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8.7

Chained select box using Ajax, ColdFusion and DB

Asked by panosms in ColdFusion Application Server, Asynchronous Javascript and XML (AJAX)

Hello experts.
I have found a working solution on this page:http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/Cold_Fusion_Markup_Language/Q_23902796.html?sfQueryTermInfo=1+ajax+chain+coldfus+select
The question i have is how to make this work using a DB (MSSQL) with two tables parents and children and not a file getChildren.cfm like the example.
(
Below is the code 
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select.cfm:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
body{
	background-repeat:no-repeat;
	font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
	height:100%;
	background-color: #FFF;
	margin:0px;
	padding:0px;
}
select{
	width:150px;
}
</style>
<script type="text/javascript">
/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* ©2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
   see documentation or authors website for more details */
 
function sack(file) {
	this.xmlhttp = null;
 
	this.resetData = function() {
		this.method = "POST";
  		this.queryStringSeparator = "?";
		this.argumentSeparator = "&";
		this.URLString = "";
		this.encodeURIString = true;
  		this.execute = false;
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.vars = new Object();
		this.responseStatus = new Array(2);
  	};
 
	this.resetFunctions = function() {
  		this.onLoading = function() { };
  		this.onLoaded = function() { };
  		this.onInteractive = function() { };
  		this.onCompletion = function() { };
  		this.onError = function() { };
		this.onFail = function() { };
	};
 
	this.reset = function() {
		this.resetFunctions();
		this.resetData();
	};
 
	this.createAJAX = function() {
		try {
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) {
			try {
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
				this.xmlhttp = null;
			}
		}
 
		if (! this.xmlhttp) {
			if (typeof XMLHttpRequest != "undefined") {
				this.xmlhttp = new XMLHttpRequest();
			} else {
				this.failed = true;
			}
		}
	};
 
	this.setVar = function(name, value){
		this.vars[name] = Array(value, false);
	};
 
	this.encVar = function(name, value, returnvars) {
		if (true == returnvars) {
			return Array(encodeURIComponent(name), encodeURIComponent(value));
		} else {
			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
		}
	}
 
	this.processURLString = function(string, encode) {
		encoded = encodeURIComponent(this.argumentSeparator);
		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
		varArray = string.split(regexp);
		for (i = 0; i < varArray.length; i++){
			urlVars = varArray[i].split("=");
			if (true == encode){
				this.encVar(urlVars[0], urlVars[1]);
			} else {
				this.setVar(urlVars[0], urlVars[1]);
			}
		}
	}
 
	this.createURLString = function(urlstring) {
		if (this.encodeURIString && this.URLString.length) {
			this.processURLString(this.URLString, true);
		}
 
		if (urlstring) {
			if (this.URLString.length) {
				this.URLString += this.argumentSeparator + urlstring;
			} else {
				this.URLString = urlstring;
			}
		}
 
		// prevents caching of URLString
		this.setVar("rndval", new Date().getTime());
 
		urlstringtemp = new Array();
		for (key in this.vars) {
			if (false == this.vars[key][1] && true == this.encodeURIString) {
				encoded = this.encVar(key, this.vars[key][0], true);
				delete this.vars[key];
				this.vars[encoded[0]] = Array(encoded[1], true);
				key = encoded[0];
			}
 
			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
		}
		if (urlstring){
			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
		} else {
			this.URLString += urlstringtemp.join(this.argumentSeparator);
		}
	}
 
	this.runResponse = function() {
		eval(this.response);
	}
 
	this.runAJAX = function(urlstring) {
		if (this.failed) {
			this.onFail();
		} else {
			this.createURLString(urlstring);
			if (this.element) {
				this.elementObj = document.getElementById(this.element);
			}
			if (this.xmlhttp) {
				var self = this;
				if (this.method == "GET") {
					totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				} else {
					this.xmlhttp.open(this.method, this.requestFile, true);
					try {
						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
					} catch (e) { }
				}
 
				this.xmlhttp.onreadystatechange = function() {
					switch (self.xmlhttp.readyState) {
						case 1:
							self.onLoading();
							break;
						case 2:
							self.onLoaded();
							break;
 
