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copied!<p>It doesn't "disable" the back arrow — your code keeps replacing all the text outright, whenever you press a key, and every time that happens the caret position is lost.</p> <p>Simply don't do that.</p> <p>Use a better mechanism for banning spaces, such as <a href="https://stackoverflow.com/a/11268278/560648">returning <code>false</code> from an onkeydown handler when the key pressed is <code>space</code></a>:</p> <pre><code>$(function() { $("input#Username").on("keydown", function (e) { return e.which !== 32; }); }); </code></pre> <p>This way, your textbox is prohibited from receiving the spaces in the first place and you don't need to replace any text. The caret will thus remain unaffected.</p> <hr> <h3>Update</h3> <p><a href="https://stackoverflow.com/a/14236954/560648"><em>@VisioN</em>'s adapted code</a> will also add this space-banning support to copy-paste operations, whilst still avoiding text-replacement-on-<code>keyup</code> handlers that affect your textbox value whilst your caret is still active within it.</p> <p>So here's the final code:</p> <pre><code>$(function() { // "Ban" spaces in username field $("input#Username").on({ // When a new character was typed in keydown: function(e) { // 32 - ASCII for Space; // `return false` cancels the keypress if (e.which === 32) return false; }, // When spaces managed to "sneak in" via copy/paste change: function() { // Regex-remove all spaces in the final value this.value = this.value.replace(/\s/g, ""); } // Notice: value replacement only in events // that already involve the textbox losing // losing focus, else caret position gets // mangled. }); }); </code></pre>

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