javascript jQuery get object key

Question

I have the following code:

!function($){

    $.keys = {
        backspace: 8,
        tab: 9,
        enter: 13,
        escape: 27,
        space: 32,
        pageUp: 33,
        pageDown: 34,
        end: 35,
        home: 36,
        left: 37,
        up: 38,
        right: 39,
        down: 40,
        delete: 46,
        numpadEnter: 108,
        comma: 188
    };

}(window.jQuery);

And I want to build a function that returns a string of a key code for example:

$.keys.toString = function(key){
  switch(key){
    case $.keys.backspace:
      return 'backspace';
  }
};

The list would ofcourse be bigger, and support all the keys of the $.keys object. But is there a possibility that the $.keys.toString function actually uses the $.keys array to convert the int to string, so I don't have to make a switch statement.

Something like getKeyFromObjectValue?

Thanks for help :)

pimvdb · Accepted Answer · 2012-07-19 11:47:05Z

5

Since the list of keys is constant, you could simply create another list by iterating and reversing:

$.keysReversed = {};
$.each($.keys, function(key, value) {
  $.keysReversed[value] = key;  // value as key, key as value
});

Now, $.keysReversed contains of number/name pairs. This is faster than doing magic each time you call .toString - you can just return $.keysReversed[key].

answered Jul 19, 2012 at 11:47

pimvdb

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Comments

onlineracoon · Accepted Answer · 2012-07-19 14:55:39Z

1

$.keys.toString = function(key){
    $.each($.keys, function(key, value){
        if(value === key){
            return key;
        }
    });
};

Thanks for help :)

answered Jul 19, 2012 at 14:55

onlineracoon

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1 Comment

pimvdb Over a year ago

Returning in $.each doesn't have toString return something.

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