CODEWITHSUNDEEP
jquery
Ricardo Binns
Ricardo Binns

Reputation: 3246

return function value from $.post callback

js:

 function verificaExistPed(numped){
        var valida;
        jQuery.post("procedures/class_oc.php", // ajax post
            {
                cache      : false,
                checkYear  : true,
                numped     : numped
            },
            function(data)
            {
                if(data === "s"){
                    valida = true;
                }else{
                    valida = false;
                }
            }
        )
        return valida;
  }

and, calling the function in another place, should return valida result inside variable check, in my case, true or false.

var check = verificaExistPed('".$numped."');
alert(check); // always undifined

but, always undefined.

how can i set valida to true or false from a $.post callback ?

Upvotes: 0

Views: 1242

Answers (2)

Abdul Munim
Abdul Munim

Reputation: 19217

You cannot return from as jQuery.post is an asynchronous call. You have to rely on a callback function in order to get the response from server. Try this:

 function verificaExistPed(numped, isValidCallback){
        jQuery.post("procedures/class_oc.php", // ajax post
            {
                cache      : false,
                checkYear  : true,
                numped     : numped
            },
            function(data)
            {
                isValidCallback(data === "s");
            }
        )
  }

USAGE:

verificaExistPed('".$numped."', function(isValid) {
   alert(isValid); //returns true or false
});

Upvotes: 1

Samich
Samich

Reputation: 30095

It's because handler are invoked asinchronously after your functon invoked. So you synchronously request for it, like:

function test() {
    var html = $.ajax({
    url: "procedures/class_oc.php",
       async: false // <-- heres the key !
    }).responseText;

    return html;
}

Upvotes: 2

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