jQuery.type()

jQuery

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jQuery.type()

Categories: Utilities

jQuery.type( obj ) Returns: String

Description: Determine the internal JavaScript [[Class]] of an object.

  • version added: 1.4.3jQuery.type( obj )

    • obj
      Type: PlainObject
      Object to get the internal JavaScript [[Class]] of.

A number of techniques are used to determine the exact return value for an object. The [[Class]] is determined as follows:

  • If the object is undefined or null, then "undefined" or "null" is returned accordingly.
    • jQuery.type( undefined ) === "undefined"
    • jQuery.type() === "undefined"
    • jQuery.type( window.notDefined ) === "undefined"
    • jQuery.type( null ) === "null"
  • If the object has an internal [[Class]] equivalent to one of the browser's built-in objects, the associated name is returned. (More details about this technique.)
    • jQuery.type( true ) === "boolean"
    • jQuery.type( 3 ) === "number"
    • jQuery.type( "test" ) === "string"
    • jQuery.type( function(){} ) === "function"
    • jQuery.type( [] ) === "array"
    • jQuery.type( new Date() ) === "date"
    • jQuery.type( new Error() ) === "error" // as of jQuery 1.9
    • jQuery.type( /test/ ) === "regexp"
  • Everything else returns "object" as its type.

Example:

Find out if the parameter is a RegExp.

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                                        <!DOCTYPE html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <head>
                                      
                                    

                                  

                                  

                                    

                                        <script src="http://code.jquery.com/jquery-latest.js"></script>
                                    

                                  

                                  

                                    

                                      
                                        </head>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <body>
                                      
                                    

                                  

                                  

                                    

                                        Is it a RegExp? <b></b>
                                    

                                  

                                  

                                    

                                      
                                        <script>
                                        $("b").append( "" + jQuery.type(/test/) );
                                        </script>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        </body>
                                      
                                    

                                  

                                  

                                    

                                      
                                        </html>
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