From validation

form_validation.js

/**
 * Make capital on input
 *
 * @param fieldId
 * @param thisValue
 *
 * Example: onkeypress="return inputCapital(event, this.id, 100);"
 */
function inputCapital(fieldId, thisValue){
    $('#'+fieldId).val( $('#'+fieldId).val().toUpperCase() );
}


/**
 * Allow only alphabet only
 *
 * @param evt
 * @param fieldId
 * @param maxLength
 * @returns {boolean}
 *
 * Example: onkeypress="return onlyAlphabet(event, this.id, 100);"
 */
function onlyAlphabet(evt, fieldId, maxLength) {
    $("#"+fieldId).attr('maxlength', maxLength);
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (evt.shiftKey || evt.ctrlKey || evt.altKey) {
        evt.preventDefault();

    } else {
        var key = evt.keyCode;
        if (!((key == 8) || (key == 32) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) {
            evt.preventDefault();
        }
    }
    return true;
}

/**
 * Validation for only number input
 *
 * @param evt
 * @param fieldId
 * @param maxLength
 * @param alertStatus, true for alert on
 * @returns {boolean}
 *
 * Example: onkeypress="return isNumber(event, this.id, 100);"
 */
function isNumber(evt, fieldId, maxLength, alertStatus) {
    $("#"+fieldId).attr('maxlength', maxLength);
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        if(alertStatus){
            alert("Only number allowed.");
        }
        return false;
    }
    return true;
}

/**
 * Allow only float as amount
 *
 * @param evt
 * @param fieldId
 * @param maxLength
 * @returns {boolean}
 *
 * Example: onkeypress="return isFloat(event, this.id, 100);"
 */
function isFloat(evt, fieldId, maxLength) {
    $("#"+fieldId).attr('maxlength', maxLength);
    evt = (evt) ? evt : window.event;
    if ((evt.which != 46 || $('#'+fieldId).val().indexOf('.') != -1) && (evt.which < 48 || evt.which > 57)) {
        evt.preventDefault();

    }else{
        return true;
    }

}

/**
 * Validation for mobile number input
 *
 * @param evt
 * @param fieldId
 * @param maxLength
 * @param alertStatus, true for alert on
 * @returns {boolean}
 *
 * Example: onChange="isMobile(evt, 'fieldId', '11', true)"
 */
function isMobile(evt, fieldId, maxLength, alertStatus){
    var mobileNo = $('#'+fieldId).val();
    var mobileLength = mobileNo.length;
    if( mobileLength > maxLength ){
        if(alertStatus){
            alert("Mobile number can not be more than "+maxLength+" digits.");
        }
        return false;

    }else if(!isNumber(evt, fieldId, maxLength, false)){
        if(alertStatus){
            alert("Invalid key press.");
        }

        return false;

    }else{
        return true;
    }
}

function validateEmail(thisValue) {
    var re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    return re.test(thisValue);
}