Regular Expression to allow only Decimal number in jQuery

chetan

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User: chetan
Posted: on Sep 16, 2019 05:19 AM
Forum: jQuery and jQuery Plugins
Answer: 1
Views: 9053
Sample Code: Download

I wanted to add validation for the below code such that:

var metR = $(this).val();
var regex = /((\d+)(\.\d{1}))$/;
if (metR != '') {
    if (!regex.test(metR)) {
        var itemRow = "<ul id='listError'><li>" + "The Proposed Meter Reading is Invalid" + " " + "</li></ul>";
        FUNMessageBox(itemRow, "E", 700, 200, "", "");
        rv = false;
        return false;
    }
}

Currently it is validating like: 123.0(Valid) 46466.7(Valid) When user enters, 123 .0 or 123. 0 it is taking the value.

123 .0 (invalid)

123. 0 (invalid) when user enter spaces between digits,message should appear as "The reading is invalid"

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dharmend...

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ANSWER
User: dharmendr
Replied: on Sep 16, 2019 05:23 AM
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Hi chetan,

The code is working as expected. Refer below demo.

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $('#txtValue').on('change', function () {
                var metR = $(this).val();
                var regex = /((\d+)(\.\d{1}))$/;
                if (metR != '') {
                    if (!regex.test(metR)) {
                        alert('The reading is invalid');
                        return false;
                    } else {
                        alert('The reading is valid');
                    }
                }
            });
        });
    </script>
    <input name="txtValue" type="text" id="txtValue" />
    </form>
</body>
</html>

Demo

I agree, here is the link: https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html

Regular Expression to allow only Decimal number in jQuery

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