blocks|key|1230793|text|<input+name="lorem"+onkeyup="this.value=this.value.replace(/[%5Ea-z]/g,'');">|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1230794|对于喜欢粘贴而不是打字的邪恶用户，可以与onblur相同;)|unstyled|offset|length|style|CODE|1230795|%2B漂亮的jQuery代码：|1230796|<input+name="lorem"+class="alphaonly">
<script+type="text/javascript">
$('.alphaonly').bind('keyup+blur',function(){+
++++var+node+=+$(this);
++++node.val(node.val().replace(/[%5Ea-z]/g,'')+);+}
);
</script>|1230797|entityMap^0|0|K|6|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$B|C]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>&lt;input name="lorem" onkeyup="this.value=this.value.replace(/[^a-z]/g,'');"&gt;
</code></pre>

<p>And can be the same to <code>onblur</code> for evil user who like to paste instead of typing ;)</p>

<p>[+] Pretty jQuery code:</p>

<pre><code>&lt;input name="lorem" class="alphaonly"&gt;
&lt;script type="text/javascript"&gt;
$('.alphaonly').bind('keyup blur',function(){ 
    var node = $(this);
    node.val(node.val().replace(/[^a-z]/g,'') ); }
);
&lt;/script&gt;
</code></pre>


blocks|key|1230832|text|如果键代码不在'a'..'z‘范围内，则只允许使用小写字母，请在事件对象上调用preventDefault。如果应允许大写，请在65..90或'A'..'Z‘之间检查。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1230833|或者，使用市面上众多input+mask+plugins中的一种。|1230834|参见example。|1230835|​$(<selector>).keypress(function(e)+{
++++if(e.which+<+97+/*+a+*/+%7C%7C+e.which+>+122+/*+z+*/)+{
++++++++e.preventDefault();
++++}
});​​​​​|code-block|syntax|javascript|1230836|entityMap|0|LINK|mutability|MUTABLE|url|http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=jquery%2Bmask%2Bplugin|1|http://jsfiddle.net/m7QrG/^0|13|E|0|A|I|0|0|2|7|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|J|3|K|5|L|7|19|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

<p>To allow only lower case alphabets, call <code>preventDefault</code> on the event object if the key code is not in the range 'a'..'z'. Check between 65..90 or 'A'..'Z' too if upper case should be allowed.</p>

<p>Or, alternatively use one of the many <a href="http://www.google.com/search?sourceid=chrome&amp;ie=UTF-8&amp;q=jquery+mask+plugin" rel="noreferrer">input mask plugins</a> out there.</p>

<p>See <a href="http://jsfiddle.net/m7QrG/" rel="noreferrer">example</a>.</p>

<pre><code>​$(&lt;selector&gt;).keypress(function(e) {
    if(e.which &lt; 97 /* a */ || e.which &gt; 122 /* z */) {
        e.preventDefault();
    }
});​​​​​
</code></pre>


blocks|key|1016132|text|感谢第一个答案..做了这个..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1016133|<input+name="lorem"+class="alpha-only">

<script+type="text/javascript">
+++$(function()+
+++{
++++++++$('.alpha-only').bind('keyup+input',function()
++++++++{+++++++
++++++++++++if+(this.value.match(/[%5Ea-zA-Z+áéíóúÁÉÍÓÚüÜ]/g))+
++++++++++++{
++++++++++++++++this.value+=+this.value.replace(/[%5Ea-zA-Z+áéíóúÁÉÍÓÚüÜ]/g,+'');
++++++++++++}
++++++++});
++++});
</script>|code-block|syntax|javascript|1016134|这有一些改进，如带重音的字母，将“输入”更改为“模糊”可以纠正暂时显示的非字母，也可以在用鼠标选择文本并纠正拖动时纠正。|1016135|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>Thanks to the first answer.. made this.. </p>

<pre><code>&lt;input name="lorem" class="alpha-only"&gt;

&lt;script type="text/javascript"&gt;
   $(function() 
   {
        $('.alpha-only').bind('keyup input',function()
        {       
            if (this.value.match(/[^a-zA-Z áéíóúÁÉÍÓÚüÜ]/g)) 
            {
                this.value = this.value.replace(/[^a-zA-Z áéíóúÁÉÍÓÚüÜ]/g, '');
            }
        });
    });
&lt;/script&gt;
</code></pre>

