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?
This question is related to
javascript
asp.net
regex
validation
<input type="text" class="decimal" value="" />
$('.decimal').keypress(function(evt){
return (/^[0-9]*\.?[0-9]*$/).test($(this).val()+evt.key);
});
I think this simple solution may be.
You can use this
Javascript
function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode > 31 && (charCode < 48 || charCode > 57)&&(charCode!=46)) {
return false;
}
return true;
}
Usage
<input onkeypress="return isNumber(event)" class="form-control">
This works best for me.
I also apply a currency formatter on blur where the decimal part is rounded at 2 digits just in case after validating with parseFloat.
The functions that get and set the cursor position are from Vishal Monpara's blog. I also do some nice stuff on focus with those functions. You can easily remove 2 blocks of code where 2 decimals are forced if you want and get rid of the set/get caret functions.
<html>
<body>
<input type="text" size="30" maxlength="30" onkeypress="return numericValidation(this,event);" />
<script language="JavaScript">
function numericValidation(obj,evt) {
var e = event || evt; // for trans-browser compatibility
var charCode = e.which || e.keyCode;
if (charCode == 46) { //one dot
if (obj.value.indexOf(".") > -1)
return false;
else {
//---if the dot is positioned in the middle give the user a surprise, remember: just 2 decimals allowed
var idx = doGetCaretPosition(obj);
var part1 = obj.value.substr(0,idx),
part2 = obj.value.substring(idx);
if (part2.length > 2) {
obj.value = part1 + "." + part2.substr(0,2);
setCaretPosition(obj, idx + 1);
return false;
}//---
//allow one dot if not cheating
return true;
}
}
else if (charCode > 31 && (charCode < 48 || charCode > 57)) { //just numbers
return false;
}
//---just 2 decimals stubborn!
var arr = obj.value.split(".") , pos = doGetCaretPosition(obj);
if (arr.length == 2 && pos > arr[0].length && arr[1].length == 2)
return false;
//---
//ok it's a number
return true;
}
function doGetCaretPosition (ctrl) {
var CaretPos = 0; // IE Support
if (document.selection) {
ctrl.focus ();
var Sel = document.selection.createRange ();
Sel.moveStart ('character', -ctrl.value.length);
CaretPos = Sel.text.length;
}
// Firefox support
else if (ctrl.selectionStart || ctrl.selectionStart == '0')
CaretPos = ctrl.selectionStart;
return (CaretPos);
}
function setCaretPosition(ctrl, pos){
if(ctrl.setSelectionRange)
{
ctrl.focus();
ctrl.setSelectionRange(pos,pos);
}
else if (ctrl.createTextRange) {
var range = ctrl.createTextRange();
range.collapse(true);
range.moveEnd('character', pos);
range.moveStart('character', pos);
range.select();
}
}
</script>
</body>
</html>
<input type="text" class="form-control" id="odometer_reading" name="odometer_reading" placeholder="Odometer Reading" onblur="odometer_reading1();" onkeypress='validate(event)' required="" />
<script>
function validate(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode( key );
var regex = /[0-9]|\./;
if( !regex.test(key) ) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}
</script>
Hope this could help someone
$(document).on("input", ".numeric", function() {
this.value = this.value.match(/^\d+\.?\d{0,2}/);});
<script type="text/javascript">
function numericValidation(txtvalue) {
var e = event || evt; // for trans-browser compatibility
var charCode = e.which || e.keyCode;
if (!(document.getElementById(txtvalue.id).value))
{
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
else {
var val = document.getElementById(txtvalue.id).value;
if(charCode==46 || (charCode > 31 && (charCode > 47 && charCode < 58)) )
{
var points = 0;
points = val.indexOf(".", points);
if (points >= 1 && charCode == 46)
{
return false;
}
if (points == 1)
{
var lastdigits = val.substring(val.indexOf(".") + 1, val.length);
if (lastdigits.length >= 2)
{
alert("Two decimal places only allowed");
return false;
}
}
return true;
}
else {
alert("Only Numarics allowed");
return false;
}
}
}
</script>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtHDLLevel" MaxLength="6" runat="server" Width="33px" onkeypress="return numericValidation(this);" />
</div>
</form>
<script type="text/Javascript">
function checkDecimal(inputVal) {
var ex = /^[0-9]+\.?[0-9]*$/;
if (ex.test(inputVal.value) == false) {
inputVal.value = inputVal.value.substring(0, inputVal.value.length - 1);
}
}
</script>
try This Code
var check = function(evt){_x000D_
_x000D_
var data = document.getElementById('num').value;_x000D_
if((evt.charCode>= 48 && evt.charCode <= 57) || evt.charCode== 46 ||evt.charCode == 0){_x000D_
if(data.indexOf('.') > -1){_x000D_
if(evt.charCode== 46)_x000D_
evt.preventDefault();_x000D_
}_x000D_
}else_x000D_
evt.preventDefault();_x000D_
};_x000D_
_x000D_
document.getElementById('num').addEventListener('keypress',check);<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
<title>Page Title</title>_x000D_
</head>_x000D_
<body>_x000D_
<input type="text" id="num" value="" />_x000D_
_x000D_
_x000D_
_x000D_
</body>_x000D_
</html>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.
