Accessing dynamic property names in Jquery/Javascript

Question

In a plugin I\'m writing, the dev can specify options, which I\'m storing and referencing like so:

(function( $, window) {
    $.widget(\"mobile.plug\", $.mo         


        

Answer 1

What you're looking for is bracketed notation with strings:

for (var i = 0; i<elems.length; i++){
   var el = elems.eq(i);
   console.log( o[el.jqmData("panel") + "Width"] );
   }

...assuming that el.jqmData("panel") returns "mid", "menu", etc.

In JavaScript, you can refer to a property with either dotted notation and a literal (obj.foo), or bracketed notation and a string (obj["foo"]). In the latter case, it doesn't have to be a literal string, it can be the result of an expression.

Answer 2

You're getting the error because you're trying to use both forms of the object member operator.

The two forms are...

• obj.propertyName dot notation

• obj["propertyName"] bracket notation

You have .[...] (using both. The dot expects a name to come after it)

You need [...] (no preceding dot)

Then also, you want to do string concatenation to add "Width"

o[el.jqmData("panel") + "Width"]

Answer 3

You should be able to concatenate "Width" to the "panel" result:

o[el.jqmData("panel") + "Width"]

E.g., if el.jqmData("panel") is "menu" you would get o["menuWidth"].