<p>This has some improvements like letters with accents, and changing "blur" for "input" corrects the Non-letters displayed momentarily, also when you select text with the mouse and dragging is corrected..</p>


blocks|key|1016179|text|下面演示了使用Jquery只允许字母a-z：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1016180|​|1016181|++$(function()+{
++++$('#txtFirstName').keydown(function(e)+{
++++++if+(e.shiftKey+%7C%7C+e.ctrlKey+%7C%7C+e.altKey)+{
++++++++e.preventDefault();
++++++}+else+{
++++++++var+key+=+e.keyCode;
++++++++if+(!((key+==+8)+%7C%7C+(key+==+32)+%7C%7C+(key+==+46)+%7C%7C+(key+>=+35+&&+key+<=+40)+%7C%7C+(key+>=+65+&&+key+<=+90)))+{
++++++++++e.preventDefault();
++++++++}
++++++}
++++});
++});|code-block|syntax|javascript|1016182|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<input+id="txtFirstName"+value="">|1016183|1016184|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>Demonstrated below to allow only letters [a-z] using Jquery:</p>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>  $(function() {
    $('#txtFirstName').keydown(function(e) {
      if (e.shiftKey || e.ctrlKey || e.altKey) {
        e.preventDefault();
      } else {
        var key = e.keyCode;
        if (!((key == 8) || (key == 32) || (key == 46) || (key &gt;= 35 &amp;&amp; key &lt;= 40) || (key &gt;= 65 &amp;&amp; key &lt;= 90))) {
          e.preventDefault();
        }
      }
    });
  });</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;input id="txtFirstName" value=""&gt;</code></pre>
</div>
</div>
</p>


blocks|key|1016232|text|仅允许使用小写字母和大写字母的JQuery函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1016233|文本字段：|1016234|<input+id="a"+type="text"+/>|code-block|syntax|javascript|1016235|JQuery函数：|1016236|$('#a').keydown(function+(e)+{
++++if+(e.ctrlKey+%7C%7C+e.altKey)+{
+++++++++++e.preventDefault();
++++}+else+{
+++++++++++var+key+=+e.keyCode;
+++++++++++if+(!((key+==+8)+%7C%7C+(key+==+32)+%7C%7C+(key+==+46)+%7C%7C+(key+>=+35+&&+key+<=+40)+%7C%7C+(key+>=+65+&&+key+<=+90)))+{
++++++++++++++++e.preventDefault();
+++++++++++}
++++}
});|1016237|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<p>JQuery function to allow only small and Capital Letters:</p>

<p>Text Field:</p>

<pre><code>&lt;input id="a" type="text" /&gt;
</code></pre>

<p>JQuery Function:</p>

<pre><code>$('#a').keydown(function (e) {
    if (e.ctrlKey || e.altKey) {
           e.preventDefault();
    } else {
           var key = e.keyCode;
           if (!((key == 8) || (key == 32) || (key == 46) || (key &gt;= 35 &amp;&amp; key &lt;= 40) || (key &gt;= 65 &amp;&amp; key &lt;= 90))) {
                e.preventDefault();
           }
    }
});
</code></pre>


blocks|key|1016320|text|@dev-null-dweller所描述的解决方案是绝对有效的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1016321|但是，从jQuery+3.0开始，.bind()方法已被弃用。从jQuery+1.7开始，它就被用于将事件处理程序附加到文档的.on()方法所取代，因此不鼓励使用它。|1016322|在此处检查jQuery+3.0的不推荐使用的方法列表：http://api.jquery.com/category/deprecated/deprecated-3.0/|1016323|因此，解决方案是用.on()方法代替.bind()。|1016324|如果您需要绑定现有元素，则代码将为：|1016325|$('.alphaonly').on('keyup+blur',+function(){
++++var+node+=+$(this);
++++node.val(+node.val().replace(/[%5Ea-z]/g,'')+);+
});+|code-block|syntax|javascript|1016326|如果需要绑定到动态元素，代码将为：|1016327|$(document).on('keyup+blur',+'.alphaonly',+function(){
++++var+node+=+$(this);
++++node.val(node.val().replace(/[%5Ea-z]/g,'')+);
});|1016328|您需要将事件绑定到文档或从文档加载中已经存在的一些其他元素。|1016329|希望这对新版本的jQuery有所帮助。|1016330|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/category/deprecated/deprecated-3.0/^0|0|H|0|4|A|H|7|W|A|1R|5|0|R|1L|0|0|9|5|I|7|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1K|8|@]|D|@$9|1L|A|1M|1|1N]]|E|$]]|$1|J|3|K|5|6|7|1O|8|@$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1T|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1U|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1V|8|@]|D|@]|E|$]]|$1|U|3|V|5|P|7|1W|8|@]|D|@]|E|$Q|R]]|$1|W|3|X|5|6|7|1X|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|11|$12|$5|13|14|15|E|$16|17]]]]

