How to change value inside a JSON string

Question

I have a ~~JSON~~ ~~string~~ array of objects like this.

[{"id":"4","rank":"adm","title":"title 1"},
{"id":"2","rank":"mod","title":"title 2"},
{"id":"5","rank":"das","title":"title 3"},
{"id":"1","rank":"usr","title":"title 4"},
{"id":"3","rank":"ref","title":"title 5"}]

I want to change the title value of it, once the id is matching. So if my variable myID is 5, I want to change the title "title 5" to new title, and so on. And then I get the new JSON array to $("#rangArray").val(jsonStr);

Something like

$.each(jsonStr, function(k,v) {
    if (v==myID) {
        this.title='new title'; $("#myTextArea").val(jsonStr);
    }
});

Here is the full code.

$('img.delete').click(function() {
var deltid = $(this).attr("id").split('_');
var newID = deltid[1];
var jsonStr = JSON.stringify(myArray);
$.each(jsonStr, function(k,v) {
if (v==newID) {
// how to change the title
jsonStr[k].title = 'new title';
alert(jsonStr);
$("#rangArray").val(jsonStr);
}
});
});

The above is not working. Any help please?

You have a syntax error in your array literal: you have two commas ,, in row two. — Šime Vidas
– Šime Vidas, Commented Feb 17, 2011 at 14:48

Šime Vidas · Accepted Answer · 2011-02-17 18:25:30Z

1

Try this:

$.each(jsonStr, function(i,v) {
    if ( v.id == myID ) {
        v.title = 'new title';
        return false;
    }
});

Live demo: http://jsfiddle.net/CVvW4/1/

Full snipped (with my code implemented):

$('img.delete').click(function() {
    var newID = $(this).attr('id').split('_')[1];

    $.each(myArray, function(i,v) {
        if ( v.id == newID ) {
            v.title = 'new title';
            $('#rangArray').val(jsonStr);
        }
    });
});

edited Feb 17, 2011 at 18:25

answered Feb 17, 2011 at 14:44

Šime Vidas

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4 Comments

Jeremy Roy Over a year ago

Thanks Sime, but here > if ( jsonStr[k].id == v ) { I need to compare the value of v with a previously defined variable. What do you think.

Jeremy Roy Over a year ago

@Šime Vidas Many many thanks. I really appreciate for your help (and sorry for the delayed reply, I had to go out for some work suddenly). It's good, but I have this issue of "undefined". In the line if (v.id == newID) { I am getting the value of v.id as undefined, and hence the whole if condition is not getting executed. Any idea on this?

Šime Vidas Over a year ago

@Jeremy I've updated my code. Try now. (I've passed the myArray variable into the $.each method directly.)

Jeremy Roy Over a year ago

@Šime Vidas Cool, and this solves the problem wonderfully. Many many thanks once again, Sime. :)

Sachin Shanbhag · Accepted Answer · 2011-02-17 14:20:52Z

0

You should be doing jsonStr[v].title = "new title";

Your jsonStr is an array of objects.

answered Feb 17, 2011 at 14:20

Sachin Shanbhag

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Comments

ThiefMaster · Accepted Answer · 2011-02-17 14:37:38Z

0

Try using jsonStr[k].title = 'new title';

edited Feb 17, 2011 at 14:37

answered Feb 17, 2011 at 14:19

ThiefMaster

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1 Comment

Jeremy Roy Over a year ago

Thanks for the new one, but it's still not working. or probably, it's working but I'm not able to see it, in #myTextArea or even using an alert just after jsonStr[k].title = 'new title'; alert(jsonStr);. I have even tried jsonStr[2].title = 'new title'; (replacing k with 2, just to check if that changes the 3rd element of the array), it's not.

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