very useful in guiding a user through a form. Using the disabled tag, you can switch on
and off elements in a form.
Here is a standard text field:
Now here it is again, disabled:
Try typing in the second box, and you'll see that you can't - it's been disabled.
You can do the same any other elements in a form - checkboxes, selection boxes and the rest.
Disabling Form Elements - Common Uses
One common use of this is to only enable the element, once the appropriate
field has been selected earlier in the form.
Now here's a practical example. The 'explain your choice' field only becomes enabled when I have selected the answer to Question 1.
Before selecting a radio button, try typing in the text field - you can't!
Disabling Form Elements - How it's done
To disable an element, put the phrase disabled="true" within the element tag.
Once you've set the disabled tag, you can enable it using something like the following code:
With disabled set to false, the form element becomes useable.
Check IsNumeric Function by Jeff Anderson
Sometimes you need to perform an action immediatley after the page has loaded. That's when the onLoad Event Handler comes in handy
Form Validation Function by Jeff Anderson
Multiple submit buttons on a single form by Kiran Pai
This script shows you how to submit the contents of a form to different programs depending on which Submit button you press. Additionally it also shows how to call two different functions when you press the Submit button.
Simple date validation by Chris Hogben
function that takes a date in three parts, day, month and year - returns true if it's a valid date.