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Am using this javascript for restrict users to type only numbers and only one dot as decimal separator.

<script type="text/javascript">
 function fun_AllowOnlyAmountAndDot(txt)
        {
            if(event.keyCode > 47 && event.keyCode < 58 || event.keyCode == 46)
            {
               var txtbx=document.getElementById(txt);
               var amount = document.getElementById(txt).value;
               var present=0;
               var count=0;

               if(amount.indexOf(".",present)||amount.indexOf(".",present+1));
               {
              // alert('0');
               }

              /*if(amount.length==2)
              {
                if(event.keyCode != 46)
                return false;
              }*/
               do
               {
               present=amount.indexOf(".",present);
               if(present!=-1)
                {
                 count++;
                 present++;
                 }
               }
               while(present!=-1);
               if(present==-1 && amount.length==0 && event.keyCode == 46)
               {
                    event.keyCode=0;
                    //alert("Wrong position of decimal point not  allowed !!");
                    return false;
               }

               if(count>=1 && event.keyCode == 46)
               {

                    event.keyCode=0;
                    //alert("Only one decimal point is allowed !!");
                    return false;
               }
               if(count==1)
               {
                var lastdigits=amount.substring(amount.indexOf(".")+1,amount.length);
                if(lastdigits.length>=2)
                            {
                              //alert("Two decimal places only allowed");
                              event.keyCode=0;
                              return false;
                              }
               }
                    return true;
            }
            else
            {
                    event.keyCode=0;
                    //alert("Only Numbers with dot allowed !!");
                    return false;
            }

        }

    </script>

<td align="right">
<asp:TextBox ID="txtQ1gTarget" runat="server" Width="30px" CssClass="txtbx" MaxLength="6" onkeypress="return fun_AllowOnlyAmountAndDot(this);"></asp:TextBox>
</td>

But the onkeypress(this) event returns object required error in that function at this place

var amount = document.getElementById(txt).value;

What's my mistake here?

Instead of using this:

onkeypress="return fun_AllowOnlyAmountAndDot(this);"

You should use this:

onkeypress="return fun_AllowOnlyAmountAndDot(this.id);"

[Solved] Text box should only accept only numbers and dot , Handled = true; } // only allow one decimal point if (e. Text box accept only numbers instead of letters or special characters u can do that using javascript fuction .make a java script function in head tag and call that function  In this article, we will see how to Allow only Numeric value and Only one DOT in Textbox. This example will helpful when we want to use the PRICE field in the textbox. user is not allowed to enter string value and allow only numeric and it also allows only one DOT.

How to restrict input box to allow only numbers and decimal point , Here we are allowing only decimal and integers but not any other symbol. Here are a script >. var el_up = document.getElementById("GFG_UP");. var el_down​  How to restrict input box to allow only numbers and decimal point JavaScript? The task is to validate the input when the user is typing something in the input box. Here we are allowing only decimal and integers but not any other symbol.

Use Jquery instead. Add a decimal class to your textbox:

<input type="text" class="decimal" value="" />

Use this code in your JS. It checks for multiple decimals and also restrict users to type only numbers.

$('.decimal').keyup(function(){
    var val = $(this).val();
    if(isNaN(val)){
         val = val.replace(/[^0-9\.]/g,'');
         if(val.split('.').length>2) 
             val =val.replace(/\.+$/,"");
    }
    $(this).val(val); 
});​

Check this fiddle: http://jsfiddle.net/2YW8g/

Hope it helps.

Restrict a HTML input text box to allow only numeric values, How do I allow only numbers and decimals in a text box? Expl.: Match one to three digits. Then allow any number of groups with a comma followed by three digits. If no match on previous, try any number of digits (more than one). Then allow optional decimals. Change to ^(\d{1,3}(?:,\d{3})*|\d+)\.\d+$ if decimals are mandatory. Check out regex101. Regards

Just add the code below in your input text:

onkeypress='return event.charCode == 46 || (event.charCode >= 48 && event.charCode <= 57)'

Restricting input to textbox: allowing only numbers and decimal point, How do I restrict a textbox to accept only numbers in JavaScript? Disclaimer: This site is started with intent to serve the ASP.Net Community by providing forums (question-answer) site where people can help each other. The content posted here is free for public and is the content of its poster.

function isNumberKey(evt,id)
{
	try{
        var charCode = (evt.which) ? evt.which : event.keyCode;
  
        if(charCode==46){
            var txt=document.getElementById(id).value;
            if(!(txt.indexOf(".") > -1)){
	
                return true;
            }
        }
        if (charCode > 31 && (charCode < 48 || charCode > 57) )
            return false;

        return true;
	}catch(w){
		alert(w);
	}
}
<html>
  <head>
  </head>
  <body>
    <INPUT id="txtChar" onkeypress="return isNumberKey(event,this.id)" type="text" name="txtChar">
  </body>
</html>

Allow Only Numeric Values and allow Only one DOT in TEXTBOX , Please see this article on my blog. Using Code : Write this script in Page Design Source under <Body> tag. Firstly your regex currently doesn't allow comma, which is your requirement. Secondly, you haven't used any quantifier, so your regex will match only a single character - one of [0-9] or a dot. You need to use a quantifier. Thirdly, instead of using pipe, you can move all characters inside the character class only. Try using the below regex:

allow user to enter only "Numbers" and if required, only one dot , will allow user to enter only "Numbers" and if required, only one dot ". </script​>. Note that I attached the event handler to the element in the  I need to provide a textbox which will allow user to enter only "Numbers" and if required, only one dot "." eg: 123.321. There are some examples on the web but i can not run it successfully.. Thanks for any support.

Only numbers and decimal point - PHP, Hi guys IM doing some validation How can i only allow numbers and decimal points so If you only want a number, optionally followed by a dot then more numbers, error prone than making your own script to emulate the built machine code. The question was asked and answered nearly 6 years ago! Stick to answering new questions where the OP still needs help. Also make sure you have read, understood and are answering, the question that was asked. This code will not allow any decimal points never mind ensuring only one is entered

Enter Only Numbers and Decimal Values Using jQuery, Enter or restrict only numbers and decimal values in a textbox or input control using jQuery '.class' selector and '.keypress' event. Please enable JavaScript to view this page properly. DOCTYPE html> <html> <head> <title>Enter only number using jQuery .class Selector</title> <script CHECK DOT, AND ONLY ONE. Just type in the text box below. Note that digits are allowed and alphabetic characters are not allowed. Observe, too, that arrow keys and backspace are allowed so that you can still edit what you type. To filter out different keystrokes besides numbers check out my javascript keycode page.

Comments
  • Doesn't prevent copy and paste :(
  • You can try this: onkeypress="return fun_AllowOnlyAmountAndDot(event);"
  • Thanks. Let me try with regular expressions
  • Is matches() supposed to be match()?
  • Not a regex expert, but I had to use /^[0-9-]*\.?[0-9]*$/ in order to match negative numbers. Thanks for your answer.
  • If you're looking to not match the dot alone ("."), replace the first asterisk (*) with a plus (+)
  • this doesn't work fine. Allowed multiple decimals. screencast.com/t/s43DpVAhw
  • Please explain what you did.
  • This fails when the input is "123...122", it ignores the dot if put together
  • Posting the solution is good, but it might improve your answer if you describe or highlight what the mistake was.