CODEWITHSUNDEEP
javascriptjquery
Tx3
Tx3

Reputation: 6916

How to detect is argument jQuery object

I want to create function that can be used either with Id or by passing jQuery object.

var $myVar = $('#myId');

myFunc($myVar);
myFunc('myId');

function myFunc(value)
{
    // check if value is jQuery or string
}

How can I detect what kind of argument was passed to the function?

Note! This question is not same. I don't want to pass selector string like #id.myClass. I want to pass the jQuery object like in the example.

Upvotes: 10

Views: 8240

Answers (7)

raddrick
raddrick

Reputation: 4453

function myFunc(value)
{
  if(typeof(value) == 'string')
    //this is a string
  else if (value === jQuery)
    //this is jQuery
  else if (typeof(value) == 'object')
    //this is an object
}

NOTE: did this in the console:

> jQuery
function (a,b){return new e.fn.init(a,b,h)}
> var value = jQuery
undefined
> value
function (a,b){return new e.fn.init(a,b,h)}
> value === jQuery
true

Upvotes: 0

Marc
Marc

Reputation: 11633

function myFunc(value)
{
   if (typeof value == "string") {
      //it's a string
   }
   else if (value != null && typeof value == "object"} {
      //it's an object (presumably jQuery object)
   }
   else {
      //it's null or something else
   }


}

Upvotes: 1

Eva
Eva

Reputation: 5077

Try using typeof, eg:

var $myVar = $('#myId');

myFunc($myVar);
myFunc('myId');

function myFunc( value ){
    // check if value is jQuery or string
    switch( typeof value ) {
        case 'object':
        // is object
        break;

        case 'string':
        // is string
        break;

        // etc etc.
    }
}

Upvotes: 0

Parth Thakkar
Parth Thakkar

Reputation: 5475

Every jquery object has a property jquery. This will fail, of course, if your object has jquery property...but you can have stricter checking if you want...

function(o) {
    if(typeof o == 'object' && o.jquery) // it's jquery object.
}

Upvotes: 3

Ilya Shpakovsky
Ilya Shpakovsky

Reputation: 291

Try this:

function myFunc(value)
{
   if(typeof value === 'object') {
   }
   else{
   }
}

Upvotes: 0

BenM
BenM

Reputation: 53228

Would it not be sufficient to check the type of the argument?

function myfunc(arg)
{
    if(typeof arg == 'string')
    {

    }
    else if(typeof arg == 'object')
    {

    }  
}

Check this Fiddle.

Upvotes: 0

Sirko
Sirko

Reputation: 74076

Use the typeof operator

if ( typeof value === 'string' ) {
  // it's a string
} else {
  // it's something else
}

Or to make really sure it's an instance of the jQuery object

if ( typeof value === 'string' ) {
  // it's a string
} else if ( value instanceof $) {
  // it's a jQuery object
} else {
  // something unwanted
}

Upvotes: 18

Related Questions