Checking on parent page field on multi use form

[stevehowe]

I have a form which can be called as a subform from a parent form, or as a stand alone form straight from the opening menu.

If the form is called from a parent form I have to populate a radio button field. I have tried inheriting a field from the parent form but for some reason this doesn't want to work, possibly due to buggy application software, so this is not an option.

The solution I came up with involves calling a Javascript function when the page opens which works and populates the field:

function pop_how()
{
if (opener.MainForm.Field9999999_2025!=null){
MainForm.Field9992075_5578[2].checked=true;
}
}

This works a treat and allows me to default the field when opened from the parent form.

The problem comes when the form is opened standalone and opener.MainForm is null. How can I fix my function to take this into account?

I have tried changing the test to opener.MainForm!=null and get an error returned that opener.MainForm is not an object.

 

[dwarfthrower]

Check if [tt]opener[/tt] is not null, then check if [tt]opener.MainForm[/tt] is not null.

if(opener != null && opener.MainForm != null)

Or, for complete peace of mind, add in a final check for [tt]opener.MainForm.Field9999999_2025[/tt] and also a check to see if it has an option at array position 2:

if(opener != null && 
   opener.MainForm != null &&
   opener.MainForm.Field9999999_2025 != null &&
   opener.MainForm.Field9999999_2025[2] != null)

Javascript fails out of the logical test on the first [tt]false[/tt] it finds so you don't need to nest the [tt]if[/tt] statements, if anything leading up to the radio button you want to test is null it will stop looking and avoid the error.

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[stevehowe]

you are an absolute star, that has worked