JavaScript - Triple Combo Box And Selected Values

<script language="JavaScript">
<!--

//Double Combo Box with Description Code- by Randall Wald (http://www.rwald.com)
//Visit JavaScript Kit (http://javascriptkit.com) for script
//Credit must stay intact for use

var num_of_cats = 4; // This is the number of categories, including the first, blank, category.
var open_in_newwindow=1; //Set 1 to open links in new window, 0 for no.
var option_array = new Array(num_of_cats);

option_array[0] = new Array("You need to select a category"); // This is the first (blank) category. Don't mess with it.

option_array[1] = new Array("-- Select One --",
"JavaScript Kit",
"News.com",
"Wired");

option_array[2] = new Array("-- Select One --",
"CNN",
"ABC News");

option_array[3] = new Array("-- Select One --",
"Google",
"Ask Jeeves");

var text_array = new Array(num_of_cats);

text_array[0] = new Array("Here's how you use this box: First, you select a category in the Category drop-down. Then, select a link from the Link drop-down. Then, read the description in this box, or click Go to go to the page. If you ever need to see this help again, just go back to the top option in the Category box."); // These are general instructions. Change them if you want, or keep them if you don't.

text_array[1] = new Array("These are some of my favorite technology sites. You should visit them.", // Note that the first entry here is a general description of this category. After than, they're descriptions of each link. Make sure that you don't put the first link first; the general description must be first.
"This is a page with a bunch of nice JavaScripts that you can use. They also have tutorials in all sorts of subjects.",
"CNet news. If it's in technology, it's in here.",
"Wired magazine is the type of magazine which needs no introduction.");

text_array[2] = new Array("These days, it's important to keep up on the news. These sites will help you do that.",
"CNN. What list of news sites would be complete without it?",
"Here, you can get links to World News Tonight, or see video clips.");

text_array[3] = new Array("If you can't find it via other means, you'll need to find it with a search engine. These are some of the best.",
"Undoubtedly, the best search engine out there.",
"Their natural-language search sometimes comes up with results you won't get with other engines.");

var url_array = new Array(num_of_cats);

url_array[0] = new Array("#"); // The first category. This should have no items other than "#".

url_array[1] = new Array("#", // The second category; the first "real" category. Note the initial #. That is the category which says "Please select a link." It doesn't need a URL. Start putting the other URL's in after that first line.
"http://javascriptkit.com/",
"http://www.news.com/",
"http://www.wired.com/");

url_array[2] = new Array("#",
"http://www.cnn.com/",
"http://abcnews.go.com/");

url_array[3] = new Array("#",
"http://www.google.com/",
"http://www.aj.com/");

function switch_select()

{
  for (loop = window.document.form_1.select_2.options.length-1; loop > 0; loop--)
  {
    window.document.form_1.select_2.options[loop] = null;
  }
  
  for (loop = 0; loop < option_array[window.document.form_1.select_1.selectedIndex].length; loop++)
  {
    window.document.form_1.select_2.options[loop] = new Option(option_array[window.document.form_1.select_1.selectedIndex][loop]);
  }
  
  window.document.form_1.select_2.selectedIndex = 0;
}
  
function switch_text()

{
  window.document.form_1.textarea_1.value = text_array[window.document.form_1.select_1.selectedIndex][window.document.form_1.select_2.selectedIndex];
}

function box()

{
  if (window.document.form_1.select_2.selectedIndex == 0)
  {
    alert("Where do you think you're going?");
  } else {
    if (open_in_newwindow==1)
    window.open(url_array[window.document.form_1.select_1.selectedIndex][window.document.form_1.select_2.selectedIndex],"_blank");
    else
    window.location=url_array[window.document.form_1.select_1.selectedIndex][window.document.form_1.select_2.selectedIndex]
  }
}

function set_orig()

