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859Chapter 31 .Positioned Objects defined in a document. You must know the way to San Jose if you want to get its lastModified property. Layers and forms Because each layer has its own document, you cannot spread a form across multiple layers. Each layer s document must define its own

tags. If you need to submit one form from content located in multiple layers, one of the forms should have an onSubmit event handler to harvest all the related form values and place them in hidden input fields in the document containing the submitted form. In this case, you need to know how to devise references from a nested layer outward. As a demonstration of reverse-direction references, I start with the following skeletal structure that contains multiple nested layers:

Each of the HTML files loaded into the layers also has a

tag defining some fields or select lists for relevant user choices, such as which specific model of the UltraGizmoline is selected, what color, and in what size. (These last two are defined as separate layers because their positions are animated when they are displayed.) The assumption here is that the Submit button is in the sendIt layer. That layer s document also includes hidden input fields for data to be pulled from the main document s form and three other layer forms. Two of those layers are at the same nested level as sendIt, one is above it, and the main document s form is at the highest level. To reach the value property of a field named theColor in the color layer, a script in the sendItlayer uses this reference: parentLayer.document.color.document.forms[0].theColor.value Analogous to working with frames, the reference starts with a reference to the next higher level (parentLayer) and then starts working its way down through the parent layer s document, the colorlayer, the color layer s document, and finally the form therein. To reach the value property of a field named modelNum in the productlayer, the reference starts the same way; but because the form is at the parent layer level, the reference goes immediately to that layer s document and form: parentLayer.document.forms[0].modelNum.value document.layerObject
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