获取特定的数组值javascript

Question

I'm not sure if I'm just being silly, although I wasn't able to find this anywhere, but I am json_encode() ing some database outputs and outputting them to the page, and reading them using $.parseJSON , but I want to get a specific value from the array. Here is an example of what I'm trying to accomplish.

var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]';

var json = $.parseJSON(j);
$(json).each(function(i, val) {
  $.each(val, function(k, v) {
    console.log(k['uid']) // <-- This is where I want to just output the UID from each array results
});

Now, to put into words what I'd like to accomplish is to just pull the UID (or name or profile_img, just a value in general) from this array, so I can later insert the values into a div.

Any help is much appreciated, thank you!

Answer 1

• No need to use nested .each as there is no nested array.
• Second argument in callback (A function to execute for each element) is the item iterated in the current loop, not the first argument.

 var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]'; var json = $.parseJSON(j); $(json).each(function(i, val) { console.log(val['uid']); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> 

I would have avoided jQuery for this manipulation.

 var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]'; var parsed = JSON.parse(j); var uids = parsed.map(function(item) { return item.uid; }); console.log(uids); 

Answer 2

No 2nd level of each is required.

try this:

 var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]'; var json = $.parseJSON(j); $.each(json, function (i, obj) { console.log(obj.uid); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 

Answer 3

try this :-

using JS only:

var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]';
j = JSON.parse(j);
j.map((value)=>{
    console.log(value['uid'])
});

With jQuery:-

var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]';

var json = $.parseJSON(j);
$(json).each(function(i, val) {
  console.log(val['uid']);
});

Answer 4

After parsing your json object to an array list you can just use vanilla map function as below

function stuff(item,index) {
    //Here can do any manipulation with your object
    return item.uid;
}

function myFunction() {
    document.getElementById("myDiv").innerHTML = myArrayList.map(stuff);
}

Answer 5

This may be of help to you.

   var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]';

        var json = $.parseJSON(j);
        var l=json.length;
        var arr=[];
        for(var i=0;i<l;i++){
            arr.push(json[i]['uid']);
        }
        console.log(arr);//you can use this array for whatever purpose you intend to

Answer 6

Not necessaray use Jquery!

var j = '[{"uid":"1","name":"Bingo Boy", "profile_img":"funtimes.jpg"},{"uid":"2","name":"Johnny Apples", "profile_img":"badtime.jpg"}]';
var parsedJson = JSON.parse(j);
var uidsArray = parsedJson.map( function(entry){
   return entry.uid;
});

console.log(uidsArray); // output: [1,2]