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Articles
Useful Scripts

Chapter 7: Form Handling

Contents:

Select-and-Go Navigation
Changing Menus Dynamically
Making Fields Required
Checking Fields against Each Other
Identifying Problem Fields
Putting Form Validation into Action
Working with Radio Buttons
Setting One Field with Another
Validating Zip Codes
Validating Email Addresses

Return to Chapter 7

To use this script on your own page, click in the text area below, select all, and copy to grab the script. Then, just paste into your own page — and you're done.

Checking Fields against Each Other

See it run: Checking Fields against Each Other

Script 7.8

This JavaScript compares the value of one field to another, and figures out if they match.

window.onload = initForms;

function initForms() {
	for (var i=0; i< document.forms.length; i++) {
		document.forms[i].onsubmit = function() {return validForm();}
	}
}

function validForm() {
	var allGood = true;
	var allTags = document.getElementsByTagName("*");

for (var i=0; i<allTags.length; i++) {
		if (!validTag(allTags[i])) {
			allGood = false;
		}
	}
	return allGood;

function validTag(thisTag) {
		var outClass = "";
		var allClasses = thisTag.className.split(" ");
	
		for (var j=0; j<allClasses.length; j++) {
			outClass += validBasedOnClass(allClasses[j]) + " ";
		}
	
		thisTag.className = outClass;
	
		if (outClass.indexOf("invalid") > -1) {
			thisTag.focus();
			if (thisTag.nodeName == "INPUT") {
				thisTag.select();
			}
			return false;
		}
		return true;
		
		function validBasedOnClass(thisClass) {
			var classBack = "";
		
			switch(thisClass) {
				case "":
				case "invalid":
					break;
				case "reqd":
					if (allGood && thisTag.value == "") classBack = "invalid ";
					classBack += thisClass;
					break;
				default:
					if (allGood && !crossCheck(thisTag,thisClass)) classBack = "invalid ";
					classBack += thisClass;
			}
			return classBack;
		}
				
		function crossCheck(inTag,otherFieldID) {
			if (!document.getElementById(otherFieldID)) return false;
			return (inTag.value == document.getElementById(otherFieldID).value);
		}
	}
}