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I have this JavaScript function that is used to force user only type number in the textbox. Right now and I want to modify this function so it will allow the user to enter plus (+) symbol. How to achieve this?
//To only enable digit in the user input
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
797
Keycode 13 is the Enter key.
By default, HTML 5 input field has attribute type=”number” that is used to get input in numeric format. Now forcing input field type=”text” to accept numeric values only by using Javascript or jQuery. You can also set type=”tel” attribute in the input field that will popup numeric keyboard on mobile devices.
The charCode property returns the Unicode character code of the key that triggered the onkeypress event. The Unicode character code is the number of a character (e.g. the number "97" represents the letter "a").
Since the '+' symbol's decimal ASCII code is 43, you can add it to your condition.
for example :
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode != 43 && charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
This way, the Plus symbol is allowed.
125
It's Work. Javascript keycode allow number and plus symbol only
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript form validation</title>
</head>
<body>
<form name="form1" action="#">
Mobile Number: <input type='text' id='PhoneNumber' maxlength="10" onKeyPress="return IsNumeric3(event);" ondrop="return false;" onpaste="return false;"/>
<span id="error3" style="color: Red; display: none">* Input digits (0 - 9)</span>
</form>
<script type="text/javascript">
var specialKeys = new Array();
specialKeys.push(8);
specialKeys.push(43);
specialKeys.push(37);
specialKeys.push(39);
//Backspace
function IsNumeric3(e) {
var keyCode = e.which ? e.which : e.keyCode
var ret = (keyCode != 37 && keyCode != 8 && keyCode != 46 && (keyCode >= 48 && keyCode <= 57) || specialKeys.indexOf(keyCode) != -1);
document.getElementById("error3").style.display = ret ? "none" : "inline";
return ret;
}
</script>
<script>
function stringlength(inputtxt, minlength, maxlength)
{
var field = inputtxt.value;
var mnlen = minlength;
var mxlen = maxlength;
if(field.length<mnlen || field.length> mxlen)
{
alert("Please input the 10 digit mobile number");
return false;
}
else
{
return true;
}
}
</script>
</body>
</html>Thank you friends
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