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json javascript array question about  array referance

Posted on 2009-05-18
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Last Modified: 2013-11-08
Hi,


I am using JSON and eval to get an array of objects, like this:
{"location":[ {"loc_id":  "76",
                                    "description": "test",
                                    "company": "testrco",
then eval in javascript so var loc = eval........

The loc_id is a unique no., can i use this as the array no? I want to add to the array and change some of the values "description" for example would be god if i could reference it like
loc.location.loc[76].description instead of loc.location[2].description where the 2 doesn't relate to anything.

Hope I am making sense....

Thanks,
Ewan
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Question by:ewan69
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4 Comments
 
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Expert Comment

by:moagrius
ID: 24412939
natively, no - 76 is a value, not a key.  however, you could write a simple loop to create an array for reference and assign key by loc_id
var list = [];
for(var i=0;i<loc.location.length;i++){
var ref = loc.location[i];
var id = ref.loc_id;
list[id] = ref;
}

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Author Comment

by:ewan69
ID: 24413183
Hi moagrius,

Thanks for the quick reply, sorry for not using the right terminoligy, still learing....

I will try your code in a minute thanks, is there a better way of doing things?

I want to be able to periodically update the array elements from a database so i was thinking if the PRIMARY KEY value was used as the array key, using eval i could easily replace the old element with the new.

Is there a better way of doing it?? maybe loop through the array and see if loc.location[i].loc_id == the loc_id of the update, if it does then replace that element with the new one.

not sure if element is the right word, i mean one of the whole objects in the array.

Thanks,

Ewan
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Accepted Solution

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moagrius earned 500 total points
ID: 24413476
Looping through the array and checking the loc_id is a good approach too - either way works really.  Just a note, in the above example code I gave before, you'd then look up the element using list[76] - "list" would contain the order copy of the location array.
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Author Closing Comment

by:ewan69
ID: 31582630
Thanks for your help... :)
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