[FIXED] Spring mvc check if was BindingResult in javascript response

Issue

Is there a clear way to check if ajax success response controller returned view with validation errors?

controler:

if(result.hasErrors()) {
        return "place/add";
    }

javascript:

$.ajax({
        url : "<spring:url value="/place/add"/>",
        type : 'POST',
        data : $("#newPlaceForm").serialize(),
        success : function(response) {

How do I check if the response has no validation messages?

Solution

It's more clear to generate a HTTP response code to indicate the error.

For example: response.sendError(400, "Validation failed")

jQuery will execute the provided error handler based on the response code.

$.ajax( '/your/url').error(function (jqXHR) {
    if (jqXHR.status == 400) {
        console.log('Bad Request');
    }
});

This is more clear since handling errors in a success handler doesn't make much sense. The failed request is also easier to debug with your browsers developer tools.

Answered By - Bart
Answer Checked By - Katrina (JavaFixing Volunteer)