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Reusable JS Functions for Field Validation in Oracle APEX Forms

 These reusable JavaScript functions provide client-side validation for Oracle APEX forms, improving data accuracy before submission.

They allow developers to enforce mandatory fields and ensure certain fields contain only numeric values.

By using these functions, APEX forms become more user-friendly and robust, reducing the chance of invalid data entry.

Step 1: Create a Static Content region on the Global Page using the Blank with Attributes template.
Step 2: Paste the following code into the HTML Source section of the region.

<script>
    function validateInputField(inputFieldId, pageItemName, errorMessage) {
        $(inputFieldId).focusout(function() {
            var itemValue = apex.item(pageItemName).getValue();
            apex.message.clearErrors(pageItemName);
            if (!itemValue) {
                apex.message.showErrors([
                    {
                        type: "error",
                        location: ["page", "inline"],
                        pageItems: [pageItemName],
                        message: errorMessage,
                        unsafe: false
                    }
                ]);
                $(inputFieldId).focus();
            } else {
                apex.message.clearErrors();
            }
        });
    }

function validateNumericField(inputFieldId, pageItemName, errorMessage) {
    $(inputFieldId).focusout(function() {
        var itemValue = apex.item(pageItemName).getValue();
        apex.message.clearErrors(pageItemName);
        if (itemValue && !/^\d+$/.test(itemValue)) {  
            apex.message.showErrors([{
                type: "error",
                location: ["page", "inline"],
                pageItems: [pageItemName],
                message: errorMessage,
                unsafe: false
            }]);
            $(inputFieldId).focus();
        }else {
                apex.message.clearErrors();
            }
    });
}
</script>


Step 3: On any page where you want to apply this validation, call this function in the page’s Function and Global Variable Declaration section as shown below.

validateInputField('#P6_NAME', 'P6_NAME', 'Employee First Name is mandatory field');
validateInputField('#P6_FATHERNAME', 'P6_FATHERNAME', 'Employee Last Name is field');
validateNumericField('#P6_PHONE', 'P6_PHONE', 'Age must contain only numbers'); 

Step4: Save the application

The main usage of this is to provide reusable client-side validation for Oracle APEX forms, allowing developers to easily enforce mandatory fields and numeric-only inputs across multiple pages.
It improves data accuracy, gives instant inline feedback to users, and reduces server-side validation errors.

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