无法显示Ajax值

Question

I have a problem with my ajax, it can't display data from database.

Controller

public function rating() {
 $rating = $this->db->select_avg('hasil_rating')
                    ->get('tb_rating')->row_array();
 echo json_encode($rating);
}

Ajax

function rate() {
 $.ajax({
  type: 'POST',
  url: '<?php echo base_url()."rate/rating"?>',
  dataType: 'json',
  success: function(data) {
    $('#aaaa').val(data);
  }
});

input

<input id="aaaa" type="text" value="">

when I used val() the result is [object Object] and when I used html() the result is empty . But when I use console.log(data) it works.

Answer 1

Just convert json object to string and it will work.

$('#aaaa').val(data.someVar);

For example,

var jsonVal = {val1:'one',val2:'two'};
alert(jsonVal); // it will print [object][object]
alert(jsonVal.val1); // one
alert(jsonVal.val2); // two
alert(JSON.stringify(jsonVal)) // it will print {val1:'one',val2:'two'}

Hope it will help you.

Answer 2

You need to first decode the json in your ajax success.

Use this.

function rate() {
 $.ajax({
  type: 'POST',
  url: '<?php echo base_url()."rate/rating"?>',
  dataType: 'json',
  success: function(data) {
    var d = $.parseJSON(data);
    $('#aaaa').val(d.value);
  }
});

Using this you can access different values from data and set the value in your html.

Update

In your controller you can return the value using json_encode like

echo json_encode(array("success"=>true,"msg1"=>"test ajax","msg2"=>"test ajax 2"));

In your ajax success function to get the value of msg1 you can use

var d = $.parseJSON(data);
alert(d.msg1); //will return "test ajax"
alert(d.msg2); //will return "test ajax 2"

By this way you can access each and every value from your json object.

Answer 3

You have to require $.pasrseJSON before use the data

function rate() {
 $.ajax({
  type: 'POST',
  url: '<?php echo base_url()."rate/rating"?>',
  dataType: 'json',
  success: function(data) {
    data=$.parseJSON(data);
    $('#aaaa').val(data.var_name);
  }
});