CODEWITHSUNDEEP
javascriptjsonparsing
joelc
joelc

Reputation: 2751

JSON.parse to an object array

I'm having a difficult time with something that should be (and probably is) pretty basic. I have a constructor as follows:

function search_table(v1, v2, v3) {
    this.field = v1;
    this.condition = v2;
    this.value = v3;
}

My application has an array of search_table which gets JSON.stringify(ied) and then stored in localStorage.

My question is... when I retrieve the object from localStorage, it's in JSON string format. How do I get it back into the search_table[] format?

I'd prefer to do this without jQuery if possible. Thanks

I've tried to use something like the following:

var search_array = JSON.parse(string_val);

But it doesn't allow me to access search_array[i].condition as an example.

Upvotes: 2

Views: 7371

Answers (1)

ziesemer
ziesemer

Reputation: 28687

This should work. The following code:

function search_table(v1, v2, v3) {
    this.field = v1;
    this.condition = v2;
    this.value = v3;
}
var arr = [new search_table(1, 2, 3), new search_table(4, 5, 6), new search_table(7, 8, 9)];

var str = JSON.stringify(arr);
console.log("stingified: ", str);

var search_array = JSON.parse(str);
var result = search_array[1].condition;
console.log("result: ", result);

Gives the following output:

stingified: [{"field":1,"condition":2,"value":3},{"field":4,"condition":5,"value":6},{"field":7,"condition":8,"value":9}]
result: 5

Your issue is elsewhere in the code that you haven't included here.

I'd also check Travis's suggestion - does your browser have native support for the JSON functions? Try these, and make sure they don't return "undefined":

alert(JSON.stringify);
alert(JSON.parse);

Also, make sure you initialized i, and that it is in-bounds of your array.

Upvotes: 2

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