managing the response from an ajax request

After extensive searching, I have been unable to find a solution. The code snippet below is responsible for making a database request and retrieving data through $.post. Even though the inner function successfully fetches the data, I require it to be accessible outside in order to assign some data to the outputString variable. The necessary steps are evident in the provided code.

    function calculatePrice(checkInDate, checkOutDate, nights){

        var rentDetailsArr       = <?php echo json_encode($periods); ?>;
        var minDays = ["<?php echo implode('","',$minDaysArr)?>"];
        var outputString ="";   

            var stDate  = "2010-02-10";
            var endDate = "2010-09-29";

            var xxx = $.post('testData.php', 
                { opType:"getSelectedPeriodDetails", startDate: stDate, endDate: endDate  }, 
                    function getData(data) {

                        $(data).each (function (index){
                            //I am able to get the data in here.but i need to equal it to outputString variable.
                            var price = data['period_id'][0];
                            //alert(price);
                            alert(price);                               
                        });     
                    },  "json");

        //when I equal $.post return to xxx variable, the return is as [object XMLHttpRequest ]
        alert(xxx);

        return outputString;    
    }

Now how I can handle the data out side?..can handle the data through xxx variable. If I can , how i will parse it? Sorry, if I have used wrong terms in explaining the problem. I am not very familiar with but I still can use.

Answer №1

To assign outputString a value within the ajax callback function, utilize the following syntax:

$(responseData).each (function (i){
    // assigning period_id to outputString
    outputString = responseData['period_id'][0];
});   

Answer №2

When iterating through $(data).each, the price variable will always contain the last index value. If you need to store all index values, you can follow @alififty's advice by storing them in an array called outputString:

var outputString = [];

$(data).each(function(index) {
    // Store price in outputString
    outputString.push(data['period_id'][index]);
});

If you want to perform actions with the results, such as:

var price = calculatePrice("xxxx", "xxxx", "xxxx").Tax();

You can achieve this using JavaScript Function Chaining:

function hello() {
  if (!(this instanceof hello))
        return new hello();
  var _hello = "Hello ";
  this.world = function(message) {
    alert(_hello + message);
  }

}
hello().world("World!");

Answer №3

Unsynchronized JavaScript and XML operates in an unsynchronized manner.

The function provided to post executes once the HTTP response arrives rather than immediately.

You must process the data within that callback function. Exiting from it is impossible since it is too delayed.

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