.empty() jQuery method and undefined value

Question

HTML:

<div class="form-group">
    <div id="errorsum"></div>
</div>

JavaScript:

 var errornbr = 0;
 var mess;
 $("#addclient  input.form-control").each(function (index) {
     if ($(this).val() == "") {
         if ($(this).attr("data-val") != undefined) {
             if ($(this).attr("data-val-required") != undefined) {
                 errornbr = errornbr + 1;
                 mess = mess + "<br/>" + $(this).attr("data-val-required");
             }
         }
     }
 });
 $("#errorsum").empty();
 if (errornbr > 0) {
     $("#errorsum").append("<label class='col-xs-3 control-label text-danger' >" + mess + "</label>");
 }

First line of the label text is always undefined. the mess didn't contains such value.

So I need to know:

Does the empty() method is the reason of this?
How can I fix this issue?

@guradio thank you very much, plz post your comment as an answer — Lamloumi Afif
– Lamloumi Afif, Commented May 20, 2016 at 6:53
Why not append to current value? mess += "<br/>" + $(t....... — Kevin Lynch
– Kevin Lynch, Commented May 20, 2016 at 6:56

guradio · Accepted Answer · 2016-05-20 06:56:38Z

3

change var mess; to var mess = '';

Make the assume text value making it not return undefined

answered May 20, 2016 at 6:56

guradio

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Comments

user3886780 · Accepted Answer · 2016-05-20 07:02:34Z

0

Please use ( typeof VALUE != 'undefined' ) instead of ( VALUE != undefined )

Please write condition like this

if( typeof $(this).attr("data-val") != 'undefined' ){

 if( typeof $(this).attr("data-val-required") != 'undefined' ){

 }

}

answered May 20, 2016 at 7:02

user3886780

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