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| Code | ||||||||||
<HTML> <HEAD> </HEAD> <BODY> <? /***************************************************************/ /*Code: PHP3 */ /*Author: Leon Atkinson <leon@clearink.com> */ /*Creates two form fields based on data from a database */ /*Writes javascript that update field 2 based on field 1 */ /***************************************************************/ /* To simulate database connectivity, I'll fill some arrays */ $store_id = array( "1", "3", "4", "5", "6"); $store_state = array( "California", "California", "California", "Nevada", "Utah"); $store_city = array( "Los Angeles", "San Francisco", "Walnut Creek", "Las Vegas", "Salt Lake City"); $numStores = 5; $distinct_states = array( "California", "Nevada", "Utah"); /* create the javascript function the updates the city list */ echo "<SCRIPT Language=\"JavaScript\">\n"; echo "function UpdateCity()\n"; echo "{\n"; /* clear the city selector */ echo "\tvar City = document.choose_store.city.options.length;\n"; echo "\twhile(City > 0)\n"; echo "\t{\n"; echo "\t\tCity--;\n"; echo "\t\tdocument.choose_store.city.options[City].text = '';\n"; echo "\t\tdocument.choose_store.city.options[City].value = '';\n"; echo "\t}\n\n"; echo "\tdocument.choose_store.city.options[0].selected = true;\n\n"; /* figure out which state is selected*/ echo "\tvar StateSelected = 0;\n"; echo "\twhile(document.choose_store.state.options[StateSelected].selected==false) StateSelected++;\n\n"; $StoreState = ""; $CityCount = 0; /* If this weren't a demo, I'd run a query something like: */ /* select * from store order by State */ /* But since this is a demo, I'll just read from an array */ $RowCount = 0; while($RowCount < $numStores) { $store_ID = $store_id[$RowCount]; $store_State = $store_state[$RowCount]; $store_City = $store_city[$RowCount]; if($StoreState != $store_State) { if($StoreState != "") { echo "\t}\n"; } echo "\tif(document.choose_store.state.options[StateSelected].value == '$store_State')\n"; echo "\t{\n"; echo "\t\tdocument.choose_store.city.options[0].value = 0;\n"; echo "\t\tdocument.choose_store.city.options[0].text = 'Choose a Store Location';\n\n"; $StoreState = $store_State; $CityCount=1; } echo "\t\tdocument.choose_store.city.options[$CityCount].value = '$store_ID';\n"; echo "\t\tdocument.choose_store.city.options[$CityCount].text = '$store_City';\n\n"; $CityCount++; $RowCount++; } echo "\t}\n"; echo "}\n"; echo "</SCRIPT>\n\n"; echo "<CENTER><FORM NAME=choose_store>"; echo "<SELECT NAME=state onChange=\"UpdateCity();\">\n"; /* This is another place I'd put a query: */ /* select distinct State from store order by State */ echo "<OPTION VALUE=0>Choose a State"; $RowCount = 0; while($RowCount < count($distinct_states)) { echo "<OPTION VALUE=\""; echo $distinct_states[$RowCount]; echo "\">"; echo $distinct_states[$RowCount]; echo "\n"; $RowCount++; } echo "</SELECT>\n"; /* Now we need to know how many cities are listed for the state with the most stores */ /* select count(*) as items from store group by State order by items desc */ $MaxItems = 3; echo "<SELECT NAME=city>\n"; $RowCount = 0; while($RowCount <= $MaxItems) { echo "<OPTION VALUE=$RowCount>"; echo "Choose a Store Location\n"; $RowCount++; } echo "</SELECT><BR><BR>\n"; echo "</FORM></CENTER>"; echo "<SCRIPT Language=\"JavaScript\">UpdateCity();</SCRIPT>\n"; ?> <BR> <BR> <CENTER> Check out <A HREF="http://www.restorationhardware.com/secondary.htmy?id=location">www.RestorationHardware.com</A> to see this code used to take to a real database. </CENTER> </BODY> </HTML> | ||||||||||
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