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    <p>Can anyone please tell why my function B() is not giving giving response?</p> <pre><code>&lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;script src="http://code.jquery.com/jquery-latest.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; var sessionID=null ; function A() { $.getJSON('http://url.php?id=login&amp;email='+document.getElementById("txtemail").value+'&amp;password='+document.getElementById("txtpassword").value, function (data) {sessionID = data.session_id; alert(data.status); alert(data.msg); alert(data.user_id); alert(sessionID); }); } function B() { $.getJSON('http://url.php?id=chat_init&amp;sess_d='+sessionID+'&amp;user_id='+document.getElementById("user_id").value+ '&amp;to_id='+document.getElementById("to_id").value, function (data) { alert(data.status); alert(data.msg);alert(data.room_id); }); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; Username : &lt;input type="text" id="txtemail" /&gt; &lt;br/&gt;&lt;br/&gt; Password : &lt;input type="password" id="txtpassword"/&gt;&lt;br/&gt; &lt;input type="button" value="Login" onclick="A()" /&gt;&lt;br /&gt; My id is : &lt;input type="text" id="user_id" /&gt; &lt;br /&gt;&lt;br /&gt; To ID is : &lt;input type="text" id="to_id" /&gt;&lt;br /&gt;&lt;br /&gt; &lt;textarea rows="10" cols="25"&gt; &lt;/textarea&gt;&lt;br /&gt;&lt;br /&gt; &lt;textarea rows="2" cols="18"&gt; &lt;/textarea&gt; &lt;input type="button" value="Initialize chat" onClick="B()"&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This is my code</p>
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