Find property name from value in jscript

Question

I'm trying to get a property name if I know value from object defined as

expOperators = {
    "0": "Select operator",
    "GREATERTHAN": "After",
    "LESSTHAN": "Before",
    "GREATERTHANEQUALTO": "On or After",
    "LESSTHANEQUALTO": "On or Before",
    "EQUALS": "On",
    "BETWEEN": "Between",
    "ISNULL": "Is Null",
    "ISNOTNULL": "Is not Null"
};

Obviously if I need to find value it would be easy, but I need to accomplish an opposite task, knowing value find out what is the property. Any idea?

I can't help but think there may be a more efficient way of doing this? — Fergus In London, Nov 15 '12 at 07:26

score 0 · Answer 1 · edited Nov 14 '12 at 22:01

0

You'll have too loop through the object and compare the object values to what you're looking for.

expOperators = {
    "0": "Select operator",
    "GREATERTHAN": "After",
    "LESSTHAN": "Before",
    "GREATERTHANEQUALTO": "On or After",
    "LESSTHANEQUALTO": "On or Before",
    "EQUALS": "On",
    "BETWEEN": "Between",
    "ISNULL": "Is Null",
    "ISNOTNULL": "Is not Null"
};

for(var name in expOperators ) {
    if(expOperators[name] === "Between"){
        document.write(name);
    }
}

http://jsfiddle.net/WsjyS/2/

edited Nov 14 '12 at 22:01

cillierscharl

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answered Nov 14 '12 at 21:57

bluetoft

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2

consider including `hasOwnProperty` http://stackoverflow.com/questions/684672/loop-through-javascript-object – cillierscharl Nov 14 '12 at 21:59

score 0 · Answer 2 · answered Nov 15 '12 at 06:13

0

use something like this

 for(var name in expOperators ) {
    if(expOperators.hasOwnProperty(name)){
      if(expOperators[name] === "Between"){
         alert(name);
       }
    }
}

answered Nov 15 '12 at 06:13

rajesh kakawat

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Find property name from value in jscript

2 Answers2