[javascript] Check existance of value
 

Hi,

I have an object el which was taken from getElementById.

I need to make sure that it has the proper object, so I need to check whether or not the value property exists on the object el.

I tried
if(!el.value)

that just makes it check for a blank value not a non-existant value.

I also tried

if(typeof (t_el) ==undefined)

but it won't work either because it seems that getElementById always gives me an object, whether or not it was really found.

How can I check the existance of the property value on the object el?

Secondly, is there a function I can use to dump a object or array to a string?

Thanks,
David

okk, I found hasAttribute on w3.org.

but it doesn't work:

Error: t_el has no properties
Source File: http://server.tld/path/to/script.ext
Line: 28

Is there a function that can check an object for properties maybe?

I remember reading that somewhere in the object model, the entire list of elements in the form is returned as an array. So a solution might be to scan the array to check whether what you want is available.

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