test for the empty string w / javascript

Hi - quick question.

I have a region of javascript to disable some elements on the page if they are not null. (Cannot use the State read-only in this case.)

What I have tried is the following:

If (valueOf(&P202_KEY_NAME1.)! = ") {}
document.getElementById("P202_KEY_NAME1").disabled = true;
}

(These are 2 quotes at the end).

This comparison will fail with an error when there is a value in P202_KEY_NAME1.

I also tried just so (valueOf (& P202_KEY_NAME1)) ... But it always seems
true test... even when the element is empty.

What kind of point of reference and comparison I need here? They are elements of text.

Thank you
Carol

You're using valueOf() incorrectly.

Please look at the documentation: http://www.w3schools.com/jsref/jsref_valueOf_boolean.asp; so you'd like: var_name.valueOf)

But anyway, valueOf really only works with a boolean object. Your agenda of the page would be an element of the string.

Just do: if (& P202_KEY_NAME1. is 'true') {/ todo}? (edit: of course, which is, assuming that it is the value of the element of your page contains - I do not know what is in your article)

Van
Trent

Published by: trent on December 29, 2010 13:32

Tags: Database

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