CODEWITHSUNDEEP
javascriptjquery
Haroldas
Haroldas

Reputation: 1010

How to check if function exist?

How to check if is function on jquery, but function is in another .js file?

validation.js:

if ($.isFunction('payment')) {
    $('[data-numeric]').payment('restrictNumeric');
    $('.cc-number').payment('formatCardNumber');
    $('.cc-exp').payment('formatCardExpiry');
    $('.cc-cvc').payment('formatCardCVC');
}

this is false because func payments is in the payments.js .

Upvotes: 20

Views: 56526

Answers (4)

Haroldas
Haroldas

Reputation: 1010

problem is solved. its works:

if ($.fn.payment) {
    //do something
}

Upvotes: 23

VVV
VVV

Reputation: 7593

You can check if a function exists using window

For example

var fn = window['NameOfTheFunction']; 
if(typeof fn === 'function') {
    doSomething();
}

If your function in payment.js is part of a self contained function, you need to set it to so the window object can "see" it by adding this in your self contained function:

window.NameOfTheFunction = NameOfTheFunction;

Upvotes: 6

Shijin TR
Shijin TR

Reputation: 7768

Try to check like as follows,

 if (typeof payment !== 'undefined' && $.isFunction(payment)) {
    $('[data-numeric]').payment('restrictNumeric');
    $('.cc-number').payment('formatCardNumber');
    $('.cc-exp').payment('formatCardExpiry');
    $('.cc-cvc').payment('formatCardCVC');
 }

Upvotes: 9

Anik Islam Abhi
Anik Islam Abhi

Reputation: 25352

Try like this 

if (typeof payment === "function")
{
  // Do something
}

Upvotes: 40

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