looping through JSON object checking key values

Question

Trying to run the following code

var superGroup = $.parseJSON(data);
$.each(superGroup, function(idx, obj) {
            if (idx.contains("Addr_Line")) {
                if (obj != null) {
                    currentAddress.push(obj);
                }
            }
        });

Where supergroup is a JSON object with a bunch of properties and I basically only want to add the values of the properties in this object which contain "addr_line". In chrome I noticed there is a JS error on

idx.contains()

Saying idx does not contain a method contains

Any idea how I can get around this ?

In this case, idx will either be a string or a number. Neither of which have a .contains() method. EDIT: String.contains() exists, but nothing (except Firefox) supports it. — gen_Eric
– gen_Eric, Commented Jan 28, 2014 at 20:33
When I did a alert(idx), it showed all the property names of my object i.e id,blah,Address_Line_1,Address_Line_2, etc the code seemed to work in firefox but chrome didnt like it — StevieB
– StevieB, Commented Jan 28, 2014 at 20:35
You could have easily answered this question yourself by reading the docs. — Blazemonger
– Blazemonger, Commented Jan 28, 2014 at 20:35

grim · Accepted Answer · 2014-01-28 20:34:15Z

2

This is because String.prototype.contains() is not supported in Chrome: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/contains

Just do this:

$.each(superGroup, function(idx, obj) {
    if (idx.indexOf('Addr_Line') !== -1) {
        if (obj != null) {
            currentAddress.push(obj);
        }
    }
});

You might also want to check if idx is a string:

$.each(superGroup, function(idx, obj) {
    if (typeof idx == 'string' && idx.indexOf('Addr_Line') !== -1) {
        if (obj != null) {
            currentAddress.push(obj);
        }
    }
});

answered Jan 28, 2014 at 20:34

grim

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Comments

Blazemonger · Accepted Answer · 2014-01-28 20:37:05Z

1

According to the docs for String.contains, you can polyfill this Firefox-only method by adding the following code:

if (!('contains' in String.prototype)) {
  String.prototype.contains = function(str, startIndex) {
    return -1 !== String.prototype.indexOf.call(this, str, startIndex);
  };
}

answered Jan 28, 2014 at 20:37

Blazemonger

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