Free Useful Javascripts

Altering CSS Class Attributes with JavaScript

Posted by Shawn Olson on Jan 8, 2004 | Last Updated Nov 3, 2011

A useful JavaScript to instantly change the style values of a CSS class property.

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Change HTML Styles with JavaScript

Posted by Shawn Olson on Jul 23, 2009 | Last Updated Aug 4, 2009

Video and source files on using getElementById, getElementsByTagName and object oriented methods to dynamically change HTML element styles in JavaScript.

javascript, getElemebtById, getElementsByTagName, reference, explanation, video

Select Some Checkboxes JavaScript Function

Posted by Shawn Olson on Jul 24, 2006 | Last Updated Nov 10, 2011

A new javascript function that allows you to control checkboxes in groups via a control checkbox.

checkbox control, javascript, advanced

Select All Checkboxes in a Form with JavaScript

Posted by Shawn Olson on Apr 20, 2004 | Last Updated Nov 5, 2011

A simple, free javascript to select/unselect all the checkboxes in a form.

checkbox select javascript, checkboxes

Get a Form Element's Label with JavaScript

Posted by Shawn Olson on Jul 7, 2009 | Last Updated Nov 12, 2011

This JavaScript finds the label for a form element, which is helpful for dynamically highlighting or changing a label based on user input.

Select Radio Inputs JavaScript

Posted by Shawn Olson on Aug 16, 2007 | Last Updated Nov 11, 2011

A free javascript function to choose radio inputs with a given value.

javascript, radio, input, radios, inputs, form, forms, free, smo_selectRadioValues()

UseMaps Crash IE When Changed

Posted by Shawn Olson on Mar 30, 2008 | Last Updated Nov 12, 2011

Dynamically changing an image's usemap property can cause Internet Explorer to crash completely. Here is a solution to changing usemaps with JavaScript.

image maps, usemaps, use maps, dynamic, ie7, ie, internet explorer, javascript

Hide Select Menus JavaScript

Posted by Shawn Olson on Nov 7, 2005 | Last Updated Nov 9, 2011

Sometimes it is beneficial to hide select menus with JavaScript, especially on Internet Explorer 6 and older.

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Manipulating Element Styles Based on CSS Classes Using Prototype

Posted by Shawn Olson on Dec 3, 2009 | Last Updated Dec 21, 2012

Example javascript function to change element display properties based on their classes using the Prototype JavaScript Framework.

javascript, prototype, css, class, className, classNames, style

Compare Values with Arbitrary Comparison Operator

JavaScript for comparing values when the operator to use is variable.

Posted by Shawn Olson on Dec 21, 2012 | Last Updated Dec 21, 2012

JavaScript function and sample code to dynamically compare two values. Accepts numeric and/or alphanumeric values and does a comparison on them based on a comparison parameter.

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