JavaScript Examples Bible - UserWorks Technologies

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FORM.elements
JavaScript Examples Bible: The Essential Companion to JavaScript Bible
✦ While batch form validations are shown in several places throughout the
JavaScript Bible, Listing 23-4 demonstrates how both the onReset and
onSubmit event handlers, in concert with the window.confirm() method, let
scripts permit or prevent a form from being reset or submitted.
FORM Object
Properties
action
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Example
The following statement assigns a mailto: URL to the first form of a page:
document.forms[0].action = “mailto:jdoe@giantco.com”
elements
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Compatibility ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Example
The document in Listing 23-2 demonstrates a practical use of the elements
property. A form contains four fields and some other elements mixed in between
(see Figure 7-1). The first part of the function that acts on these items repeats
through all the elements in the form to find out which ones are text box objects and
which text box objects are empty. Notice how I use the type property to separate
text box objects from the rest, even when radio buttons appear amid the fields. If
one field has nothing in it, I alert the user and use that same index value to place
the insertion point at the field with the field’s focus() method.