Phone API Reference - Extended - util.isDef
- Kelli Higdon
- Lorne Gaetz (Unlicensed)
Owned by Kelli Higdon
Desk Phone API features described in this section are deprecated and supported only on the following models: D40, d45, d50, d60, d62, d65, d70
util.isDef
Description
Returns true if the supplied variable is defined, false if it is not defined (undefined).
Basic Example:Â
util.isDef(var); |
Note: if the variable you are testing has not been declared in anyway, this will throw an exception. If it has been declared but iniitalized as undefined (e.g., not set in any way), the code will process.
Parameters
Name | Required | Type | Default | Description |
|---|---|---|---|---|
var | Yes | variable | Â | Variable to be checked for definition. |
Â
Examples
util.isDef returns true or false
var declaredUndef;
var str = 'foo';
var obj = {'test1' : 'abc'};
util.isDef(str);Â Â Â // returns true
util.isDef(obj.test1);Â // returns true
util.isDef(obj.test2);Â // returns false
util.isDef(declaredUndef); // false
util.isDef(nonDeclaredVariable); // throws exception |