Validate a number : Validation « Form Control « JavaScript DHTML

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JavaScript DHTML » Form Control » Validation 
Validate a number

function processNumber(inputField) {
    try {
        var inpVal = parseInt(inputField.value, 10);
        if (isNaN(inpVal)) {
            var msg = "Please enter a number only.";
            var err = new Error(msg);
            if (!err.message) {
                err.message = msg;
            }
            throw err;
        }
    catch (e) {
        alert(e.message);
        inputField.focus();
        inputField.select();
    }
}


           
       
Related examples in the same category
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18. InputBox: value must be between 10 and 90
19. Not stop when the first failed validation is encountered
20. A CSS is used to highlight the fields which failed to validate
21. Need to select a file
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