JSON element detection

Question

I’ve created a string…

{"atts": [{"name": "wedw"}, {"type": "---"}]}

I pile a bunch of these together in an array based on user input and attach them to another string to complete a JSON object that tests out as valid.

So I end up with a global array called fields with a bunch of these little snippets.

So how do I change the name "weds" with a new name? I’ve tried...

function changefieldname(pos){
var obj = JSON.parse(jsonstring);
var oldname = obj.tracelog.fields[pos].atts[0]["name"];
var newname = document.getElementById("newlogfieldname"+pos).value;
fields[pos].replace(oldname, newname);
//writejson();
}

And a bunch of variations. I know everything is checking out correct interms of the variables pos, oldname, and newname. I also know that fields[pos] returns the string in the array I want to correct but it’s not happy. I also tried converting fields[pos] to a string, but the replace function doesn't work on it. I’m sure there is a good reason.

Shouldn't it simply be obj.tracelog.fields[pos].atts[0].name = newname? — Phil
– Phil, Commented May 27, 2014 at 3:22
Not the way it is written. The fields are defined globally and continuously replace a portion of the tracelog string. But your observation makes me wonder if that makes any sense, and that the fields should be defined within the function. It would make your suggestion work, and probably be cleaner. thanks' — Skinner
– Skinner, Commented May 27, 2014 at 3:32

Shomz · Accepted Answer · 2014-05-27 03:32:11Z

1

Why even bother trying to do some kind of replacement? Just assign it a new value:

obj.tracelog.fields[pos].atts[0]["name"] = newname;

edited May 27, 2014 at 3:32

answered May 27, 2014 at 3:24

Shomz

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