The onkeydown event solves the need to directly submit data by pressing the Enter key_javascript skills

The login page needs to capture the user's need to press Enter to submit automatically:
Add an onkeydown event in the body to jump to the javascript before submitting the form.

Find the document as follows
The onkeydown event occurs when the user presses a keyboard key.
Syntax: onkeydown="SomeJavaScriptCode"

HTML tags that support this event;

Copy code The code is as follows:

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, , , , , , , , , , <dd>, <del>, <dfn>, <div>, <em>, <fieldset>, <form>, <h1> to <h6>, <hr>, <i>, <input>, <kbd>, <legend>, <li>, <map>, <object>, <ol>, <p>, </p> <pre class="brush:php;toolbar:false">, &lt;q&gt;, &lt;samp&gt;, &lt;small&gt;, &lt;span&gt;, &lt;strong&gt;, &lt;sub&gt;, &lt;sup&gt;, &lt;table&gt;, &lt;tbody&gt;, &lt;td&gt;, &lt;textarea&gt;, &lt;th&gt;, &lt;thead&gt;, &lt;tr&gt;, &lt;tt&gt;, &lt;ul&gt;, &lt;var&gt; &lt;br&gt; &lt;br&gt;Javascript that supports this event Object: &lt;br&gt;document, image, link, textarea Browser differences: &lt;br&gt;Internet Explorer uses event.keyCode to retrieve the pressed character, while Netscape/Firefox/Opera uses event.which. &lt;br&gt;Example: In this example, the user cannot type numbers in the input box&lt;br&gt;&lt;div class=&quot;codetitle&quot;&gt; &lt;span&gt;&lt;a style=&quot;CURSOR: pointer&quot; data=&quot;37383&quot; class=&quot;copybut&quot; id=&quot;copybut37383&quot; onclick=&quot;doCopy('code37383')&quot;&gt;&lt;u&gt;Copy code&lt;/u&gt;&lt;/a&gt;&lt;/span&gt; The code is as follows:&lt;/div&gt; &lt;div class=&quot;codebody&quot; id=&quot;code37383&quot;&gt; &lt;br&gt; &lt;br&gt; &lt;br&gt;&lt;script type=&quot;text/javascript&quot;&gt; &lt;BR&gt;function noNumbers(e) &lt;BR&gt;{ &lt;BR&gt;var keynum &lt;BR&gt;var keychar &lt;BR&gt;var numcheck &lt;BR&gt;if(window.event) // IE &lt;BR&gt;{ &lt;BR&gt;keynum = e.keyCode &lt;BR&gt;} &lt;BR&gt;else if(e.which) // Netscape /Firefox/Opera &lt;BR&gt;{ &lt;BR&gt;keynum = e.which &lt;BR&gt;} &lt;BR&gt;keychar = String.fromCharCode(keynum) &lt;BR&gt;numcheck = /d/ &lt;BR&gt;return !numcheck.test(keychar) &lt;BR&gt;} &lt;BR&gt;&lt;/script&gt; &lt;br&gt;&lt;form&gt; &lt;br&gt;&lt;input type=&quot;text&quot; onkeydown=&quot;return noNumbers(event)&quot;&gt; &lt;br&gt; &lt;/form&gt; &lt;br&gt; &lt;br&gt; &lt;/div&gt;&lt;/var&gt; &lt;/ul&gt;&lt;/tt&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;/th&gt;&lt;/textarea&gt; &lt;/td&gt; &lt;/tbody&gt; &lt;/table&gt;&lt;/sup&gt;&lt;/sub&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/small&gt;&lt;/samp&gt;&lt;/q&gt;</pre> </ol></object></map> </li> </legend></kbd></i> </h6> </h1> </form> </fieldset></em> </div></dfn></del> </dd>