Usefull JavaScripts

[JavaScriptBank]

JavaScript Collector​

Factors

Use JavaScript to find out if a number entered is odd or even and the factors of that number.... detail

Demo: Factors​

How to setup

Step 1: Use JavaScript code below to setup the script
JavaScript

<SCRIPT LANGUAGE="JavaScript">
//Nicholas John Sullivan (nicholasjohnsullivan@hotmail.com)
<!-- Begin
function calc() {
var dnum = ((eval(document.res.inpa.value)) / 2);
var i;
var pol;
var inum = (Math.round(dnum));
if (inum == dnum) {
document.res.rses.value="Number: " + (eval(document.res.inpa.value)) + " is Even\n\n";
}
else {
document.res.rses.value="Number: " + (eval(document.res.inpa.value)) + " is Odd\n\n";
}
document.res.rses.value += "Factors Are:\n\n";
var num = Math.round(eval(document.res.inpa.value));
for (i = 2; i < (num / 2); i++) {
var chkd = Math.round(num / i);
var inn = Math.round(num / i);
var outt = (num / i);
if (inn == outt && chkd > i) {
document.res.rses.value = document.res.rses.value + "(" + (num/i) + "," + i + ")";
      }
   }
}
function numbersonly() {
if (event.keyCode < 48 || event.keyCode > 57) return false;
}
//  End -->
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

Step 2: Place HTML below in your BODY section
HTML

<form name="res">
<input type=text value="0" name="inpa" onkeypress="return numbersonly()">
<input type=button name="bt1" value="Calculate" onClick="calc()">
<br>
Results
<br>
<textarea name="rses" cols="20" rows="10" value="nothing"></textarea>
</form>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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[Hanratty]

Developers and designers are using more and more JavaScript in modern designs. Sometimes this can be a hindrance to the user and take away from the simplicity of the design, and other times it can add greatly to the user’s experience. The key is a) adding the right amount of JavaScript, and b) using the right JavaScript techniques. We have already collected various JavaScript techniques in the past – now it’s time for a new portion of JavaScript.

Thanks to the Web’s widespread adoption of JavaScript, JavaScript libraries have sprung up to help make design and development easier. Here are a few of the major JavaScript libraries that developers use: jQuery, Prototype, Scriptaculous, mootools, Dojo. These frameworks have thriving communities whose members have developed countless plug-ins that can greatly add to the JavaScript framework.