asked on

dynamic dropdown boxes

I hope that somebody can help

I have taken some code from the solution of https://www.experts-exchange.com/questions/10968981/Populating-DropDowns-from-A-Database.html and have modified it to fit in with my tables.

Given my non-existent knowledge of java, I am very proud to have gotten to my current position. I am able to correctly populate the first drop-down but have fell fowl in the sub-option section.

My tables are

lut_jcu_degrees with field degree as the primary key (varchar2)

lut_discipline_degree with field id as the primary key (number); the field degree is the foreign key (varchar2)

I suspect that my problem could well lie with the fact that the pk/fk are varchar2 - unfortunately I am not in the position to change this as this is information comes to me from an external source.

I am hoping that somebody can help me to re-modify the code so that when an option is selected in the first box, only those corresponding options are displayed through the second drop-down.

Also, I am not sure how I go about actually having the values that do get selected submitted... I can get to this later though, my first priority is to get the two list correlating.

Any help is greatly appreciated.

My code follows


<CFQUERY NAME="qrydegree" DATASOURCE="corpdb" DBTYPE="ODBC">
SELECT degree, description
FROM lut_jcu_degrees
ORDER BY description
</CFQUERY>


<CFQUERY NAME="qrydisdeg" DATASOURCE="corpdb" DBTYPE="ODBC">
SELECT id, discipline, degree
FROM lut_discipline_degree
ORDER BY discipline
</CFQUERY>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>
<HEAD>
<TITLE>Dynamic Select Box Updates from Cold Fusion</TITLE>
</HEAD>


<CFWDDX ACTION="CFML2JS"
INPUT="#qrydegree#"
TOPLEVELVARIABLE="jsdegreeTLV"
OUTPUT="jsdegree">


<CFWDDX ACTION="CFML2JS"
INPUT="#qrydisdeg#"
TOPLEVELVARIABLE="jsdisdegTLV"
OUTPUT="jsdisdeg">


<SCRIPT TYPE="text/javascript" LANGUAGE="JavaScript" SRC="../CFIDE/scripts/wddx.js">
</SCRIPT>


<SCRIPT LANGUAGE="JavaScript">


<CFOUTPUT>#jsdegree#</CFOUTPUT>


<CFOUTPUT>#jsdisdeg#</CFOUTPUT>


function choosenext()
{

if (document.TestForm.Select1.selectedIndex==0)
{
document.TestForm.DynamicSelect.options.length=0;
NewOpt=new Option;
document.TestForm.DynamicSelect.options[0]=NewOpt;
}


else
{
document.TestForm.DynamicSelect.options.length=0;
var BoxNum = 0;
for (var RowNum=0; RowNum<jsdisdegTLV.id.length; RowNum++)
{
if (jsdisdegTLV.degree[RowNum] == document.TestForm.Select1.selectedIndex)
{
NewOpt=new Option;
NewOpt.value=jcdisdegTLV.id[RowNum];
NewOpt.text=jcdisdegTLV.discipline[RowNum];
document.TestForm.DynamicSelect.options[BoxNum]=NewOpt;
BoxNum++;
}
}
}
document.TestForm.DynamicSelect.options[0].selected = true;
}
</SCRIPT>

<BODY>


<FORM ACTION="test_action.cfm" METHOD="POST" NAME="TestForm">

Select an option:
<select name="Select1" onChange="choosenext();">
<OPTION VALUE="0">Choose One</OPTION>
<cfoutput query="qrydegree">
<OPTION VALUE=#degree#>#description#</OPTION>
</cfoutput>
</SELECT>  
Sub-option:
<SELECT NAME="DynamicSelect">
<OPTION VALUE="0">         </OPTION>
</SELECT>
<BR><BR>

<INPUT TYPE="Submit">
</FORM>

</BODY>
</HTML>

ASKER CERTIFIED SOLUTION

hart

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jainesteer

ASKER

Thanks for that - I do appear to be getting slightly better at this whole CF/Java thing even though I have absolutely no idea about what I am doing.

I have mastered the whole two related drop down thing for a SINGLE entry, but now would like to give users a first and second preference option. I have included the code to date, and all works except that I can only ever get the last row of data to have entries in both columns. I would REALLY appreciate somebody taking a quick look at the code that I have so far - I know that I have to loop but where to go next is a big mystery.

<CFQUERY NAME="qrydisdeg" DATASOURCE="corpdb" DBTYPE="ODBC">
SELECT LUT_DISCIPLINE_DEGREE.ID, LUT_DISCIPLINE_DEGREE.DISCIPLINE, LUT_JCU_DISCIPLINES.DESCRIPTION AS Discipline_name, LUT_DISCIPLINE_DEGREE.DEGREE, LUT_JCU_DEGREES.DESCRIPTION AS Degree_name
FROM (LUT_DISCIPLINE_DEGREE INNER JOIN LUT_JCU_DEGREES ON LUT_DISCIPLINE_DEGREE.DEGREE = LUT_JCU_DEGREES.DEGREE) INNER JOIN LUT_JCU_DISCIPLINES ON LUT_DISCIPLINE_DEGREE.DISCIPLINE = LUT_JCU_DISCIPLINES.DISCIPLINE;

</CFQUERY>
<table width="800" cellspacing="5" cellpadding="1" border="2" >

<cfloop from="1" to="1" index="x">
<tr>
<CF_TwoSelectsRelated
      QUERY="qrydisdeg"
      NAME1="webtitle#x#"
      NAME2="Discipline#x#"
      DISPLAY1="Degree_name"
      DISPLAY2="Discipline_name"
      VALUE1="Degree"
      VALUE2="Discipline"
      FORCEWIDTH1="70"
      FORCEWIDTH2="70"
      SIZE1="1"
      SIZE2="1"
      AUTOSELECTFIRST="Yes"
      EMPTYTEXT1="(choose a course of study)"
      EMPTYTEXT2="(now choose a discipline)"
      ONCHANGE="updateTable('#x#')"
      FORMNAME="App">
</cfloop>

</table>

mrichmon

It sounds like Hart answered your original question since he provided the link that you have used for 2related selects. SO really he should get the points and then you should post a new question for other issues. But, please be clear on what exactly you new issue is because I am a little confused by what you are trying to do.

You have a loop around the CF_TwoSelectsRelated tag.

But your loop goes from 1 to 1 which means it only runs once - so why even have the loop?