JavaScript: Getting an objects property value

Question

I am wandering if this is possible below:

var layers = {};
layers.group3 = new L.MarkerClusterGroup(); //some group of objects 
layers.group3.name = "somestr"; //here i want to give a property name to group3 object. 


function checkLayers(data, t) {

    for (var name in layers) {
         var value = layers[name];
         alert("name: "+name+ " value: "+value);

         if(layers.group3.name == t){
             //do something
         }
    }     
}

How can i access the name property for group3. It does not show up in the alert. And I also want to compare the value to parametar "t".

for (var name in layers) only loops over the properties of layers. Your name property is a property of the group3 object, not a property of layers. — nnnnnn
– nnnnnn, Commented Jan 23, 2014 at 11:00

Kevin Bowersox · Accepted Answer · 2014-01-23 11:17:10Z

1

If you want to get the name property through iteration, you must check if the property name for the iteration is group3. Once you are sure you have the group3 property you can access the name property. The for...in loop will iterate over every property of an object, when using in layers it iterates over all of layers properties, since group3 is a property on layers you cannot access the group3.name property by simply iterating over the properties in layers.

for (var name in layers) {
     if(name == "group3" && layers[name].name = t){
         delete layers[name];
     }
}

This can be done much simpler without iteration:

alert(layers.group3.name);

edited Jan 23, 2014 at 11:17

answered Jan 23, 2014 at 11:01

Kevin Bowersox

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1 Comment

user2906420 Over a year ago

Thanks for your reply, okay I find the name property of group3 but then once it matches parametar "t" I want to totally remove that object - "group3" - can i achieve this ??

Verych · Accepted Answer · 2014-01-23 11:07:31Z

I modified your code. It works fine:

var layers = {};
layers.group3 = {};
layers.group3.name = "somestr"; //here i want to give a property name to group3 object. 


function checkLayers(data, t) {

    for (var name in layers) {
         var value = layers[name];
         console.log("name: ", name , " value: " , value);

         if(layers.group3.name == t){
             console.log(layers.group3.name);
         }
    }     
}
checkLayers('', 'somestr');

Results in console:

name:  group3  value:  Object {name: "somestr"} 
somestr

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