Passing a string from variable as a key in javascript object literal

Question

How can i do this?

objPrefix = btn.attr('data-objprefix'); //<button data-objPrefix="foo">
var sendData =  {objPrefix : {"bar":"ccccc"}};

ANd I want the output to be

{"foo" : {"bar":"ccccc"}};

but instead it is

{"objPrefix" : {"bar":"ccccc"}}

Answer 1

When you use the literal notation objPrefix is considered as the keyname itself and not value of the variable objPrefix , Instead try use bracket notation to set the property name for the object based on a variable value. So try this way:

var sendData = {};
sendData[objPrefix] = {"bar":"ccccc"};

Also you can infact use jquery data-api to fetch the value of data-attribute ie

objPrefix  = btn.data('objprefix')