<p>Solution described by <code>@dev-null-dweller</code> is working absolutely.</p>

<p>However, As of <code>jQuery 3.0</code>, <code>.bind()</code> method has been deprecated. It was superseded by the <code>.on()</code> method for attaching event handlers to a document since <code>jQuery 1.7</code>, so its use was already discouraged. </p>

<p>Check deprecated methods list for jQuery 3.0 here: <a href="http://api.jquery.com/category/deprecated/deprecated-3.0/" rel="nofollow noreferrer">http://api.jquery.com/category/deprecated/deprecated-3.0/</a></p>

<p>So the solution is to use <code>.on()</code> method instead <code>.bind()</code>.</p>

<p>If you need to bind existing elements then the code will be :</p>

<pre><code>$('.alphaonly').on('keyup blur', function(){
    var node = $(this);
    node.val( node.val().replace(/[^a-z]/g,'') ); 
}); 
</code></pre>

<p>If you need to bind to dynamic elements the code will be :</p>

<pre><code>$(document).on('keyup blur', '.alphaonly', function(){
    var node = $(this);
    node.val(node.val().replace(/[^a-z]/g,'') );
});
</code></pre>

<p>You need to bind the event to document or some other element that already exist from the document load.</p>

<p>Hope this is helpful for new version of jQuery.</p>


blocks|key|1016344|text|//+allow+only++Alphabets+A-Z+a-z+_+and+space
$('.alphaonly').bind('keyup+blur',function(){+
++++var+node+=+$(this);
++++node.val(node.val().replace(/[%5EA-Za-z_\s]/,'')+);+}+++//+(/[%5Ea-z]/g,''
);
//+allow+only++Number+0+to+9
$('.numberonly').bind('keyup+blur',function(){+
++++var+node+=+$(this);
++++node.val(node.val().replace(/[%5E0-9]/,'')+);+}+++//+(/[%5Ea-z]/g,''
);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1016345|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>// allow only  Alphabets A-Z a-z _ and space
$('.alphaonly').bind('keyup blur',function(){ 
    var node = $(this);
    node.val(node.val().replace(/[^A-Za-z_\s]/,'') ); }   // (/[^a-z]/g,''
);
// allow only  Number 0 to 9
$('.numberonly').bind('keyup blur',function(){ 
    var node = $(this);
    node.val(node.val().replace(/[^0-9]/,'') ); }   // (/[^a-z]/g,''
);
</code></pre>


blocks|key|1016360|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1016361|++$("#test").keypress(function(event){
++++++++var+inputValue+=+event.charCode;
++++++++//alert(inputValue);
++++++++if(!((inputValue+>+64+&&+inputValue+<+91)+%7C%7C+(inputValue+>+96+&&+inputValue+<+123)%7C%7C(inputValue==32)+%7C%7C+(inputValue==0))){
++++++++++++event.preventDefault();
++++++++}
++++});
++$("#test1").keypress(function(event){
++++++++var+inputValue+=+event.charCode;
++++++++//alert(inputValue);
++++++++if(!((inputValue+>+47+&&+inputValue+<+58)+%7C%7C(inputValue==32)+%7C%7C+(inputValue==0))){
++++++++++++event.preventDefault();
++++++++}
++++});

++$("#test3").keypress(function(event){
++++++++var+inputValue+=+event.charCode;
++++++++//alert(inputValue);
++++++++if(!((inputValue+>+64+&&+inputValue+<+91)+%7C%7C+(inputValue+>+96+&&+inputValue+<+123)%7C%7C(inputValue==32)%7C%7C(inputValue+>+47+&&+inputValue+<+58)+%7C%7C(inputValue==32)+%7C%7C+(inputValue==0))){
++++++++++++event.preventDefault();
++++++++}
++++});|code-block|syntax|javascript|1016362|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
For+letters:<input+type="text"+id="test">+++<br>
<br>
For+Numbers:+<input+type="text"+id="test1">
<br>
<br>
For+Alphanumeric:+<input+type="text"+id="test3">|1016363|1016364|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|M|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|I|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>  $("#test").keypress(function(event){
        var inputValue = event.charCode;
        //alert(inputValue);
        if(!((inputValue &gt; 64 &amp;&amp; inputValue &lt; 91) || (inputValue &gt; 96 &amp;&amp; inputValue &lt; 123)||(inputValue==32) || (inputValue==0))){
            event.preventDefault();
        }
    });
  $("#test1").keypress(function(event){
        var inputValue = event.charCode;
        //alert(inputValue);
        if(!((inputValue &gt; 47 &amp;&amp; inputValue &lt; 58) ||(inputValue==32) || (inputValue==0))){
            event.preventDefault();
        }
    });

