JavaScript Object using . to retrieve values

Question

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How to access object using dynamic key?

I have multiple select with different options, the later options depend on the earlier choices. So I would like to generate options for later select, I am in the middle of doing this, and I have encountered some problems:

function generateOptions(selected) 
  { 
  var jsonObj = ('food':['a','b','c'])
  //able to get selected_value as food  
  var selected_value = selected.options[selected.selectedIndex].value 
  var options = jsonObj.selected_value  
  }

if I do jsonObj.food, then I can get output in console ['a','b','c']. But if I try to use selected_value, then I get undefined

So the . for retrieving data from an Object only works for absolute values not a var? Anybody can help?

`var jsonObj = ('food':['a','b','c'])` doesn't look like valid JavaScript btw. — Felix Kling, Mar 14 '12 at 20:00

score 4 · Accepted Answer · answered Mar 14 '12 at 19:50

4

Use bracket notation for dynamic property names:

var options = jsonObj[selected_value];

answered Mar 14 '12 at 19:50

jbabey

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JavaScript Object using . to retrieve values

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