Hiding multiple fields on a form if they are empty.

Question

I have created a PDF form that has many user fillable fields and also has spawned template pages for additional information. I am looking for a way for the user of the form to hide any empty form fields and drop down fields that the did not need.

I have found scrip to identify empty fields if they are marked as required and i have found examples of JS to hide select individual fields only by their name controlled by a checkbox. Listing the fields by name wont work because i do not know what fields will be empty and if i did there are maybe 100 different field names.

I believe there must be a script to first identify empty fields on a select page and, if empty, to hide the fields / dropdowns. I am thinking this would be controlled with a mouse up JS button on the page.

100% disclosure, Beyond Novice here! Learning but probably over my head, yet. so far i have learned / managed to do quite alot with this form through searching this and other forums. But would prefer if someone could provide me the complete script to do so since i am not understanding how to combine seperate operations.

Thank you,

Thom Parker · Answer

"Empty" fields can be identified with two different methods

1. Compare the field value to an empty string. This works for most text fields, but is otherwise unreliable.

2. Compare the field value to it's default value. This works for all fields that have a value, i.e. no buttons and signatures.

Identifying the page for a field is not as straight forward as you'd think. Conceptually, fields do not exist on pages, they are document level entities. What you see on the page is a widget annotation that acts as the UI for the field. A field can have many widgets on different pages. So, if there is more than one field widget, the field "page" property is an array of page numbers. But if there is only one field widget, then there the "page" property is a single number.

So here is a function that determines if a field object is empty an on a particular page.

function IsEmptyOnPage(oFld, nPg)

{

return (oFld.value == oFld.defaultValue) && ((typeof(oFld.page) == "number"?nPg == oFld.page:oFld.page.indexOf(nPg) >= 0))

}

Here's how it's used to hide all empty fields on the current page

var oFld;

for(var i=0;i<this.numFields;i++)

{

oFld = this.getField(this.getNthFieldName(i));

if(IsEmptyOnPage(oFld,this.pageNum))

oFld.display = display.hidden;

}

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