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Call function

Posted on 2013-12-15
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Last Modified: 2013-12-31
Is it possible to call a function from within a function? But if function isnt declared do nothing?

function showUrlInDialog(options){
     (options.onOpen || function () { /*Do nothing*/ });
     }

showUrlInDialog({
     myValue1:27,
     myValue2:45,
     onOpen: function () { alert('hello'); }
     });

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Question by:tonelm54
3 Comments
 
LVL 53

Assisted Solution

by:COBOLdinosaur
COBOLdinosaur earned 1000 total points
ID: 39720554
No problem if it is a named function:

if(typeof someFunction == 'function') {
    someFunction();
}

If the function is not defined as a function the the execution drops out of the if or you can use an else  to return a false if you wish.

Cd&
0
 
LVL 31

Accepted Solution

by:
Alexandre Simões earned 1000 total points
ID: 39720907
Here's a solution for your problem with 3 possible input scenarios.
1. No function at all, not even the property is declared
2. The onOpen is declared but it's not a function
3. onOpen is declared and is a function

Live sample: http://jsfiddle.net/AlexCode/yPB9H/

function showUrlInDialog(options) {
    options = options || {};
    
    if(options.onOpen && typeof options.onOpen === 'function')
        options.onOpen();
    else {
        // you can just return false or undefined here as best describes your logic
        alert('no function!');
    }
}

showUrlInDialog({
    myValue1: 27,
    myValue2: 45
});

showUrlInDialog({
    myValue1: 27,
    myValue2: 45,
    onOpen: 123
});

showUrlInDialog({
    myValue1: 27,
    myValue2: 45,
    onOpen: function () { alert('hello'); }
});

Open in new window

0
 
LVL 9

Expert Comment

by:Sar1973
ID: 39720990
You will get an undefined error if you have not declared the function before.
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