Check if an array is empty

Question

I've tried several things which are listed on the forum here, but I can't get this one to work.

So my question: How to check if an array is empty and if so hide an element?

Perhaps I'm doing something completly wrong?

My code:

 var listaSelection = {
 "category": [{ value: "1234", text: "Test" }]};
 $("select#list").change(function(){
 $("#cat3").html($("#list option:selected").text());
 var options = '';
 listsa = listaSelection[$(this).val()];
 $('select#listA').empty();
 options += '<option value="">Choose</option>';
 $.each(listsa, function() {
 options += '<option value="' + this.value + '">' + this.text + '</option>';
 });
 if(listsa.length > 0){ 
 $('select#listA').append(options);
 $('.zoeken-select.listA').fadeIn(300);
 }else{
 //this array is empty
 return false;
 }
 }); 

The HTML

<div class="zoeken-select course">
 <div class="zoeken-value" id="cat2">Selecteer je sector/locatie</div>
 <div class="zoeken-handle"></div>
 <select id="course" class="gui-validate">
 </select>
 </div>
 <div class="zoeken-select list">
 <div class="zoeken-value" id="cat3"></div>
 <div class="zoeken-handle"></div>
 <select id="list" class="gui-validate">
 </select>
 </div>
 <div class="zoeken-select listA">
 <div class="zoeken-value" id="cat4"></div>
 <div class="zoeken-handle"></div>
 <select id="listA" class="gui-validate">
 </select>
 </div>

• Brad Christie: I assume $(this).val() contains category in this example (surrendering [{value: "1234", text: "Test" }])?

Answer 1

Use the isEmptyObject method

jQuery.isEmptyObject({}); // true
jQuery.isEmptyObject({ foo: "bar" }); // false

Answer 2

use

jQuery.isEmptyObject({});

see EmptyObject

Answer 3

for array

 var arrayname= [1,2,3,4,5];

now come in else case

if (arrayname.length === 0) {
 // do your stuff 
}else{
// doyour stuff
 }

now come in if case

 var arrayname= [];
if (arrayname.length === 0) {
 // do your stuff 
}else{
// doyour stuff
 }

for object

jQuery.isEmptyObject({}); // true
jQuery.isEmptyObject({ test: "testvalue" }); // false

reference $.isEmptyObject and array length

• Meules: Ok thx, never heard of this. I've read the references but how do I incorporate this in the code above?
• Rituraj ratan: first $('.zoeken-select.listA').fadeIn(300); chnage this to $('.zoeken-select .listA').fadeIn(300)