						case 3:
							self.onInteractive();
							break;
						case 4:
							self.response = self.xmlhttp.responseText;
							self.responseXML = self.xmlhttp.responseXML;
							self.responseStatus[0] = self.xmlhttp.status;
							self.responseStatus[1] = self.xmlhttp.statusText;
 
							if (self.execute) {
								self.runResponse();
							}
 
							if (self.elementObj) {
								elemNodeName = self.elementObj.nodeName;
								elemNodeName.toLowerCase();
								if (elemNodeName == "input"
								|| elemNodeName == "select"
								|| elemNodeName == "option"
								|| elemNodeName == "textarea") {
									self.elementObj.value = self.response;
								} else {
									self.elementObj.innerHTML = self.response;
								}
							}
							if (self.responseStatus[0] == "200") {
								self.onCompletion();
							} else {
								self.onError();
							}
 
							self.URLString = "";
							break;
					}
				};
 
				this.xmlhttp.send(this.URLString);
			}
		}
	};
 
	this.reset();
	this.createAJAX();
}
 
</script>
<script type="text/javascript">
/************************************************************************************************************
Ajax chained select
Copyright (C) 2006  DTHMLGoodies.com, Alf Magne Kalleland
 
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
 
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
Dhtmlgoodies.com., hereby disclaims all copyright interest in this script
written by Alf Magne Kalleland.
 
Alf Magne Kalleland, 2006
Owner of DHTMLgoodies.com
 
 
************************************************************************************************************/	
var ajax = new Array();
 
function getChildrenList(sel)
        {
                var parentCode = sel.options[sel.selectedIndex].value;
                document.getElementById('dhtml_children').options.length = 0;   // Empty city select box
                if(parentCode.length>0){
                        var index = ajax.length;
                        ajax[index] = new sack();
                        ajax[index].requestFile = 'getChildren.cfm?parentCode='+parentCode;     // Specifying which file to get
                        ajax[index].onCompletion = function(){ createChildren(index) }; // Specify function that will be executed after file has been found
                        ajax[index].runAJAX();          // Execute AJAX function
                }
        }
        
        function createChildren(index)
        {
                var obj = document.getElementById('dhtml_children');
                eval(ajax[index].response);     // Executing the response from Ajax as Javascript code  
        }	
</script>
 
</head>
 
<body>
<form action="" method="post">
<table>
        <tr>
                <td>Parent: </td>
                <td><select id="dhtml_parents" name="dhtml_parents" onchange="getChildrenList(this)">
                        <option value="">Select a parent item</option>
                        <option value="p1">Parent 1</option>
                        <option value="p2">Parent 2</option>
                        <option value="p3">Parent 3</option>
                </select>
                </td>
        </tr>
        <tr>
                <td>Children: </td>
                <td>
                <select id="dhtml_children" name="dhtml_children">
                
                        </select>
                </td>
        </tr>
</table>
</form>
 
</body>
</html>
 
getChildren.cfm:
<cfswitch expression="#parentCode#">
        <cfcase value="p1">     
          obj.options[obj.options.length] = new Option('Child 1','1');
          obj.options[obj.options.length] = new Option('Child 2','2');
          obj.options[obj.options.length] = new Option('Child 3','3');
          obj.options[obj.options.length] = new Option('Child 4','4');
                </cfcase>
                
        <cfcase value="p2">  
          obj.options[obj.options.length] = new Option('Child 5','11');
          obj.options[obj.options.length] = new Option('Child 6','12');
          obj.options[obj.options.length] = new Option('Child 7','13');     
                </cfcase>
                
        <cfcase value="p3">  
          obj.options[obj.options.length] = new Option('Child 8','21');
          obj.options[obj.options.length] = new Option('Child 9','22');
          obj.options[obj.options.length] = new Option('Child 10','23');
          obj.options[obj.options.length] = new Option('Child 11','24');
          obj.options[obj.options.length] = new Option('Child 12','25');
          obj.options[obj.options.length] = new Option('Child 13','26');
          obj.options[obj.options.length] = new Option('Child 14','27');
                </cfcase>
                
    <cfdefaultcase>
       
    </cfdefaultcase>
</cfswitch>
 
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Zones: ColdFusion Application Server, Asynchronous Javascript and XML (AJAX)
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Solution Provided By: DADITWebGroup
Participating Experts: 2
Solution Grade: A
 
 
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