In this article, I am going to explain how to validate
value in JavaScript in ASP.NET C#.
Check Value is integer or not (like Age)
Check Valid Amount or not
The given below function checks you enter the valid amount or not, it also not accepts the double dot.
Check Value is integer or not (like Age)
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<script
type="text/javascript">
function isNumber(evt) {
evt = (evt) ? evt :
window.event;
var charCode = (evt.which) ? evt.which
: evt.keyCode;
if (charCode > 31 && (charCode < 48 ||
charCode > 57)) {
return false;
}
return true;
}
</script>
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aspx textbox
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<asp:TextBox
ID="txtAge"
runat="server"
onkeypress="return
isNumber(event)" onpaste="return
false"></asp:TextBox>
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onkeypress="return isNumber(event)"
allow you only enter the integer value only.
Check Value is character or not
If you want textbox only accepts the character you can use the given below
function
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<script
type="text/javascript">
function checkChar(e) {
var key;
if (e.keyCode) key = e.keyCode;
else if (e.which) key = e.which;
if (/[^A-Za-z0-9]/.test(String.fromCharCode(key))) {
return false;
}
}
</script>
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aspx textbox
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<asp:TextBox
ID="txtchar"
runat="server"
onkeypress =
"return checkChar(event)"></asp:TextBox>
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Check Value is String or not (Like Name)
If you want textbox only accepts the strings you can use the given below
function
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<script
type="text/javascript">
function ValidateText(evt) {
var keyCode = (evt.which) ? evt.which : evt.keyCode
if ((keyCode < 65 || keyCode > 90) && (keyCode < 97 || keyCode >=
123) && keyCode != 32)
return false;
return true;
}
</script>
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aspx textbox
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<asp:TextBox
ID="txtName"
runat="server"
onkeypress="return
ValidateText(event)" onpaste="return
false" >
</asp:TextBox>
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Check validate PAN Number
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<script
type="text/javascript">
function fnValidatePAN(Obj) {
if (Obj == null) Obj =
window.event.srcElement;
if (Obj.value != "") {
ObjVal = Obj.value;
var panPat = /^([a-zA-Z]{5})(\d{4})([a-zA-Z]{1})$/;
var code = /([C,P,H,F,A,T,B,L,J,G,M])/;
var code_chk = ObjVal.substring(3, 4);
if (ObjVal.search(panPat) == -1) {
alert("Invalid
Pan No");
Obj.focus();
return false;
}
}
}
</script>
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aspx textbox
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<asp:TextBox
ID="txtPanNumber"
runat="server"
MaxLength="10"
onblur="fnValidatePAN(this);"
style="text-transform:uppercase"
onpaste="return
false" ></asp:TextBox>
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Check validate Email ID
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function
checkEmail(Obj) {
if (Obj.value != "") {
if
(/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/.test(Obj.value)) {
}
else {
alert("Enter
a valid email address!")
Obj.focus();
return (false)
}
}
}
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aspx textbox
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<asp:TextBox
ID="txtEmailID"
runat="server"
MaxLength="50"
onpaste="return
false" onblur="checkEmail(this)"></asp:TextBox>
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Check at least one
radio button list is checked
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<script
type="text/javascript">
function EmptyData() {
var checkData = "No";
var Listpaytype = document.getElementById("rbtnListpaytype");
var inputs = Listpaytype.getElementsByTagName('input');
for
(var i = 0; i < inputs.length; i++) {
if (inputs[i].checked ==
true) {
checkData =
"Yes";
PaymentCheckValue = inputs[i].value;
break;
}
}
if
(checkData == "No") {
alert("Please
Select At least a Gender");
return false;
}
}
</script>
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aspx RadioButtonList ( when you click on button it checks at least one
radio button list is cheeked or not).
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<asp:RadioButtonList
ID="rbtnListGendertype"
runat="server"
CssClass="rdolbl"
RepeatDirection="Horizontal">
<asp:ListItem>Male</asp:ListItem>
<asp:ListItem>Female</asp:ListItem>
<asp:ListItem>Other</asp:ListItem>
</asp:RadioButtonList></td>
<asp:Button
ID="btnCheck"
runat="server"
Text="Check"
OnClientClick="return
EmptyData();"/>
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The given below function checks you enter the valid amount or not, it also not accepts the double dot.
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<script
type="text/javascript">
function isNumberKey(evt, obj) {
var charCode = (evt.which) ? evt.which : event.keyCode
var value = obj.value;
var dotcontains = value.indexOf(".")
!= -1;
if (dotcontains)
if (charCode == 46)
return false;
if (charCode == 46) return
true;
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
</script>
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aspx textbox
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<asp:TextBox
ID="txtAmount"
runat="server"
onkeypress="return
isNumberKey(event,this)" onpaste="return
false"></asp:TextBox>
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