Question

Checkbox validation using cfform

Asked by: michgantt

I want to make sure that at least one checkbox is checked in each of several checkbox groups (within each group, all the checkboxes have the same name) before the form can be submitted. I want to use cfform rather than form so that the error messages for the text fields display in a popup instead of on a different page. This is a multi-page form and I don't want the user to have to click the back button. I have searched for and tried a bunch of solutions, but none of them work with cfform. I am relatively new to ColdFusion and am using MX7.

<tr valign="top">
    <td class="homepage_content" align="right"><font color="#FF0000">*</font><b>Contact Type</b><br>
   (select all that apply)</td>
   <td class="homepage_content">
        <cfset max=2><cfset start=1><cfset RowNum = #getContactType.Recordcount#/2 + 1>
        <table border="0" width=100% cellpadding="0" cellspacing="0">
                <cfloop from="1" to="#RowNum#" index="x">
	<tr>
	<cfoutput query="getContactType" startrow=#start# maxrows=#max#>
	    <td class="homepage_content"><cfinput type="checkbox" value="#TypeOfContactID#" name="ContactType">#TypeOfContact#</td>
	</cfoutput>
                     </tr>
	<cfset start = start + max>
              </cfloop>
            </table>
        </td>
	</tr>
                                  
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Asked On
2009-10-13 at 12:42:48ID24808997
Tags

cfinput

,

checkbox

,

validation

Topics

Cold Fusion Markup Language

,

ColdFusion Application Server

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: myselfrandhawaPosted on 2009-10-14 at 20:29:25ID: 25577002

I am not sure what exactly you are trying to do here but you can try like this:

<cfoutput query="getContactType" startrow=#start# maxrows=#max#>
<cfif typeofcontactID IS 'yes'>
            <td class="homepage_content"><cfinput type="checkbox" value="#TypeOfContactID#" name="ContactType" checked>#TypeOfContact#</td>
<cfelseif TypeOfContactID IS 'no'>
            <td class="homepage_content"><cfinput type="checkbox" value="#TypeOfContactID#" name="ContactType">#TypeOfContact#</td>
</cfif>
        </cfoutput>


 

by: michganttPosted on 2009-10-15 at 11:08:38ID: 25583120

This solution gives me one checked checkbox when the page loads.

What I am trying to do is have the list of checkboxes show (which my code is doing correctly), but to ensure that at least one is selected when the Submit button is clicked.

I can find a lot of solutions using <form>, but I want to use <cfform> and have an error message display if one is not selected - preferably either on the same page or in a popup. I don't 't want the user to have to click the back button to fix the form.

 

by: myselfrandhawaPosted on 2009-10-15 at 18:11:22ID: 25586290

I am undertsanding your question completely but here is a small solution


you want that intialially your cfform should be checked by default:

then why not use the checked property of cfinput tag and set it to yes, it will make it yes. or use javascript like when user clicks submit, he should be prompted to check at least one value

 

by: myselfrandhawaPosted on 2009-10-15 at 19:01:23ID: 25586485

sorry i am not understanding ur question properly

 

by: ZvonkoPosted on 2009-10-16 at 00:48:47ID: 25587597

Post your cfform that you have so far please.

 

by: _agx_Posted on 2009-10-16 at 13:52:29ID: 25593232

One way is using a hidden field to trigger the validation via the onValidate attribute:

<script type="text/javascript">
   // Must use this exact signature. Required by CFFORM validation
   function ValidateContactType(theForm, theField, theValue)
   {
      var foundCheckedBox = false;
      var fields = document.getElementsByName('ContactType');
      for (var i = 0; i < fields.length; i++)
      {
         if (fields[i].checked) 
         {
            foundCheckedBox = true;
            break;
         }
      }
      // returns true if at least one box was checked 
      return foundCheckedBox;
   }
</script>
<cfform>
   <!--- use a hidden field to trigger the validation --->
   <cfinput type="hidden" name="checkboxValidation" message="Check at least one of the boxes!"
         onValidate="ValidateContactType">
   
   <cfinput type="checkbox" name="ContactType" value="1">Type 1<br>
   <cfinput type="checkbox" name="ContactType" value="2">Type 2<br>
   <cfinput type="checkbox" name="ContactType" value="3">Type 3<br>
   <cfinput type="submit" name="SubmitButton">
</cfform>

                                              
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by: _agx_Posted on 2009-10-16 at 13:53:37ID: 25593244

BTW:  Obviously the hard coded checkbox fields are just for demo purposes.  

 

by: michganttPosted on 2009-10-19 at 11:40:56ID: 31640736

This is exactly what I want my form to do. Thanks!

20120131-EE-VQP-002

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