Facing issue in using $.when().then() function

Question

I need to make sure that getValue() is called only after execution of SetValueForVariable(). I cannot modify BindValue() or SetValueForVariable().

I tried $.when(BindValue()).then(getValue());. (As i cannot change the already existing flow) It works some times but sometimes it shows the previously set value.

I need to call getValue on $(document).ready(). How do I make sure getValue() is only called after execution of SetValueForVariable().

//This function is inturn making call to SetValueForVariable() which is written in another file
//Cannot Change this
  function BindValue() {

    SetValueForVariable()

  }

  function getValue()
  {
    $.ajax({
    url: getRoutePath("GetPath/GetPath1"),
    type: "GET",
    async: true,
    success: function (data) {
    debugger;
        data = JSON.parse(data)
        $('#txtBox').text(data.Count);

        });
   }


//Written in another file  
//Cannot change this function
function SetValueForVariable() {


//this fucntion is making server call the server method sets value of a Session Variable
   $.ajax({
   url: getRoutePath("SetPath/SetPath1"),
   type: "GET",
   async: true,
           ....

     });
  }

This is not standard JavaScript. Please flag similar posts also as "jQuery" (fixed this one for you). — Cranio
– Cranio, Commented Aug 13, 2015 at 7:34
$.when need a parameter, a Deffered, and your functions return nothing. You have to return $.ajax — Hacketo
– Hacketo, Commented Aug 13, 2015 at 7:35
Unfortunately SetValueForVariable doesn't return the result of $.ajax (and BindValue doesn't return anything either) - so there's no possibility to use promises. What does setvalueforvariable do in it's success method? maybe you could kludge something together if it does something interesting there - but, I reckon you're SOOL — Jaromanda X
– Jaromanda X, Commented Aug 13, 2015 at 7:36

potatopeelings · Accepted Answer · 2015-08-13 07:42:41Z

3

You could redefine BindValue, calling the original BindValue in your new definition after ensuring that getValue has been called.

Pseudo code

 var originalBindValue = BindValue;

 BindValue = function() {
      if getValue has been called 
           originalBindValue();
      else 
           call getValue and then originalBindValue() in getValue success / failure callback
 }

I think this would work around your cannot modify BindValue limitation - you don't actually need access to BindValue code here.

answered Aug 13, 2015 at 7:42

potatopeelings

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1 Comment

dfsq Over a year ago

This is the best you can do in this case if BindValue cannot be modified directly.

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