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Thread: Regular expression to enforce 2 digits after decimal point

  1. #1
    Join Date
    Jan 2013
    Posts
    3

    Regular expression to enforce 2 digits after decimal point

    <html>
    <script>
    function doCheck(txtidval)
    {
    var i,exceptions=[8,46,37,39,13,9]; // backspace, delete, arrowleft & right, enter, tab
    var isException=false;
    var isDot=(190==event.keyCode); // dot
    //Value which is typed
    var k=String.fromCharCode(event.keyCode);

    for (i=0;i<exceptions.length;i++)
    {
    if(exceptions[i]==event.keyCode)
    isException=true;
    }

    if(isNaN(k) && (!isException) && (!isDot))
    {
    event.returnValue=false;
    }
    else
    {
    var p=new String(document.getElementById(txtidval).value+k).indexOf(".");


    if((p<document.getElementById(txtidval).value.length-2 || isDot) && p>-1 && (!isException))
    {
    event.returnValue=false;
    }
    else if(document.getElementById(txtidval).value.length>=3 && (!isException) && p==-1)
    {
    //dot checking
    if(event.keyCode != "190")
    {
    alert(document.getElementById(txtidval).value);
    event.returnValue=false;
    }
    }
    else if(document.getElementById(txtidval).value>=3)
    {
    alert(document.getElementById(txtidval).value);
    }
    }
    }
    </script>
    <body>
    <input type="textbox" id="txtid" onkeydown="doCheck('txtid')"/>
    </body>
    </html>

    i dont need output like .21 and also after entering 575 when moving curson in front of 575 it allows dot(".") so please kindly correct it

  2. #2
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    373
    /(\d*\.\d\d)\D*/ Should do it. You can take result[1] to parseFloat to read it.

  3. #3
    Join Date
    Jan 2013
    Posts
    3
    Hi Wbport Thanks for answering ..where we use that in my code ?

  4. #4
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    373
    Code:
    result = valueFromATextArea.match(/(\d*\.\d\d)\D*)
    if (result == null)
      alert("Insert appropriate squawk here");
    else
      var theNumberIWantToLookAt = parseFloat(result[1]);
    Last edited by wbport; 01-09-2013 at 06:37 AM. Reason: Add CODE tags to format

  5. #5
    Join Date
    Jan 2013
    Posts
    3
    Thanks wbport

  6. #6
    Join Date
    Dec 2005
    Location
    FL
    Posts
    7,350

    Lightbulb

    An alternative solution...
    Code:
    <!DOCTYPE HTML>
    <html>
    <head>
    <title> Untitled </title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    </head>
    <body>
    <input type="text" onkeyup="return processNumber(this)" value="">
    <script type="text/javascript">
    function processNumber(info) {
      var v = info.value;
      var n = v.split('.');
      if (n[1] != undefined) { v = n[0]+'.'+n[1].substring(0,2); }
      info.value = v;
      return true;
    }
    </script>
    
    </body>
    </html>

  7. #7
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    373
    My first line should have read: result = valueFromATextArea.match(/(\d*\.\d\d)\D*/)

    The last slash was needed to terminate the regular expression.

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