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    <p>Totaly, Here is what i mean : I have one form as below:</p> <pre><code>&lt;div class="form"&gt; &lt;form method="post" action="index.php" id="app_1065" name="app_1065"&gt; &lt;input type="text" value="samefield" /&gt; &lt;input type="text" value="samefield" /&gt; &lt;input type="text" value="samefield" /&gt; &lt;input type="text" value="samefield" /&gt; &lt;!-- Key will be render when runtime and loading page --&gt; &lt;input type="hidden" name="key" value="dloadform" /&gt; &lt;input type="button" id="btn_dload" value="Download"&gt; &lt;input type="button" id="btn_try" value="Try Now"&gt; &lt;/form&gt; &lt;/div&gt; &lt;script&gt; $("#btn_dload").click(function(){ var formDownload = $(".form").find("form:first"); document.getElementById('mktForm_1065').submit(); return false; }); $("btn_try").click(function(){ var formTryNow = $(".form").find("form:first"); $(formTryNow).attr("id", "app_1160"); $(formTryNow).attr("name", "app_1160"); $(formTryNow).find("input[name='mkt_key']").val("tryform"); document.getElementById('app_1160').submit(); return false; }); &lt;/script&gt; </code></pre> <ul> <li>Explain: If user click the download form, it will submit with form id/name is app_1065, and key="download" by default. If user click the button try now, it will update the form with new id,name and key of try now form before submit form. </li> </ul> <p>Issue: - Now the download form works normally by default. But i don't why the try now form doesn't work after update the new id, name and key.</p>
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