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allowing only alphabets in text box using java script

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醉梦人生
醉梦人生 2020-12-02 01:28

I want to allow only alphabets in textbox using JavaScript I used the code: 

var nam=f.nm.value;
if(!isNaN(nam))  
    region.innerHTML=\"alphabets only\";
<
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6条回答
  • 梦如初夏
    2020-12-02 01:43 
    <html>
<head>
    <title>allwon only alphabets in textbox using JavaScript</title>
    <script language="Javascript" type="text/javascript">

        function onlyAlphabets(e, t) {
            try {
                if (window.event) {
                    var charCode = window.event.keyCode;
                }
                else if (e) {
                    var charCode = e.which;
                }
                else { return true; }
                if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123))
                    return true;
                else
                    return false;
            }
            catch (err) {
                alert(err.Description);
            }
        }

    </script>
</head>
<body>
    <table align="center">
        <tr>
            <td>
                <input type="text" onkeypress="return onlyAlphabets(event,this);" />
            </td>
        </tr>
    </table>
</body>
</html>
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  • 再見小時候
    2020-12-02 01:48

    :::::HTML:::::

    <input type="text" onkeypress="return lettersValidate(event)" />

    Only letters no spaces

    ::::JS::::::::

    // ===================== Allow - Only Letters ===============================================================

function lettersValidate(key) {
    var keycode = (key.which) ? key.which : key.keyCode;

    if ((keycode > 64 && keycode < 91) || (keycode > 96 && keycode < 123))  
    {     
           return true;    
    }
    else
    {
        return false;
    }
         
}
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  • 难免孤独
    2020-12-02 01:54

    just use onkeypress event like below:

    <input type="text" name="onlyalphabet" onkeypress="return (event.charCode > 64 && event.charCode < 91) || (event.charCode > 96 && event.charCode < 123)">
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  • 攒了一身酷
    2020-12-02 01:57

    You can try:

     function onlyAlphabets(e, t) {
        return (e.charCode > 64 && e.charCode < 91) || (e.charCode > 96 && e.charCode < 123) || e.charCode == 32;   
    }
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  • 北恋
    2020-12-02 01:58

    From kosare comments, i have create an demo http://jsbin.com/aTUMeMAV/2/

    HTML

          <form name="f" onsubmit="return onlyAlphabets()">
         <input type="text" name="nm">
         <div id="notification"></div>
         <input type="submit">
      </form>

    javascript

      function onlyAlphabets() {

  var regex = /^[a-zA-Z]*$/;
  if (regex.test(document.f.nm.value)) {

      //document.getElementById("notification").innerHTML = "Watching.. Everything is Alphabet now";
      return true;
  } else {
      document.getElementById("notification").innerHTML = "Alphabets Only";
      return false;
  }


}
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  • 天涯浪人
    2020-12-02 02:04

    You can use HTML5 pattern attribute to do this:

    <form>
    <input type='text' pattern='[A-Za-z\\s]*'/>
</form>

    If the user enters an input that conflicts with the pattern, it will show an error dialogue automatically.

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