Basic Validation - JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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JavaScript Basics

Inserting Javascript

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Advance DHTML Tutorial


Basic Validation

The simplest way to require visitors to fill out certain fields is to us this script - just add the word "required" to each required field's name and your visitor must fill it out to submit the form! Neat!


Insert into <HEAD>
<SCRIPT LANGUAGE="JavaScript"> <!-- Original: wsabstract.com --> <!-- This script and many more are available free online at --> <!-- The JavaScript Source!! http://javascript.internet.com --> <!-- Begin function checkrequired(which) { var pass=true; if (document.images) { for (i=0;i<which.length;i++) { var tempobj=which.elements[i]; if (tempobj.name.substring(0,8)=="required") { if (((tempobj.type=="text"\|\|tempobj.type=="textarea")&& tempobj.value=='')\|\|(tempobj.type.toString().charAt(0)=="s"&& tempobj.selectedIndex==0)) { pass=false; break; } } } } if (!pass) { shortFieldName=tempobj.name.substring(8,30).toUpperCase(); alert("Please make sure the "+shortFieldName+" field was properly completed."); return false; } else return true; } // End --> </script>

Insert into <BODY>
<center> <form onSubmit="return checkrequired(this)"> <input type="text" name="requiredname"> <br> <input type="text" name="requiredemail"> <br> <select name="requiredhobby"> <option selected>Pick an option! <option>1 <option>2 <option>3 </select> <br> <textarea name="requiredcomments"></textarea> <br> <input type=submit value="Submit"> </form> </center>

Other Options