Try this for multiple text fileds (using class selector):
var checking = function(event){_x000D_
var data = this.value;_x000D_
if((event.charCode>= 48 && event.charCode <= 57) || event.charCode== 46 ||event.charCode == 0){_x000D_
if(data.indexOf('.') > -1){_x000D_
if(event.charCode== 46)_x000D_
event.preventDefault();_x000D_
}_x000D_
}else_x000D_
event.preventDefault();_x000D_
};_x000D_
_x000D_
function addListener(list){_x000D_
for(var i=0;i<list.length;i++){_x000D_
list[i].addEventListener('keypress',checking);_x000D_
}_x000D_
}_x000D_
var classList = document.getElementsByClassName('number');_x000D_
addListener(classList);<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
<title>Page Title</title>_x000D_
</head>_x000D_
<body>_x000D_
<input type="text" class="number" value="" /><br><br>_x000D_
<input type="text" class="number" value="" /><br><br>_x000D_
<input type="text" class="number" value="" /><br><br>_x000D_
<input type="text" class="number" value="" /><br><br>_x000D_
</body>_x000D_
</html>function isNumberKey(evt,id)_x000D_
{_x000D_
try{_x000D_
var charCode = (evt.which) ? evt.which : event.keyCode;_x000D_
_x000D_
if(charCode==46){_x000D_
var txt=document.getElementById(id).value;_x000D_
if(!(txt.indexOf(".") > -1)){_x000D_
_x000D_
return true;_x000D_
}_x000D_
}_x000D_
if (charCode > 31 && (charCode < 48 || charCode > 57) )_x000D_
return false;_x000D_
_x000D_
return true;_x000D_
}catch(w){_x000D_
alert(w);_x000D_
}_x000D_
}<html>_x000D_
<head>_x000D_
</head>_x000D_
<body>_x000D_
<INPUT id="txtChar" onkeypress="return isNumberKey(event,this.id)" type="text" name="txtChar">_x000D_
</body>_x000D_
</html>function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode > 31 && (charCode < 46 || charCode > 57)) {
return false;
}
return true;
}
you should use this function and write the properties of this element ;
HTML Code:
<input id="deneme" data-mini="true" onKeyPress="return isNumber(event)" type="text"/>`
Just add the code below in your input text:
onkeypress='return event.charCode == 46 || (event.charCode >= 48 && event.charCode <= 57)'
This function will prevent entry of anything other than numbers and a single dot.
function validateQty(el, evt) {_x000D_
var charCode = (evt.which) ? evt.which : event.keyCode_x000D_
if (charCode != 45 && charCode != 8 && (charCode != 46) && (charCode < 48 || charCode > 57))_x000D_
return false;_x000D_
if (charCode == 46) {_x000D_
if ((el.value) && (el.value.indexOf('.') >= 0))_x000D_
return false;_x000D_
else_x000D_
return true;_x000D_
}_x000D_
return true;_x000D_
var charCode = (evt.which) ? evt.which : event.keyCode;_x000D_
var number = evt.value.split('.');_x000D_
if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57)) {_x000D_
return false;_x000D_
}_x000D_
};<input type="text" onkeypress='return validateQty(this,event);'>This is a great place to use regular expressions.
By using a regular expression, you can replace all that code with just one line.
You can use the following regex to validate your requirements:
[0-9]*\.?[0-9]*
In other words: zero or more numeric characters, followed by zero or one period(s), followed by zero or more numeric characters.
You can replace your code with this:
function validate(s) {
var rgx = /^[0-9]*\.?[0-9]*$/;
return s.match(rgx);
}
That code can replace your entire function!
Note that you have to escape the period with a backslash (otherwise it stands for 'any character').
For more reading on using regular expressions with javascript, check this out:
You can also test the above regex here:
Explanation of the regex used above:
The brackets mean "any character inside these brackets." You can use a hyphen (like above) to indicate a range of chars.
The * means "zero or more of the previous expression."
[0-9]* means "zero or more numbers"
The backslash is used as an escape character for the period, because period usually stands for "any character."
The ? means "zero or one of the previous character."
The ^ represents the beginning of a string.
The $ represents the end of a string.
Starting the regex with ^ and ending it with $ ensures that the entire string adheres to the regex pattern.
Hope this helps!
Source: Stackoverflow.com