CODEWITHSUNDEEP
javascriptjqueryajaxasp.net-mvc-4actionresult
perkes456
perkes456

Reputation: 1181

Returning undefined type of data on ajax call

I have a jquery script which does ajax call to my action inside the controller in my MVC application: 

$('#save').click(function () {
    $.post(url, { id: id, text: textarea.val() }, function (data) {
        if (data) {
            row.children('td').eq(3).text(textarea.val());
            row.children('td').eq(4).text('Da');
            row.children('td').eq(5).hide();
            $('#napomena').val('');
            form.hide();
        }
    });
});

And this is my controller: 

  public ActionResult PravdanjeIzostanaka(string id, string text)
        {
            var obj = db.Odsutnost.Find(Convert.ToInt32(id));
            if(obj!=null && text.Trim()!="")
            {
                obj.Napomena = text;
                obj.Opravdano = true;
                db.SaveChanges();
                return RedirectToAction("PregledIzostanaka");
            }
            return null;  // what am I supposed to return here so that data type in ajax would be undefined??          
        }

As you can see im checking whether the obj object and text field are !=null and if its empty. If those two requirements are not met I would like to make a little alert which would basically say: "Text field is required!" and modify my script to something like this:

 if (data!=="undefined") {
            row.children('td').eq(3).text(textarea.val());
            row.children('td').eq(4).text('Da');
            row.children('td').eq(5).hide();
            $('#napomena').val('');
            form.hide();
        }
else{
alert('Text field is required!');
}

So I need to modify my script and Action(action should return something which ajax would see it as undefined in order that I can do alert)...

Can someone help me out with this? :)

Upvotes: 2

Views: 960

Answers (1)

Rustin Cohle
Rustin Cohle

Reputation: 171

Just return a json string as undefined. More like the below:

public ActionResult PravdanjeIzostanaka(string id, string text)
        {
            var obj = db.Odsutnost.Find(Convert.ToInt32(id));
            if(obj!=null && text.Trim()!="")
            {
                obj.Napomena = text;
                obj.Opravdano = true;
                db.SaveChanges();
                return RedirectToAction("PregledIzostanaka");
            }
            return json("undefined");           
        }

Upvotes: 1

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