JavaScript drop down listbox

List box or drop down list box is very common in forms used in web pages. We can give option to visitor to select from a list by clicking and selecting one ( or more ) out of a pre defined list. So the advantage is visitor can't give any choice of its own.

You can read more on basics of drop down list box with style property in our html section.

We can add many JavaScript controls to list boxes by various properties and methods. We will develop some scripts which use these controls and give desired output. We will start with some basic script and then develop complex ones.

getElementById to access form elements with event handlers

Javascript Form Validation

Period button Validation of a form

How to limit number of checkboxes allowed to be clicked inside a form

Checkbox Validation of a form

Displaying checked value of a check box array

Enable or disable of a text box by a checkbox

All Checking & Un checking in a group of checkboxes by single button

Adding options to a drop down list box

Removing options from a drop down list box

Moving options from one drop down list box to other

Dynamic population of second list box based on value of first list box

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