Amit Dhamu

Writes Code

Restrict Input to Numbers

// HTML
<input type="text" name="inputTxt" onkeypress="return numbersonly(this, event);"/>

// JavaScript Function
function numbersonly(myfield, e, dec) {
    var key;
    var keychar;

    if (window.event) {
        key = window.event.keyCode;
    } else if (e) {
        key = e.which;
    } else {
        return true;
    }
    keychar = String.fromCharCode(key);

    if ((key == null) || (key == 0) || (key == 8) || (key == 9) || (key == 13) || (key == 27)) {
        // control keys
        return true;

    } else if ((("0123456789.").indexOf(keychar) > -1)) {
        // numbers
        return true;

    } else if (dec && (keychar == ".")) {
        // decimal point jump
        myfield.form.elements[dec].focus();
        return false;

    } else {
        return false;
    }
}


restrict input / javascript

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