how to add javascript variable value in facebook feed text

I m trying to add javascript variable value to facebook feed text function as below

var question = document.getElementById("question").value;

var attachment = {
    'name':'xyz',
    'href':'xyz',
    'caption':'testing',
    'description':  question ,
    'media':[{'type':'image','src':开发者_运维问答'9090.gif','href':'xyz.php'}]
    };
Facebook.streamPublish('', attachment);

but it is not displaying value of variable in that. Please help me.....

In Facebook (FBJS), you should use getValue() instead:

var question = document.getElementById("question").getValue();