{
  window.document.form_1.select_1.selectedIndex = 0;
  window.document.form_1.select_2.selectedIndex = 0;
}

window.onload=set_orig

// -->
</script>

<form name="form_1" onSubmit="return false;">
  <textarea WRAP="virtual" name="textarea_1" rows=6 cols=60>Here's how you use this box: First, you select a category in the Category drop-down. Then, select a link from the Link drop-down. Then, read the description in this box, or click Go to go to the page. If you ever need to see this help again, just go back to the top option in the Category box.</textarea><br /> <!-- This should be the same as the general instructions in the above code. -->
  <select name="select_1" onChange="switch_select(); switch_text();">
    <option>-- Categories --</option>
    <option>Technology Sites</option>
    <option>News Sites</option>
    <option>Search Engines</option>
  </select>
  <select name="select_2" onChange="switch_text();">
    <option>You need to select a category</option>
    <option> </option>
    <option> </option>
  </select>
  <input type="submit" onClick="box();" value="Go!">
</form>

<p align="center">This free script provided by<br />
<a href="http://javascriptkit.com">JavaScript
Kit</a></p>

var categories = [];
categories["startList"] = ["Wearing Apparel","Books"]
categories["Wearing Apparel"] = ["Men","Women","Children"];
categories["Books"] = ["Biography","Fiction","Nonfiction"];
categories["Men"] = ["Shirts","Ties","Belts","Hats"];
categories["Women"] = ["Blouses","Skirts","Scarves", "Hats"];
categories["Children"] = ["Shorts", "Socks", "Coats", "Nightwear"];
categories["Biography"] = ["Contemporay","Historical","Other"];
categories["Fiction"] = ["Science Fiction","Romance", "Thrillers", "Crime"];
categories["Nonfiction"] = ["How-To","Travel","Cookbooks", "Old Churches"];

var nLists = 3; // number of select lists in the set

function fillSelect(currCat,currList){
  var step = Number(currList.name.replace(/\D/g,""));
  for (i=step; i<nLists+1; i++) {
    document.forms['tripleplay']['List'+i].length = 1;
    document.forms['tripleplay']['List'+i].selectedIndex = 0;
  }
  var nCat = categories[currCat];
  for (each in nCat) {
    var nOption = document.createElement('option'); 
    var nData = document.createTextNode(nCat[each]); 
    nOption.setAttribute('value',nCat[each]); 
    nOption.appendChild(nData); 
    currList.appendChild(nOption); 
  } 
}

function getValue(L3, L2, L1) {
  alert("Your selection was:- \n" + L1 + "\n" + L2 + "\n" + L3);
}

function init() {
  fillSelect('startList',document.forms['tripleplay']['List1'])
}

navigator.appName == "Microsoft Internet Explorer" ? attachEvent('onload', init, false) : addEventListener('load', init, false); 

</script>

<div id="menuSearch">
 <form name="tripleplay" action="">
  <p><select name='List1' onchange="fillSelect(this.value,this.form['List2'])">
   <option selected>-- Topic of Interest --</option>
  </select></p>

  <p><select name='List2' onchange="fillSelect(this.value,this.form['List3'])">
   <option selected>-- Geographic Area --</option>
  </select></p>
  <select id="info"name='List3' onchange="getValue(this.value, this.form['List2'].value, this.form['List1'].value)">
   <option selected >-- Information Type --</option>
  </select>
 </form>
</div>

<div id="modelingCV">list of publications</div>
<div id="groundwaterCV">list of publications</div>
<div id="subsidenceCV">list of publications</div>
<div id="managementCV">list of publications</div>
<div id="qualityCV">list of publications</div>
<div id="wildlifeCV">list of publications</div>

<!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>
<script type="text/javascript">
 // first combo box

	data_1 = new Option("1", "$");
	data_2 = new Option("2", "$$");

// second combo box

	data_1_1 = new Option("11", "-");
	data_1_2 = new Option("12", "-");
	data_2_1 = new Option("21", "--");
	data_2_2 = new Option("22", "--");
	data_2_3 = new Option("23", "--");
	data_2_4 = new Option("24", "--");
	data_2_5 = new Option("25", "--");

