passing checkbox values to the action page

Hi All, I need to solve this issue..

I'm getting the values for my checkbox in a loop and if the user checks the "select all"checkbox all the data should be deleted from the table and if the user checks only one checkbox I need to delete only the particular selected value from the table..

my problem really is when I passing the values to the action page only the first value(chk_box_1) is being passed and I'm getting an error "chk_box_2".... is not defined.

Any clue?

checkboxes that aren't checked aren't even passed over from the browser when the form is submitted

that's the way they work

therefore you must check to see if the checkbox is present, i.e. exists, before you use it

some people like to use IsDefined but i use CFPARAM

If there is a chance that one of the checkboxes won't be checked you have to test for it's existence on the action page. Remember that HTML forms don't pass in any unchecked check boxes.

You can check for it's existence like this:

<cfif structKeyExists( form, 'myCheckboxField' )>
...the field is there...
</cfif>

Or if you prefer you can automatically create it and set it to a default value if it doesn't exist with <cfparam>.

Hi All

thanks for the response.Please review the code given below which I'm using and give me a solution to solve the issue.

This is what I'm trying to do in the form page.

<---javascript to select check all check box--->

function selectedList(src)
{
if(document.frm_workorder.deleteall.checked)
set(1);
else
set(0);
}

function set(setOrUnset)
{
for (var i = 1; i <= document.frm_workorder.Total_check_boxes.value; i++)
{
var object = eval("document.frm_workorder.chk_proj_" + i);
if(setOrUnset == 1)
object.checked = true;
else
object.checked = false;
}
}

function deleteapprover()
{
if (deleteapprover.arguments.length == 0)
{
var objectchecked = false;
for (var i = 1; i <= document.frm_workorder.Total_check_boxes.value; i++)
{
var object = eval("document.frm_workorder.chk_proj_" + i);
if(object.checked)
{
objectchecked = true;
break;
}
}
if(!(objectchecked))
{
alert("Please select the checkbox first to delete a record");
return;
}
else
//submit
document.frm_workorder.action = "add_approveraction1.cfm?mode=delete";
document.frm_workorder.submit();
}
else
{
if(confirm("This Approver will be deleted"))
{
document.frm_workorder.deleteall.checked = true;
set('1');
document.frm_workorder.action = "add_approveraction1.cfm?mode=delete";
document.frm_workorder.submit();
}
}
}
<--end of java script>


<--to select all the check boxes to delete all the records in one time-->

<a href="javascript:deleteapprover();" class="sm_text_small"> Delete </a>

<form name="frm_workorder" action="post">
<TD align="left" valign="middle" class="sm_text_small" nowrap width="50">Select All<BR><a href="" class="small_helpers"><input type="checkbox" name="deleteall" value="" align="middle" onclick="selectedList(this);"></a></TD>

<--I could able to select and deselect the check boxes at his point-->


<cfset chk_box_counter = 0>
<cfset currentrow ="">
<cfloop query = "getmgrntfy">
<cfset chk_box_counter = chk_box_counter + 1>
<TD align="left" valign="middle" class="Text">
<input type="checkbox" value="#ntfy_em_id#" name="chk_proj_#chk_box_counter#" align="middle"></TD>
</cfloop>
</form>

Action page...(add_approveraction1.cfm)

<cfif isdefined("form.mode")>
<cfif mode eq "delete">
<cfloop index="count" from=1 to="#Form.Total_check_boxes#">
<cfset chkproj = "form.chk_proj_#Evaluate(count)#">
<cfset chkproj = "#Evaluate(chkproj)#">
<cfquery name="deleteusernotify" datasource="#DBName#">
delete
from un
where un.NTFY_EM_ID = '#chkproj#'
</cfquery>
</cfloop>
</cfif>
</cfif>

<--I'm getting an error while submitting after checking only one check box

Variable form.chk_proj_2 is undefined.

-->

Any clue.

But I can able to delete all the records If I checked select all check box...

Thanks..

It sounds like there is a problem in your Javascript somewhere. That's probably where you need to debug. However you do it you should still provide server-side validation for missing fields becuase it is simple to turn off Javascript.