CODEWITHSUNDEEP
javascriptobject
John Smith
John Smith

Reputation: 105

How to Iterate through all object properties

I want Iterate through all object properites. I was trying to do this by using 

for( var key in obj)

But that didnt give me all properties. For example, there is no key 'click'. But when i try to do 

obj['click']

i got something.

I am trying to do this on IE7

Upvotes: 3

Views: 3348

Answers (2)

Mike 'Pomax' Kamermans
Mike 'Pomax' Kamermans

Reputation: 53705

For/in runs over all enumerable properties, including those inherited from ancestor prototypes. If you just want the ones for "your object", use Object.keys():

Object.keys(yourobject).forEach(function(propertyName) {
  var value = yourobject[propertyName];
  console.log(propertyName + ":", value);
});

Upvotes: 1

kamituel
kamituel

Reputation: 35970

The for .. in loop iterates over all enumerable properties, not over all properties.

So I would suspect either the click is not enumerable or you missed something.

Example on how to set a property which will not be available via the for .. in loop:

var obj = {};

Object.defineProperty(obj, "stealth", {
  enumerable: false,
  value: "you don't iterate over me"
});

// obj.stealth === "you don't iterate over me"

for (var i in obj) {
  // Loop will not enter here
}

You can test whether property is enumerable (i.e. will be accessible in a for .. in loop) using Object.propertyIsEnumerable() method:

obj.propertyIsEnumerable('stealth') === false

Upvotes: 3

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