// third combo box

	data_1_1_1 = new Option("111", "1");
	data_1_1_2 = new Option("112", "2");
	data_1_1_3 = new Option("113", "3");
	data_1_2_1 = new Option("121", "4");
	data_1_2_2 = new Option("122", "5");
	data_1_2_3 = new Option("123", "6");
	data_1_2_4 = new Option("124", "7");
	data_2_1_1 = new Option("211", "8");
	data_2_1_2 = new Option("212", "9");
	data_2_2_1 = new Option("221", "10");
	data_2_2_2 = new Option("222", "11");
	data_2_3_1 = new Option("231", "12");
	data_2_3_2 = new Option("232", "13");



// other parameters

    displaywhenempty=""
    valuewhenempty=-1

    displaywhennotempty="-select-"
    valuewhennotempty=0


function change(currentbox) {
	numb = currentbox.id.split("_");
	currentbox = numb[1];

    i=parseInt(currentbox)+1

// I empty all combo boxes following the current one

    while ((eval("typeof(document.getElementById(\"combo_"+i+"\"))!='undefined'")) &&
           (document.getElementById("combo_"+i)!=null)) {
         son = document.getElementById("combo_"+i);
	     // I empty all options except the first one (it isn't allowed)
	     for (m=son.options.length-1;m>0;m--) son.options[m]=null;
	     // I reset the first option
	     son.options[0]=new Option(displaywhenempty,valuewhenempty)
	     i=i+1
    }


// now I create the string with the "base" name ("stringa"), ie. "data_1_0"
// to which I'll add _0,_1,_2,_3 etc to obtain the name of the combo box to fill

    stringa='data'
    i=0
    while ((eval("typeof(document.getElementById(\"combo_"+i+"\"))!='undefined'")) &&
           (document.getElementById("combo_"+i)!=null)) {
           eval("stringa=stringa+'_'+document.getElementById(\"combo_"+i+"\").selectedIndex")
           if (i==currentbox) break;
           i=i+1
    }


// filling the "son" combo (if exists)

    following=parseInt(currentbox)+1

    if ((eval("typeof(document.getElementById(\"combo_"+following+"\"))!='undefined'")) &&
       (document.getElementById("combo_"+following)!=null)) {
       son = document.getElementById("combo_"+following);
       stringa=stringa+"_"
       i=0
       while ((eval("typeof("+stringa+i+")!='undefined'")) || (i==0)) {

       // if there are no options, I empty the first option of the "son" combo
	   // otherwise I put "-select-" in it

	   	  if ((i==0) && eval("typeof("+stringa+"0)=='undefined'"))
	   	      if (eval("typeof("+stringa+"1)=='undefined'"))
	   	         eval("son.options[0]=new Option(displaywhenempty,valuewhenempty)")
	   	      else
	             eval("son.options[0]=new Option(displaywhennotempty,valuewhennotempty)")
	      else
              eval("son.options["+i+"]=new Option("+stringa+i+".text,"+stringa+i+".value)")
	      i=i+1
	   }
       //son.focus()
       i=1
       combostatus=''
       cstatus=stringa.split("_")
       while (cstatus[i]!=null) {
          combostatus=combostatus+cstatus[i]
          i=i+1
          }
       return combostatus;
    }
}

//-->
</script>

</head>

<body>


<form>
<select name="combo0" id="combo_0" onChange="change(this);" style="width:200px;">
	<option value="value1">-select-</option>
	<option value="value2">1</option>
	<option value="value3">2</option>

</select>
<BR><BR>
<select name="combo1" id="combo_1" onChange="change(this)" style="width:200px;">
	<option value="value1">  </option>
</select>
<BR><BR>
<select name="combo2" id="combo_2" onChange="change(this);" style="width:200px;">
	<option value="value1">  </option>
</select>
<BR><BR>


