How to check if datalist is empty in javascript

Question

var dl=document.getElementById("rptImages");                                     
var rowArray = dl.getElementsByTagName('tr');                   
if ( rowArray.length <= 0 )
{
  alert('No data in DataList');                        
}

but in this code I didn't get alert when no data in Datalist, I am getting error message 'getElementsByTagName' is undefined or null reference.

`if ( rowArray.length === 0 )` – synthet1c Nov 29 '16 at 12:25 — synthet1c, Nov 29 '16 at 12:25
@synthet1c `rowArray.length <= 0` do the same – Mahi Nov 29 '16 at 12:26 — Mahi, Nov 29 '16 at 12:26

score 2 · Answer 1 · answered Nov 29 '16 at 12:29

2

Looks like your first line doesn't find the element:

var dl = document.getElementById("rptImages");

as the error effectively complains that dl is null.

answered Nov 29 '16 at 12:29

Mark Williams

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How to check if datalist is empty in javascript

1 Answers1