Error Is Undefined Javascript
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Javascript Error Object Undefined
Sign up Javascript Runtime error: $ is undefined up vote 6 down vote favorite 4 I have added script in my Default.aspx page. I am getting following error. javascript jquery asp.net share|improve this question edited Jul 15 '13 at 5:19 asked Jul
Javascript Error Undefined Is Not A Function
14 '13 at 8:49 Ajay Punekar 3,83774080 add a comment| 5 Answers 5 active oldest votes up vote 21 down vote accepted $ is defined by jQuery, which you probably haven't referenced. A simple way to get it is to add one of the CDN urls to your template HTML: share|improve this answer answered Jul 14 '13 at 8:51 Marcelo Cantos 117k21236290 so I need to remove $ ? I have added path of my script but not works sys is undefined javascript error –Ajay Punekar Jul 14 '13 at 8:54 @Ajay: No. $ is missing. That's what '$' is undefined means. You need to include jQuery, which defines $ for you, in order to make your code work. –Marcelo Cantos Jul 14 '13 at 8:55 @Ajay: Just to be clear, the code you've pasted into your HTML relies on jQuery. The $ is a short-hand reference to the jQuery object. Removing the $s isn't an option. The code won't work at all if you don't include jQuery. –Marcelo Cantos Jul 14 '13 at 9:01 I added the JQUERY url in both my MasterPage.master and Default.aspx and I am still receiving the error. Any idea how to resolve it? Thanks. –Si8 Jan 23 '14 at 15:20 @SiKni8: Ask a new question. –Marcelo Cantos Jan 24 '14 at 22:49 | show 1 more comment up vote 3 down vote You need to include jQuery: http://learn.jquery.com/about-jquery/how-jquery-works/
("x is not defined") and how best to code against them can be frustrating. This is my attempt to straighten things out a little. If you're not already familiar with the difference between variables and properties in
Pagemethods Is Undefined Javascript Error
JavaScript (including the internal VariableObject) now might be a good time to check javascript alert undefined out my previous posting. What is undefined? In JavaScript there is Undefined (type), undefined (value) and undefined (variable). Undefined (type) javascript array undefined is a built-in JavaScript type. undefined (value) is a primitive and is the sole value of the Undefined type. Any property that has not been assigned a value, assumes the undefined value. (ECMA http://stackoverflow.com/questions/17637870/javascript-runtime-error-is-undefined 4.3.9 and 4.3.10). A function without a return statement, or a function with an empty return statement returns undefined. The value of an unsupplied function argument is undefined. var a; typeof a; //"undefined" window.b; typeof window.b; //"undefined" var c = (function() {})(); typeof c; //"undefined" var d = (function(e) {return e})(); typeof d; //"undefined" undefined (variable) is a global property whose initial value is undefined (value), Since https://javascriptweblog.wordpress.com/2010/08/16/understanding-undefined-and-preventing-referenceerrors/ its a global property we can also access it as a variable. For consistency I'm always going to call it a variable in this article. typeof undefined; //"undefined" var f = 2; f = undefined; //re-assigning to undefined (variable) typeof f; //"undefined" As of ECMA 3, its value can be reassigned : undefined = "washing machine"; //assign a string to undefined (variable) typeof undefined //"string" f = undefined; typeof f; //"string" f; //"washing machine" Needless to say, re-assigning values to the undefined variable is very bad practice, and in fact its not allowed by ECMA 5 (though amongst the current set of full browser releases, only Safari enforces this). And then there's null? Yes, generally well understood but worth re-stating: undefined is distinct from null which is also a primitive value representing the intentional absence of a value. The only similarity between undefined and null is they both coerce to false. So what's a ReferenceError? A ReferenceError indicates that an invalid reference value has been detected (ECMA 5 15.11.6.3) In practical terms, this means a ReferenceError will be thrown when JavaScript attempts to get the value of an unresolvable reference. (There are other cases where a ReferenceErr
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