</form>
</body>
</html>

<script type="text/javascript">

/*
Triple Combo Script Credit
By Philip M: http://www.codingforums.com/member.php?u=186
Visit http://javascriptkit.com for this and over 400+ other scripts

Modified by: jmrker
*/

var categories = [];
categories["startList"] = ["Diploma/Certificate:CE","Associate's:AA","Bachelor's:BA","Master's:MA"];

categories["Diploma/Certificate"] = ["C_Arts & Humanities:CE1","C_Automotive:CE2","C_Computers & IT:CE3","C_Education & Teaching:CE4","C_Health & Medical:CE5","C_Trades & Careers:CE6"];
categories["C_Arts & Humanities"] = ["Desktop Publishing:CEDP","Floral Design:CEFD","General Arts:CEGA","Interior Decorating:CEID","Jewelry:CEJ"];
categories["C_Automotive"] = ["Automotive Technician Training:CAUTO","Collision and Auto Body Repair:CCOLL","Motorcycle Mechanic Training:CMM"];
categories["C_Computers & IT"] = ["Cisco:CECS", "Information Technology:CEIT", "Microsoft:CEMS", "Network Systems:CENSYS", "Oracle:CEOR", "PC Repair:CEPC"];
categories["C_Education & Teaching"] = ["Child Day Ca CEDC", "General Education:CEGE"];
categories["C_Health & Medical"] = ["Dental Assisting:CEDENT", "Fitness:CEFIT", "Healthca CEHC", "Massage Therapy:CMT", "Medical Assisting:CEMEA", "Medical Billing and Insurance Coding:CEMBIC", "Medical Office Administration:CEMOA", "Occupation Therapy:CEOT", "Phlebotomy:CEPHL", "Social Work:CESW"];
categories["C_Trades & Careers"] = ["Administrative Assistant:CEAA", "Animal Ca CEAC", "Appliance Repair:CEAR", "Bookkeeping and Payroll Accounting:CEBOO", "Bridal Consulting:CEBC", "Carpentry and Construction:CECC", "Culinary:CECU", "Drafting:CEDR", "Electronics:CEEL", "Forestry and Wildlife:CEFW", "Gunsmithing:CEGUN", "HVAC:CEHV", "Landscaping:CELS", "Law Enforcement:CELE", " Locksmithing:CELOCK", "Plumbing and Electrical:CEPE", "Private Investigator:CEPI", "Wedding Planner:CEWP"];

categories["Associate's"] = ["A_Arts & Humanities:AA1","A_Business:AA2","A_Criminal Justice:AA3","A_Computers & IT:AA4","A_Education & Teaching:AA5","A_Health & Medical:AA6","A_Science & Technology:AA7","A_Social Sciences:AA8","A_Trades & Careers:AA9"];
categories["A_Arts & Humanities"] = ["Communication:AACOM","Fashion:AAFASH","Game Design:AAGD","General Arts:AAGA","Graphic Design:AAGR","Religion:AAREL","Web Design:AAWD","Writing:AAWR"];
categories["A_Business"] = ["Accounting:AAAC","Administrative Assistant:AAAS","Business Administration:AABA","eBusiness and eCommerece:AAEB","Finance:AAFIN","Human Resources Management:AAHR","International Business:AAIB","Marketing:AAMAR","Organizational Leadership:AAOR","Project Management:AAPM"];
categories["A_Criminal Justice"] = ["Criminal Justice:AACJ","Homeland Security:AAHS","Law:AALAW","Legal Assisting Paralegal:AAPAR","Political Science:AAPS"];
categories["A_Computers & IT"] = ["Computer Networking and Security:AACNS","Computer Science:AACS","Databases:AADB","Information Systems:AAIS","Information Technology:AAIT","Technology Management:AATEM","Web Development:AADEV"];
categories["A_Education & Teaching"] = ["Adult and Higher Education:AAHE","Curriculum and Instruction:AACI","Early Childhood Education:AAEVE","General Education:AAGE","Special Education (K-12):AASE"];
categories["A_Health & Medical"] = ["Gerontology (Study of people as they age):AAGER","Healthca AAHLTH","Healthcare Management:AAHCM","Medical Assisting:AAMA","Medical Billing and Insurance Coding:AAMBIC","Medical Office Administration:AAMOA","Nursing:AANUR","Radiology & Sonography:AARAD"];
categories["A_Science & Technology"] = ["Aviation:AAAV","Engineering Management:AAEN","Environmental Sciences:AAENV","Science:AASCI"];
categories["A_Social Sciences"] = ["Counseling:AACOUN","History:AAHIST","Psychology:AAPSY","Public Administration:AAPA","Public Safety:AAPUBS","Social Science:AASS"];
categories["A_Trades & Careers"] = ["Animal Ca AAAC","Carpentry & Construction:AACAR","Fire and Law Enforcement:AALE","Travel and Tourism:AATR"];

