CODEWITHSUNDEEP
jquery
KSL
KSL

Reputation: 49

Retrieving values from object with array

I am working on method code in which I have to iterate through an json object with dynamic array. my code is like this: 

var tableHeaders = ["id", "name", "status"];    
var item = {
    id: 1,
    name: "test name",
    status: true,
    email: "[email protected]"
}    
console.log(item.id);    // works well --> 1    
console.log(tableHeaders[0]); // works well --> id    
console.log(item.tableHeaders[0]);  // not works

Here is jsfiddle: http://jsfiddle.net/kslagdive/rjFHV/ Please suggest me, how can I get value of item with Array element? Thanks

Upvotes: 1

Views: 71

Answers (4)

Stefan
Stefan

Reputation: 14893

Tabheaders is not a value of item. Try 

var tableHeaders = ["id", "name", "status"];    
var item = {
    id: 1,
    name: "test name",
    status: true,
    email: "[email protected]",
    tableHeaders: tableHeaders // define "tableHeaders" as value of "item"
}

Thanks @xec for your comment.

Well the answer is already here but anyway:

var key = tableHeaders[0];  // the key for the value you want to extract from items.
var value = item[key];      // get the value from item based on the key defined 
                            // in table headers using the [Bracket notation][1] 
                            // (@Frédéric Hamidi).

Upvotes: 0

Arun P Johny
Arun P Johny

Reputation: 388436

Need to use [] notation instead of . notation when you use dynamic keys

console.log(item[tableHeaders[0]]);

Demo: Fiddle

Upvotes: 1

raina77ow
raina77ow

Reputation: 106483

It should be...

item[ tableHeaders[0] ];

... that is, using bracket notation to access a property by its name. Note that you use any complex expression here, for example:

item[ 'e' + 'mail' ]; // the same as item.email

Upvotes: 1

Frédéric Hamidi
Frédéric Hamidi

Reputation: 263147

Since your property name is dynamic, you have to use bracket notation instead of dot notation:

console.log(item[tableHeaders[0]]);  // Works.

Upvotes: 2

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