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if..else condition in jquery for making ajax calls

Hello experts,

I am trying to call the ajax function only if there are values in 'stepname' and 'altmethod' else show and alert. When I include the following code, the else part gets executed all the time though there are no values. Could anyone kindly help me with this.

$(document).on("click", '#nextstep', function(e) {

    e.preventDefault();
 var stepname = $('#stepname').val(); 
 var chosen_altmethod = $('#chosen_altmethod').val();
 var altmethod = $('#altmethodname').val();

 
var formData = new FormData();
formData.append('stepname',stepname);
formData.append('altmethod',altmethod);
formData.append('chosen_altmethod',chosen_altmethod);
 formData.append('action','nextstep');

 console.log(stepname,"stepname");
console.log(altmethod, "altmethod");
console.log(chosen_altmethod,"chosen_altmethod");

if((stepname=="undefined") && (altmethodname=="undefined")){
  alert('please choose a step');
}else{
        $.ajax({
             type: 'POST',
            url: "<?= base_url() ?>index.php/variants/fetchstep1/",
             data: formData,
             processData: false,
      contentType: false,
             success: function (data) {

   $("#steplist").remove();
 $("#replacelist").html(data);
   $('html, body').animate({ scrollTop: 0 }, 0);
             }
         });
}
     });

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Thank you in advance

ASKER CERTIFIED SOLUTION

zephyr_hex (Megan)

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nish darsh

ASKER

Perfect.. Thank you very much for the quick reply.. :)

Julian Hansen

To follow on from zephyr_hex's comments (not for points) there is a significant difference between the state of a variable being undefined and the string undefined.

When you put undefined in quotes you turn it into a string - the JS compiler has no way of knowing that you meant undefined - it has to interpret that as a string.

nish darsh

ASKER

Real quick and helpful reply