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POHow can I keep this "onclick" from happening more than once?
 

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  1. POHow can I keep this "onclick" from happening more than once?
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    <p>I am trying to have a button, that when clicked, opens up an area to type a message. I am using "onclick" in the HTML and I want it to be only clickable once. I don't want it to keep making more textarea's the more you click it.</p> <p>I have a <em>this.onclick="null"</em> after the <em>onclick</em> that calls the function. This was working up until I added the submit button.</p> <p>So this code works:</p> <p>HTML:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script type="text/javascript" src="js/question.js"&gt;&lt;/script&gt; &lt;style type="text/css"&gt; #container { position: absolute; height: 443px; width: 743px; border: 1px solid black; border-radius: 0 0 20px 0; margin-top: 75px; } &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="container"&gt;&lt;/div&gt; &lt;button id="new_message" onclick="createMessage(), this.onclick=null;"&gt;New Message&lt;/button&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Javascript:</p> <pre><code>function createMessage() { var form = document.createElement("form"); form.name = "form_input"; form.method = "POST"; form.action = "messages.php"; container.appendChild(form); var textarea = document.createElement("textarea"); textarea.name = "message_input"; textarea.cols = 84; textarea.rows = 16; textarea.id = "message_input"; container.appendChild(textarea); }; </code></pre> <p>But when I leave the HTML the same and add the submit button to the javascript like this:</p> <pre><code>function createMessage() { var form = document.createElement("form"); form.name = "form_input"; form.method = "POST"; form.action = "messages.php"; container.appendChild(form); var textarea = document.createElement("textarea"); textarea.name = "message_input"; textarea.cols = 84; textarea.rows = 16; textarea.id = "message_input"; container.appendChild(textarea); var submit = document.createElement("button"); submit.innerHTML = 'Send'; submit.id = 'send_message'; container.appendChild(submit); submit.onClick(messageAjax()); }; </code></pre> <p>It starts to duplicate again. Is there any way to keep this from happining?</p> <p>Thanks for your help! </p>
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    1. CODo you verify that the onclick() event has not already been set once before you add it again?
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      1. POHow can I keep this "onclick" from happening more than once?
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    2. COWhy not just check to see if the textarea already exists before adding it? They you would never get multiple ones.
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      1. POHow can I keep this "onclick" from happening more than once?
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