Javascript XML calls made linked drop-down box Author: Unknown Source Technology: Unknown Hits: 59 Updated: 2004-12-18
Author: He Yao Thursday, June 5 2003 2:44 PM traditional HTML pages linked drop-down box using two methods: 1) content directly to the drop-down box hardcode javascript html, call the javascript function written in circulation Down-pull box. This method is not suitable for the case where the pull-down box content is often changed. Because the data source and the JavaScript program are written on the same page.
list </ title> <meta http-equiv = "content-type" content = "text / html; charSet = GB2312> <script language =" javascript "> <! - var OneCount; OneCount = 0; Subcat = New Array (); Subcat [0] = New Array ("Xuhui District", "01", "001"); SUBCAT [1] = New Array ("Jiading District", "01 "," 002 "); Subcat [2] = New Array (" Huangpu District "," 01 "," 003 "); SUBCAT [3] = New Array (" Nanchang City "," 02 "," 004 ") Subcat [4] = New Array ("Jiujiang", "02", "005"); SUBCAT [5] = New Array ("Shangrao City", "02", "006"); OneCount = 6; function Changelocation (location ID) {document.myform.smallLocation.Length = 0; var locationid = locationId; var i; document.myform.smAllLocation.Options [0] = new option ('==== All regions ====', '); for (i = 0; i <onecount; i ) {if (Subcat [i] [1] == locationID) {document.myform.smAllLocation.Options [document.myform.smAllLocation.Length] = new option (SUBCAT [I] [0], Subcat [i] [2]);}}} // -> </ script> </ head> <body> <form name = "myform" method = "post"> <select name = "BigLocation" onchange = "ChangeLocation (Document.myform.BigLocation.Options [document.myform.bigLocation.selected">> <Optio n value = "01" SELECTED> Shanghai </ option> <option value = "02"> Jiangxi </ option> </ select> <select name = "smallLocation> <option selected value ="> == all regions == </ option> </ select> </ form> <script language = "</p>
<p>JavaScript "> <! - changelocation (document.myform.biglocation.Option.SELECTEDINDEX] .Value); // -> </ script> </ body> </ html> 2) JavaScript Direct Read the database, use the record in the database to write JavaScript, then call the JavaScript function loop write to the drop-down box as in the first method. This method separates the data source with JavaScript, but the connection of the database, from security Angle, there is no practical value. My method is to place the data in the drop-down box in the XML file, read the XML file with JavaScript, and get the content in the dropboard.</p>
<p>The HTML file is as follows: <! - myfile.html -> <html> <head> <script language = "javaScript" for = "window" Event = "onload"> var xmldoc = new activXObject ("Microsoft.xmldom") ; VAR i = 0; var subclass_name = ""; loading loadXML () {xmldoc.async = "false"; xmldoc.Load ("account.xml"); xmlobj = xmldoc.documentelement Nodes = xmldoc.documentelement.childNodes; document.frm.mainclass.Options.Length = 0; Document.Frm.Subclass.Options.Length = 0; for (i = 0; i <xmlobj.childNods.Length; i ) { labels = xmlObj.childNodes (i) .getAttribute ( "display_name"); values = xmlObj.childNodes (i) .text; document.frm.mainclass.add (document.createElement ( "OPTION")); document.frm.mainclass .Options [i] .text = labels; Document.frm.mainclass.Options [i] .value = value;}} </ script> <script language = "javascript"> var xmldoc = new activXObject ("Microsoft.xmldom" VAR i = 0; var j = 0; function deleteoption () {} function setsubclass (main) {var is_selected = "n"; if (Document.Frm.Subclass.Options.Length! = 0) {for (i = 0; I <= document.frm.subclass.Options.Length; i ) document.frm.subclass.Options [i] = null;} // Repeat valid if (Document.Frm.Subclass.Options.Length! = 0) {for (i = 0; i <= Document.frm . Subclass.Options.Length; i ) {document.frm.subclass.Options [i] = null; document.frm.subclass.Options.Remove (i);}} for (i = 0; i <xmlobj.childnodes). Length; i ) {var values = "; var lables =" "; if (is_selected ==" y ") Return; labels = XMlobj.childNodes (i) .GetaTribute (" Display_name ");</p>
<p>VALUES = XMlobj.childNodes (i) .text; // alert (labels "| main); if (labels == main) {is_selected =" y "; for (j = 0; j <xmlobj.childNodes (i ) .childNodes.length; j ) {// subclass_name = "document.frm.subclass"; labels = xmlObj.childNodes (i) .childNodes (j) .getAttribute ( "display_name"); values = xmlObj.childNodes (i) .childNodes (j); document.frm.subclass.add (document.createElement ("option")); Document.frm.Subclass.Options [j] .text = labels; document. FRM.SUBCLASS.OPTIONS [J] .Value = VALUES1;}}}} </ script> <title> Tune XML data in HTML </ title> </ head> <body bgcolor = "# ffffff"> <form name = "frM"> type <select name = "mainclass" onchange = 'setsubclass (this [selectedindex] .text)'> </ select> <option selected value = "> </ option> subclass <select name =" Subclass "> </ select> </ form> </ body> </ html> Account.xml as follows: <? XML Version =" 1.0 "encoding =" GB2312 "?> <item> <class display_name =" Unselected "> <subclass display_name ="> not available </ subclass> </ class> <class display_name = "95788 call card"> <subclass display_name = "115206958-1152069638> DANGDANG1 </ subclass> < subclass display_name = "1152081031-1152081080"> dangdang2 </ subclass> <subclass display_name = "1152547201-1105254750"> dangdang3 </ subclass> <subclass display_name = "1152548401-1152548700"> dangdang4 </ subclass> <subclass display_name = "1152548701 -1152549000> Dangdang5 <</p></div><div class="text-center mt-3 text-grey">
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