categories["Bachelor's"] = ["B_Arts & Humanities:BA1","B_Business:BA2","B_Computers & IT:BA3","B_Criminal Justice:BA4","B_Education & Teaching:BA5","B_Health & Medical:BA6","B_Science & Technology:BA7","B_Social Sciences:BA9","B_Trades & Careers:BA0"];
categories["B_Arts & Humanities"] = ["Communication:BACOM","Fashion:BAFASH","Game Design:BAGD","General Arts:BAGA","Graphic Design:BAGR","Music:BAMUS","Religion:BAREL","Web Design:BAWD","Writing:BAWR"];
categories["B_Business"] = ["Accounting:BAAC","Business Administration:BABA","eBusiness and eCommerece:BAEB","Entrepreneurial Studies:BAES","Finance:BAFIN","Human Resources Management:BAHR","International Business:BAIB","Marketing:BAMAR","Organizational Leadership:BAOR","Project Management:BAPM"];
categories["B_Computers & IT"] = ["Computer Networking and Security:BACNS","Computer Science:BACS","Databases:BADB","Information Systems:BAIS","Information Technology:BAIT","Technology Management:BATM","Web Development:BADEV"];
categories["B_Criminal Justice"] = ["Criminal Justice:BACJ","Homeland Security:BAHS","Law:BALAW","Legal Assisting Paralegal:BAPAR","Political Science:BAPS"];
categories["B_Education & Teaching"] = ["Adult and Higher Education:BAHE","Curriculum and Instruction:BACI","Early Childhood Education:BAECE","General Education:BAGE","Special Education (K-12):BASE"];
categories["B_Health & Medical"] = ["Gerontology (Study of people as they age):BAGR","Healthca BAHLTH","Healthcare Management:BAHCM","Medical Assisting:BAMA","Nursing:BANUR","Radiology & Sonography:BARAD"];
categories["B_Science & Technology"] = ["Aviation:BAAV","Electronics Engineering:BAEE","Engineering Management:BAEN","Environmental Sciences:BAENV","Mathematics:BAMS","Science:BASCI"];
categories["B_Social Sciences"] = ["Counseling:BACOUN","History:BAHIST","Psychology:BAPSY","Public Administration:BAPA","Public Safety:BAPUBS","Social Science:BASS","Sociology:BASOC"];
categories["B_Trades & Careers"] = ["Fire and Law Enforcement:BALE"]

