How to get Name of a JSON field based on the Value in JavaScript?

Question

I have the following JSON File:

   "fields": {
        "x1": {
            "name": "AnExteremLongName"
        },
        "x2": {
            "name": "AnotherExteremLongName"
        },
    },"row": [
        {
            "x1": {
                "name":"Some random Text"
            },
            "x2": {
                "name":"Other random Text"
            }
        }, ....

This is basically a table and to reduce the size of the Json file, the names are extraced into this x values.

I want to get the the Value of "AnExteremLongName" so I have to first get the representive X value. How can I do this without reading all varibles and store them into a "Hashmap"

So basically something like:

String getParamNamebyValue(String ParamValue);

I suppose you'll have to iterate, as this is backwards from how it's designed to work. Imagine you just have a phonebook and a certain number, and you need to look up the name associated with that number. It's kinda like that. — Wiseguy
– Wiseguy, Commented Aug 23, 2011 at 12:21
@Stefan: what would you exactly expect as the return value of getParamNamebyValue("AnExteremLongName")? "fields.x1"? And what if "AnExteremLongName" appears multiple times in the json string? — Jiri Kriz
– Jiri Kriz, Commented Aug 23, 2011 at 13:07

Rahman Kalfane · Accepted Answer · 2011-08-23 12:24:56Z

2

You'll have to iterate through the object properties using for in and compare them. But it is not really fast and I would not recommend it.

Something like this.

answered Aug 23, 2011 at 12:24

Rahman Kalfane

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3 Comments

Stefan Over a year ago

yes, I think so too... would it be better to send the list without this optimization, even if the paramternames could take >10 characters?

Tigraine Over a year ago

I'd suggest you don't optimize this in your code but rather just compress the Json you send out. If those things repeat themselves a lot the compression will bring the size down..

Rahman Kalfane Over a year ago

+1 for compression. JSON has a quite light footprint so if it's still too large you'll have to work on your data and make use of hashing, pagination to optimize your application.

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