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    <p>Based on clarification in comment, try this:</p> <p><strong>Try it out:</strong> <a href="http://jsfiddle.net/fsPgJ/2/" rel="nofollow noreferrer">http://jsfiddle.net/fsPgJ/2/</a></p> <p><strong>EDIT:</strong> Added a <code>keypress</code> event to deal with the user holding down a key.</p> <pre><code>$('input').blur(function() { var val = this.value.toLowerCase(); if(val != "yes" &amp;&amp; val != "no") { this.value = ''; alert( "'Yes' or 'No' is required. \n Please try again."); } }) .keypress(function() { var val = this.value.toLowerCase(); if(val != "yes" &amp;&amp; val != "no") this.value = ''; }) .keyup(function() { var val = this.value.toLowerCase(); if("yes".indexOf(val) != 0 &amp;&amp; "no".indexOf(val) != 0) { this.value = this.value.substr(0,this.value.length - 1); } }); </code></pre> <hr> <p><strong>Original:</strong></p> <p>If there's some reason you're not using a <code>&lt;select&gt;</code> or <code>:radio</code> or something, then you could have jQuery check the value on a <code>.blur()</code> event.</p> <p><strong>Try it out:</strong> <a href="http://jsfiddle.net/fsPgJ/" rel="nofollow noreferrer">http://jsfiddle.net/fsPgJ/</a></p> <pre><code>$('input').blur(function() { var val = this.value.toLowerCase(); if(val != "yes" &amp;&amp; val != "no") { this.value = ''; alert( "'Yes' or 'No' is required. \n Please try again."); } }); </code></pre> <p>This just clears the input if the (case insensitive) value is not "yes" or "no". I also added an <code>alert()</code> to give the user a little feedback as to why the field was cleared. You may want a different feedback approach.</p>
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    1. POLimit Input text box with Jquery
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    1. COI'm actually looking for something a bit more sophisticated. Ideally I want to actively block the input dynamically. This is, if the user press the letter X, then it shouldn't be even displayed, as the only valid enters start with Y or N
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    2. CO@webyacusa - I'll update in a minute.
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    3. CO@webyacusa - Just updated my answer. I left the `.blur()` event in there because a `keyup()` won't help if the user uses the GUI to paste text into the input.
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