Checkbox Required

[LadyDi]

Is there a way to make a field required based on whether or not a checkbox is marked? I have a text field that appears when a checkbox is marked. I would like that text field to be required when it is visible. Is this possible? I am using Acrobat Professional 8.0 to create the form.

[Philip M]

Pseudo code:-

if (the checkbox is checked) { //and hence the textfield is visible
if (document.getElementById("textfieldid").value == "": // empty
alert (You must enter something into the textfield");
return false;
}
}

But of course value == "" is poor validation as even a single space or a ? will return false (i.e. pass the test). You need to strip leading spaces (and perhaps numbers and special characters) and then set a suitable minimum length for the entered text.



"Normally the Pakistani police are armed with rifles and atomic weapons". - Political commentator.

[jmrker]

Try this ...

Assuming you have HTML that looks something like this:

<input type="checkbox" id="CBox"
 onclick="vis='none';if(this.checked) {vis='block'};document.getElementById('Comments').style.display=vis" >Comments<br>
<textarea id="Comments" style="display:none"></textarea>

In your validation section add:

if ((document.getElementById('CBox').checked==true)
  &&  (document.getElementById('Comments').value == ''))
  { alert('Comments required when checked'); return false; }
// ... other validation
return true; // if all else OK

Note: code not tested, but should work.

Man that 'PhilliM' is a fast typist!!!

[Philip M]

Small typo in code above:-

&& (document.getElementById('Comments').value == ''))

Is there a way to make a field required based on whether or not a checkbox is marked? I have a text field that appears when a checkbox is marked. I would like that text field to be required when it is visible. Is this possible? I am using Acrobat Professional 8.0 to create the form.

A small point but what if the user enters a comment and then unchecks the checkbox? It might be an idea to cause the checkbox to remain checked whenever there is any text in the comments field.

if (document.getElementById('Comments').value != "")) {
((document.getElementById('CBox').checked = true);
}

[LadyDi]

This is the code I put in.

if (Unit_Down == "Yes") { //and hence the textfield is visible
if && (document.getElementById('UnitDownEx').value == ''))
alert ("You must enter something into the textfield");
return false;
}
}

Unit_Down is my checkbox. "Yes" is the export value of that box. UnitDownEx is my text field. I keep getting an error message that reads "Missing ( before condition" and it highlights the line that begins "alert". What have I done wrong?

[Philip M]

if (Unit_Down.value == "Yes") { //and hence the textfield is visible
if && (document.getElementById('UnitDownEx').value == ''))