categories["Master's"] = ["M_Arts & Humanities:MA1","M_Business:MA2","M_Computers & IT:MA3","M_Criminal Justice:MA4","M_Education & Teaching:MA5","M_Health & Medical:MA6","M_Science & Technology:MA7","M_Social Sciences:MA9"];
categories["M_Arts & Humanities"] = ["Communication:MACOM","Game Design:MAGD","General Arts:MAGA","Graphic Design:MAGR","Music:MAMUS","Religion:MAREL","Web Design:MAWD","Writing:MAWR"];
categories["M_Business"] = ["Accounting:MAAC","Business Administration:MBA","eBusiness and eCommerece:MAED","Entrepreneurial Studies:MAES","Finance:MAFA","Finacial Planning:MAFPL","Human Resources Management:MAHR","International Business:MAIB","Marketing:MAMAR","Organizational Leadership:MAOR","Project Management:MAPM"];
categories["M_Computers & IT"] = ["Computer Networking and Security:MACNS","Computer Science:MACS","Databases:MADB","Information Systems:MAIS","Information Technology:MAIT","Technology Management:MATM","Web Development:MADEV"];
categories["M_Criminal Justice"] = ["Criminal Justice:MACJ","Homeland Security:MAHS","Law:MALAW","Legal Assisting Paralegal:MAPAR","Political Science:MAPS"];
categories["M_Education & Teaching"] = ["Adult and Higher Education:MAHE","Curriculum and Instruction:MACI","Early Childhood Education:MAECE","General Education:MAGE","Special Education (K-12):MASE"];
categories["M_Health & Medical"] = ["Gerontology (Study of people as they age):MAGR","Healthca MAHLTH","Healthcare Management:MAHCM","Medical Assisting:MAMA","Nursing:MANUR","Radiology & Sonography:MARAD"];
categories["M_Science & Technology"] = ["Aviation:MAAV","Electronics Engineering:MAEE","Engineering Management:MAEN","Environmental Sciences:MAENV","Mathematics:MAMS","Science:MASCI"];
categories["M_Social Sciences"] = ["Counseling:MACOUN","History:MAHIST","Psychology:MAPSY","Public Administration:MAPA","Public Safety:MAPUBS","Social Science:MASS","Sociology:MASOC"];

var nLists = 3; // number of select lists in the set

function fillSelect(currCat,currList){
  var step = Number(currList.id.replace(/\D/g,""));
  for (i=step; i<nLists+1; i++) {
    document.forms['form1']['List'+i].length = 1;
    document.forms['form1']['List'+i].selectedIndex = 0;
  }
  var tmp = currCat.split(':');
  var nCat = categories[tmp[0]];
  for (each in nCat) {
    tmp = nCat[each].split(':');
    var nOption = document.createElement('option'); 
    var nData = document.createTextNode(tmp[0]); 
    nOption.setAttribute('value',nCat[each]); 
    nOption.appendChild(nData); 
    currList.appendChild(nOption); 
  } 
}

function getValue(L3, L2, L1) {
  var l3 = L3.split(':');
  var l2 = L2.split(':');
  var l1 = L1.split(':');
//  alert("Your selection was:- \n" + L1 + "\n" + L2 + "\n" + L3);
//  alert("Your selection was:- \n" + l1[1] + "\n" + l2[1] + "\n" + l3[1]);
}

function init() {
  fillSelect('startList',document.forms['form1']['List1'])
}

navigator.appName == "Microsoft Internet Explorer" 
                   ? attachEvent('onload', init, false) 
                   : addEventListener('load', init, false);	

</script> 
</head>
<body>
<form name="form1" action="">
<table>
                          <tr>

                            <td class="frmText" style="color: #000000; font-weight: normal;">Degree:</td>

                            <td><select id='List1' onchange="fillSelect(this.value,this.form['List2'])">
							<option selected>Select degree</option>
							</select> </td>
							</tr>
						 <tr>
						 <td class="frmText" style="color: #000000; font-weight: normal;">Area of Study:</td>
							<td><select id='List2' onchange="fillSelect(this.value,this.form['List3'])">
							<option selected>Select area of study</option>
							</select>
							</td>
							</tr>
						 <tr>
						 
						 <td class="frmText" style="color: #000000; font-weight: normal;">Program of Interest:</td>
							<td><select class="frmInput" id="List3" name="ProgramOfInterest" onchange="getValue(this.value,this.form['List2'].value, 
							this.form['List1'].value)">
							<option selected >Select program</option>
							</select>
							</td>

                          </tr>
						  </table>
</form>