Parsing a JSON string to array, not object

I've got a PHP array and echo that into javascript with json encode, i need to do it this way because it's going to be very dynamic. This is the code it echo's:

开发者_开发技巧{"notempty":true}

And i use this to, convert it to javascript:

var myarray = eval('(' + json + ')');

For some reason it creates an object instead of an array and for that reason i cant use .length or a for loop.

Does someone know what im doing wrong here?

Thanks

You're trying to treat an Object like an Array, and an Object is not an Array, it is an Object.

Any time you see {} in JSON, that means "What is contained within these hallowed brackets is a dynamic object". When you see [], that means "Behold! I am an Array" (there are notable exceptions to this one: jQuery does some special work with to make itself look like an array).

So, in order to iterate through an Object, you'll want to use for... in.

// eval BAD unless you know your input has been sanitized!.
var myObj = JSON.parse('{"notempty":true}');
// personally, I use it in for... in loops. It clarifies that this is a string
// you may want to use hasOwnProperty here as sometimes other "keys" are inserted
for( var it in myObj ) console.log( "myObj["+it+"] = " + myObj[it] );

{} is an object, which contains one attribute named notempty. If you want an array, it'd have to be

[{"notempty":true}]

which is an array with a single element at index 0, which is an object with the single attribute 'notempty';.

By default, if you use encode an assoc array in php, it will become a js object when you decode. In order to have it be an array, you need to make it an array in php:

PHP:

$arr = "['notempty','notempty2','notempty3']";

Otherwise, you should convert it to an array in JS, but that seems to me a waste since looping through the object in javascript is so much easier:

Javascript:

var arr = new Array();
for(var i in obj) arr[i] = obj[i];

You can use jQuery to parse it into an array like this:

var p = [];
$.each(jsonData, function (key, val) {
    p.push([val.propertyOne, val.propertyTwo]);
});

I am presuming of course that you want to parse JSON, not an array or any other string.