Object Is Undefined Error In Javascript
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a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up javascript object is undefined? up vote 1 down vote favorite I'm getting "map is
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undefined", not sure why. Am I passing a wrong variable, or is myMap wrongly declared? var myMap = new Object(); $(things).each(function(){ var thing= this.attributes.things.Value; alert("thing= " + thing); var totalThings= myMap[thing]; alert("totalThings= " + totalThings); }); javascript share|improve this question edited Sep 5 '13 at 12:07 Roko C. Buljan 91.2k15126165 asked Sep 5 '13 at 12:01 Doc Holiday 2,5011847103 2 It seems like you're accessing thing field of an empty javascript object property undefined object: myMap[thing] –mishik Sep 5 '13 at 12:03 What error message exactly are you getting? myMap looks OK apart from that you could have shortened the constructor invocation to a {} literal –Bergi Sep 5 '13 at 12:04 1 I don't see anything called map in that snippet. –Ingo Bürk Sep 5 '13 at 12:04 true that, what is thing by the way? –kangoroo Sep 5 '13 at 12:04 @kangoroo thing is a string –Doc Holiday Sep 5 '13 at 12:06 | show 1 more comment 3 Answers 3 active oldest votes up vote 4 down vote accepted Chances are myMap is defined, but myMap[thing] is not (since it's a virgin object with no properties). And since you're getting the value (and not setting it) you're getting an error. // virgin object var myObj = new Object(); console.log(JSON.stringify(myObj)); // "{}" // therefore property "foo" doesn't exist console.log(myObj['foo']); // undefined // but if we add it: myObj['foo'] = 'bar'; // now it exists console.log(myObj['foo']); // "bar" share|improve this answer answered Sep 5 '13 at 12:04 Brad Christie 75.1k994142 yo are the man....thanks –Doc Holiday Sep 5 '13 at 12:13 "And since you're getting the value (and not setting i
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