未定义索引ajax / php

Question

Hi I am getting the following error when I call action in controller from ajax.

Undefined index : value.

This is my code in Document Ready

unique function is to create array of unique elements.

                var modules =[];
                var action = [];
                var max_limit=[];
                var details ={};

$(".btn-small").click(function()
        {
        modules = unique(modules);
        action = unique(action);
        limit = unique(limit);

        details['id'] = id;
        details['cost'] = sum;
        details['modules'] = modules;
        details['action'] = action;
        details['limit'] =  limit;

        jsonString = JSON.stringify(details);







   $.ajax({ 
     url: "<?php echo Yii::app()->createUrl('/xxxxxxxx/actionDemo'); ?>",
     data: {'value':jsonString },
     type: 'post',
     dataType:'json',
     success: function() {
                  alert("st");
              },
      error: function(){
        alert("Error: Could not delete");
      }
});

This is my code in action in Controller :

public function actionDemo() {

        $val = $_POST['value'];
        var_dump($val);
        die();
}       

Answer 1

It means that "value" is not in you post data. Try to dump your POST and see what is going on.

This is probably because you are sending a JSON, so you POST will contain a JSON instead of an Array.