JQuery Mobile Page Not Refreshing - jquery-mobile

Question

I Did do my home work but i cannot get it to work.The Button Styles Are Not Refreshing Please Help.
<div id="qpage" data-role="page">
<div data-role="header">
<a id="exit-quiz" data-role="button" data-icon="arrow-l" >Exit</a>
<h1 id="ques-title">#ques-title</h1></div>
<div data-role="content">
<div class="ui-bar-a" id="ques-timer">
#ques-timer
</div>
<div id="question"><h3>#Question</h3></div>
<div class=".button-set" data-role="controlgroup" id="answerbox">
<a data-role="button" id="answer_1">#answer_1</a>
<a data-role="button" id="answer_2">#answer_2</a>
<a data-role="button" id="answer_3">#answer_3</a>
<a data-role="button" id="answer_4">#answer_4</a>
</div>
<div id="explanation">
</div>
</div>
<div data-role="footer"><h2>Copyright Kaveen</h2></div>
</div>
This is Th Javascript I wrote
$("#subject1").bind('click',function(){
var json = $.get("test.json",function(data){
$("#question").html(data.question);
$("#answer_1").html(data.mcq_1);
$("#answer_2").html(data.mcq_2);
$("#answer_3").html(data.mcq_3);
$("#answer_4").html(data.mcq_4);
});
i did try $( "div[data-role=page]" ).page( "destroy" ).page(); But it wont work Plese Help Me Thank you. JSFIDDLE http://jsfiddle.net/xRTCu/

Answer 1

Try this, it should work:
$("#answer_1").button("refresh");
If that is also not working, try this
$("#answer_1").buttonMarkup();
EDIT: jsfiddle updated http://jsfiddle.net/androdify/xRTCu/4/
Use this:
$("#answer_1 .ui-btn-text").text(data.mcq_1);
Why? Because jquery mobile adds a span around the button which has class="ui-btn-text"

Answer 2

Try $( "div[data-role=page]" ).trigger ("create") if you're using the latest version of jQuery mobile. page was deprecated some versions ago.
If you're using an older version of jQM, then you could use $("[data-role=button]").button().button ("refresh") after you're done appending your JSON data into those buttons.
EDIT
From your fiddle I can see that you're using html() and that's erasing jQM's markup. This is what data-role=button converts your markup:
<a data-role="button" id="answer_1">#answer_1</a>
//becomes
<a data-role="button" id="answer_1" data-corners="true" data-shadow="true" data-iconshadow="true" data-wrapperels="span" data-theme="c" class="ui-btn ui-shadow ui-btn-corner-all ui-first-child ui-btn-up-c">
<span class="ui-btn-inner">
<span class="ui-btn-text">mcq wrong</span>
</span>
</a>
So by using html() youre effectively erasing everything inside a. Try searching for ui-btn-text class inside a like this and then run html with your text in it:
$(".ui-btn-text", "#answer_1").html(data.mcq_1);
//OR
$("#answer_1").find(".ui-btn-text").html(data.mcq_1);
Here's your updated demo : http://jsfiddle.net/hungerpain/xRTCu/3/