使用jQuery循环并获取JSON数组的键/值对

Question

I'm looking to loop through a JSON array and display the key and value.

It should be a simplified version of the following post, but I don't seem to have the syntax correct: jQuery 'each' loop with JSON array

I also saw the post Get name of key in key/value pair in JSON using jQuery? , but it also seemed like lots of code for a simple activity.

This illustrates what I'm looking for (but it doesn't work):

var result = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
$.each(result, function(k, v) {
             //display the key and value pair
            alert(k + ' is ' + v);
        });

There is no mandatory jQuery requirement, but it is available. I can also restructure the JSON if it cuts down the required code.

Answer 1

You have a string representing a JSON serialized JavaScript object. You need to deserialize it back to a JavaScript object before being able to loop through its properties. Otherwise you will be looping through each individual character of this string.

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
var result = $.parseJSON(resultJSON);
$.each(result, function(k, v) {
    //display the key and value pair
    alert(k + ' is ' + v);
});

Live demo .

Answer 2

var obj = $.parseJSON(result); for (var prop in obj) { alert(prop + " is " + obj[prop]); }

Answer 3

You can get the values directly in case of one array like this:

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
var result = $.parseJSON(resultJSON);
result['FirstName']; // return 'John'
result['LastName'];  // return ''Doe'
result['Email']; // return 'johndoe@johndoe.com'
result['Phone'];  // return '123'

Answer 4

The following should work for a JSON returned string. It will also work for an associative array of data.

for (var key in data)
     alert(key + ' is ' + data[key]);

Answer 5

Parse the JSON string and you can loop through the keys.

 var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}'; var data = JSON.parse(resultJSON); for (var key in data) { //console.log(key + ' : ' + data[key]); alert(key + ' --> ' + data[key]); } 

Answer 6

The best and perfect solution for this issue:

I tried the jQuery with the Ajax success responses, but it doesn't work so I invented my own and finally it works!

Click here to see the full solution

var rs = '{"test" : "Got it perfect!","message" : "Got it!"}';
eval("var toObject = "+ rs + ";");
alert(toObject.message);