  $("#test3").keypress(function(event){
        var inputValue = event.charCode;
        //alert(inputValue);
        if(!((inputValue &gt; 64 &amp;&amp; inputValue &lt; 91) || (inputValue &gt; 96 &amp;&amp; inputValue &lt; 123)||(inputValue==32)||(inputValue &gt; 47 &amp;&amp; inputValue &lt; 58) ||(inputValue==32) || (inputValue==0))){
            event.preventDefault();
        }
    });</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"&gt;&lt;/script&gt;
For letters:&lt;input type="text" id="test"&gt;   &lt;br&gt;
&lt;br&gt;
For Numbers: &lt;input type="text" id="test1"&gt;
&lt;br&gt;
&lt;br&gt;
For Alphanumeric: &lt;input type="text" id="test3"&gt;</code></pre>
</div>
</div>
</p>


blocks|key|1231114|text|支持退格键：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1231115|new+RegExp("%5E[a-zA-Z+\b]*$");|code-block|syntax|javascript|1231116|此选项不会检查移动电话。因此，您可以使用jQuery+Mask+Plugin并使用以下代码：|offset|length|1231117|jQuery('.alpha-field,+input[name=fname]').mask('Z',{translation:++{'Z':+{pattern:+/[a-zA-Z+]/,+recursive:+true}}});|1231118|entityMap|0|LINK|mutability|MUTABLE|url|https://igorescobar.github.io/jQuery-Mask-Plugin/^0|0|0|K|I|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<p>Supports backspace:</p>

<pre><code>new RegExp("^[a-zA-Z \b]*$");
</code></pre>

<p>This option will not check mobile. So you can use a <a href="https://igorescobar.github.io/jQuery-Mask-Plugin/" rel="nofollow noreferrer">jQuery Mask Plugin</a> and use following code:</p>

<pre><code>jQuery('.alpha-field, input[name=fname]').mask('Z',{translation:  {'Z': {pattern: /[a-zA-Z ]/, recursive: true}}});
</code></pre>


blocks|key|1016421|text|$("#txtName").keypress(function+(e)+{

++++var+key+=+e.keyCode;
++++if+((key+>=+48+&&+key+<=+57)+%7C%7C+(key+>=+33+&&+key+<=+47)+%7C%7C+(key+>=+58+&&+key+<=+64)+%7C%7C+(key+>=+91+&&+key+<=+96)+%7C%7C+(key+>=+123+&&+key+<=+127))+{
++++++++e.preventDefault();
++++}
++++var+text+=+$(this).val();
++++$(this).val(text.replace("++",+"+"));

});++|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1016422|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$("#txtName").keypress(function (e) {

    var key = e.keyCode;
    if ((key &gt;= 48 &amp;&amp; key &lt;= 57) || (key &gt;= 33 &amp;&amp; key &lt;= 47) || (key &gt;= 58 &amp;&amp; key &lt;= 64) || (key &gt;= 91 &amp;&amp; key &lt;= 96) || (key &gt;= 123 &amp;&amp; key &lt;= 127)) {
        e.preventDefault();
    }
    var text = $(this).val();
    $(this).val(text.replace("  ", " "));

});  
</code></pre>


blocks|key|1231180|text|if+(!isValidName(name))+{+++++++++++
+++//return+fail+message
}+else+{
+++//return+success+message
}

function+isValidName(name)+{
+++var+regex+=+new+RegExp("%5E[a-zA-Z+]%2B$");
+++if+(regex.test(name))+{
+++++return+true;++
+++}+else+{
+++++return+false;+
+++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1231181|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (!isValidName(name)) {           
   //return fail message
} else {
   //return success message
}

function isValidName(name) {
   var regex = new RegExp(&quot;^[a-zA-Z ]+$&quot;);
   if (regex.test(name)) {
     return true;  
   } else {
     return false; 
   }
}
</code></pre>


<p>I want to make a text box allow only letters (a-z) using jQuery.
Any examples?</p>


Allow text box only for letters using jQuery?

jQuery

我想让一个文本框只允许使用jQuery的字母(a-z)。有什么例子吗？

问是否允许文本框仅用于使用jQuery的字母？
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