CODEWITHSUNDEEP
jqueryfunction
frequent
frequent

Reputation: 28513

jquery - function returns "null" - how to check for this?

I have a function in Jquery Mobile called findclosestLink, that checks what is clicked when the user clicks on screen.

Looks like this:

var link = find(findClosestLink(event.target);

findClosestLink: function (ele) {
   var self = this;
   while (ele){
     if (ele.nodeName.toLowerCase() == "a"){
         break;
         }
      ele = ele.parentNode; 
      }
      console.log(ele);
      return ele;
   }

If I click somewhere in the screen ele consoles as "null" and my variable becomes "[]".

Question: how can I check for this empty something "[]"?

All of these don't work:

if ( link == 'null' ) { console.log("null"); }
if ( link == '' ) { console.log("empty");}
if ( link == 'undefined' ) { console.log("undefined"); }
if ( link == []) { console.log("empty object"); }
if ( link == $() ) { console.log("empty dings"); }

Thanks for help!

Upvotes: 1

Views: 1030

Answers (2)

Yoram de Langen
Yoram de Langen

Reputation: 5509

To explain my comment a bit more:

if ( typeof link == 'null' ) { console.log("null"); }
if ( link == '' ) { console.log("empty");}
if (  typeof link == 'undefined' ) { console.log("undefined"); }
if (  typeof link == 'object') { console.log("empty object"); }

or 

switch(typeof link) {
    case 'null':
        console.log('is null');
        break;
    [....]
}

Upvotes: 0

karim79
karim79

Reputation: 342695

Do you mean check for empty array? Use the length property:

console.log([].length); // 0

so:

// 0 is 'falsy', so...
if(!ele.length) {
    // empty
}

Upvotes: 1

Related Questions