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Can't Access Icon Object, Name Property in PDF Document

fctallantjr
fctallantjr asked
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Last Modified: 2010-05-18
Why can't I access Icon Object, Name Property in PDF Document ?

The Acrobat 8 (and 7) javascript reference document gives this example code:

Example 1
Report the number of named icons in the current document.
if (this.icons == null)
console.println("No named icons in this doc");
else
console.println("There are " + this.icons.length
+ " named icons in this doc");

Example 2
List all named icons the current document.
for (var i = 0; i < this.icons.length; i++) {
console.println("icon[" + i + "]=" + this.icons[i].name);
}

Using this code syntax, I can get javascript to tell me the value in "this.icons.length", but it will not tell me "this.ocons[i].name".

When referencing a document that has more than one ocon object, as indicated by the value returned by the length property,
the reference to the name property gives the following error:

     Acrobat JavaScript Debugger Functions Version 7.0
     Acrobat Database Connectivity Built-in Functions Version 8.0
     Acrobat EScript Built-in Functions Version 8.0
     Acrobat Annotations / Collaboration Built-in Functions Version 8.0
     Acrobat Annotations / Collaboration Built-in Wizard Functions Version 8.0
     Acrobat Multimedia Version 8.0
     Acrobat SOAP 8.0

     TypeError: this.icons[i] has no properties
     12:Field:Mouse Up
     TypeError: this.icons[i] has no properties
     12:Field:Mouse Up

Here is my specific code:

     var strFieldsInfo='';
     if (this.icons == null)
       strFieldsInfo="No named icons in this doc";
     else
       for (var i = 0; i < this.icons.length; i++) {
       console.println("icon[" + i + "]=" + this.icons[i].name);
     }


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Commented:
It works for me. I used both Acrobat 7 and 8 to verify that your code (which as you indicate is from the AcroJS guide) does work.

I created a new elements in the PDF file with these two lines (for two different button named and icon ids):

var f = this.getField("Button1");
this.addIcon("myButtonIcon", f.buttonGetIcon());

Once I run the code from the end of your question in the JavaScript debugger, it correctly showed the two names:

var strFieldsInfo='';
     if (this.icons == null)
       strFieldsInfo="No named icons in this doc";
     else
       for (var i = 0; i < this.icons.length; i++) {
       console.println("icon[" + i + "]=" + this.icons[i].name);
     }
icon[0]=myButtonIcon
icon[1]=myButtonIcon2

undefined


It looks like you are trying to do this from a mouse event handler. Can you please describe exactly how you are using the code.

Author

Commented:
How am I using the code?

Yep, it's executing in a mouse click event of a button.  So the problem is a security restriction on doing this?
CERTIFIED EXPERT

Commented:
Is there anything else you are doing? Using the same code in a button event also works for me. There should not be any security restrictions around the icon object (at least not according to the documentation).
CERTIFIED EXPERT

Commented:
Can you provide the PDF file that shows the problem?

Author

Commented:
File emailed to khkremer.
CERTIFIED EXPERT
Commented:
I don't know what you did with that file, but you ended up with some of the icons set to NULL. Usually, when you remove an icon with the this.removeIcon() method, the whole icon list gets adjusted, and you don't end up with "holes" in the list. In your case, you somehow did end up with these holes. If you use exception handling, you can still get the correctly named icons:

var strFieldsInfo='';
     
if (this.icons == null)
    strFieldsInfo="No named icons in this doc";
else
{      
    for (var i = 0; i < this.icons.length; i++)
    {
        try {
            console.println("icon[" + i + "]=" + this.icons[i].name);
        }
        catch (e)
        {
           console.println(e);  // comment this line if you don't want the exception message
        }
    }
}

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Author

Commented:
The file did indeed contain null values for some the icons in the icon object.  Knowing this lets me go forward, so Kudos to Kremer.

There was error in the code that attempted to insert the icons in the first place, and this was what caused the NULL values.  
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