Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

how to check if a tag exists using javascript without getting an error

I have xml data with root "clients" and it can contains multiple elements of "client" inside it. sometimes there are no client elements that are returned in the XML file (this is ok). I need to determine if there are any client elements returned so i tried using:

if(typeof myfile.getElementsByTagName("client")){
  alert("no clients");
}

This does the intended job, but I get a firebug error whenever there are no "client" elements.

like image 667
VoltzRoad Avatar asked Dec 24 '12 06:12

VoltzRoad


1 Answers

Why not just check for the length of the NodeList?

if( myfile.getElementsByTagName("client").length == 0 )
{
 alert("no clients");
}

Add this to check if myfile has been defined

if( typeof myfile == "undefined" || myfile.getElementsByTagName("client").length == 0 )
{
 alert("no clients");
}
like image 187
Travis J Avatar answered Oct 21 '22 04:10

Travis J