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714Part IVConnectionsPassing data back to PHP from JavaScriptFinally, we close the data loop by passing form values back to PHP with JavaScript. Listings38-5, 38-6, and 38-7 use JavaScript to force at least one check box to be checked at all times. Inaddition, it passes an array to a PHP script. We ve chosen to use frames here to maximize thespeed of the changes, and we wrote all values out by hand for clarity, rather than assemblingthem dynamically from a data source. Listing 38-5: Frameset (sandwich_frames.html) Listing 38-6:Form page (sandwichorder.html)
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711Chapter 38PHP and JavaScript} function jmp(form, elt) { // The first parameter is a reference to the form. if (form != null) { with (form.elements[elt]) { if (0 <= selectedIndex) location = options[selectedIndex].value; } } } var catsIndex = -1; var itemsIndex; if (v) { // ns 2 fixfunction newCat(){ catsIndex++; a[catsIndex] = new Array(); itemsIndex = 0; } // Andrew chose to name this function O , presumably standing// for Option . It s not a zero, here or in the array below! function O(txt,url) { a[catsIndex][itemsIndex]=new myOptions(txt,url); itemsIndex++; } function myOptions(text,value){ this.text = text; this.value = value; } // fill arrayIf you are looking for affordable and reliable webhost to host and run your business application visit our ftp web hosting services.

710Part IVConnectionsListing 38-4(continued) //–>