CODEWITHSUNDEEP
jqueryajaxreturn
sadmicrowave
sadmicrowave

Reputation: 40892

jQuery return ajax success function results

I need to return true or false to my alert() from the results of an ajax success function. However, I'm having problems since the alert() result is always 'undefined'...any ideas on how to fix this?

I have DoAjax as it's own function because I call it multiple times within the .js file.

var val = '12345';  
alert( DoSerialVerification( val ) ); //this returns 'undefined' regardless of cType.length

function DoSerialVerification( piVal ){
    var fSuccess = function( oData ){
        var cType = oData.type
        if( cType.length > 0 ){
           alert( cType );                  //with piVal = 12345 cType will return 'MODULE'
           $('#dialog-1').attr('type', cType);
           return true;
        } else {
           return false;
        }
    };
    DoAjax({ Action: "DoSerialVerification", Value: piVal }, fSuccess );
}

function DoAjax( pAjaxParams, pSuccess ){
    $.ajax({url        : 'procedures?',
            data       : pAjaxParams,
            async      : false,
            type       : "POST",
            dataType   : "json",
            error      : function(oD,oT,oE){ alert( oD+'\n'+oT+'\n'+oE ) },
            success    : pSuccess
    });
}

Upvotes: 0

Views: 1527

Answers (2)

ivan
ivan

Reputation: 628

you need to return something from the DoSerialVerification function... modified DoSerialVerification function:

function DoSerialVerification( piVal ){
    // here
    var result = false;

    var fSuccess = function( oData ){
        var cType = oData.type
        if( cType.length > 0 ){
           alert( cType );                  //with piVal = 12345 cType will return 'MODULE'
           $('#dialog-1').attr('type', cType);

           //here
           result = true;
        }
    };
    DoAjax({ Action: "DoSerialVerification", Value: piVal }, fSuccess );

    //here
    return result;
}

Upvotes: 1

Elliot Nelson
Elliot Nelson

Reputation: 11557

What you're trying to do isn't possible: calling AJAX is an asynchronous process, your function DoAjax will return before the response is ever received from the server. That is why you are providing callbacks: once the server returns a response, it'll enter either your error callback or your success callback, depending on the result.

Change this:

alert( DoSerialVerification( val ) );

To this:

DoSerialVerification(val);

And then move your alert call into your "fSuccess" function.

Upvotes: 0

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