Form Validation - Dynamic Checkbox

Apr 20, 2007

I have a form which contains a number of check boxes in format of fielduse_x where x is incremented each time (1 - 30)

Everytime one of the checkboxes is ticked or unticked i want to perform a function for related boxes but i am having difficaulty doing this.

The code i have in the javascript is :

function changeStatus(f)
{
alert(f);
if(document.newForm.fielduse_[f].checked==true)
alert("YES")
else
alert("NO");
}

f is passed from the form field and contains the number (1 - 30). I know that the form is passing the values across as alert(f) gives the correct number. I don't seem to be able to get the next line to work. How do i put the value of f into the if statment as what i have done isn't working

if(document.newForm.fielduse_[f].checked==true)

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Dynamic Validation - Checkbox Checked On Submission?

Jan 10, 2011

I have an HTML table with <tr> sections that is generated by php which looks like the following
HTML Code:
<tr align='center' class='row_a'>
<td align='center'><input id = 'assign0' type='checkbox' name='agent_8949' value='0' /></td></tr>
<tr align='center' class='row_b'>
<td align='center'><input id = 'assign1' type='checkbox' name='agent_8950' value='1' /></td></tr>
<tr align='center' class='row_a'>
<td align='center'><input id = 'assign2' type='checkbox' name='agent_8951' value='2' /></td></tr>
<tr align='center' class='row_b'>
<td align='center'><input id = 'assign3' type='checkbox' name='agent_8952' value='3' /></td></tr>

The id's and values are generated by php, my problem is, I want to use javascript to check if anyone of the check boxes has been checked on submission meaning that I have to go through the <tr> list. Here is my JS code which only works for one id.
Code:
//I know the length of the checkbox (checkBoxID) fields which is the number of rows in the database table
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if(document.getElementById(id_Prefix+i).checked == false){//how do I check the next one?
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}}}

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[url]

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