obj['e'+type+fn] = fn;

    obj[type+fn] = function(){obj['e'+type+fn]( window.event );}

    obj.attachEvent( 'on'+type, obj[type+fn] );

  } else

    obj.addEventListener( type, fn, false );





<!-- HTML for example event goes here -->

<input id="myinput" type="text" value="highlight this text" />


// Script for example event goes here

addEvent(document.getElementById('myinput'), 'select', function(event) {

	var txtbox =;

	var selectedText = txtbox.value.substr(txtbox.selectionStart, txtbox.selectionEnd - txtbox.selectionStart);

	alert('The user selected some text: ' + selectedText);





What it Looks Like