Frontend Error
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rarely go right all the time in the real world. Error handling is a vital part of any error handling best practices application's user experience, and if done well, can leave your users reactjs error handling feeling informed and properly considered. Most errors that an application encounters can be grouped into a few
React Error Handling
categories: Input Errors: Information provided by the user is unacceptable for some reason. This includes errors from form validation, duplicate actions, uniqueness issues, resources not found, etc. Authorization
Ajax Error Handling
Errors: A user is attempting to perform an action to which he/she does not have permission. Availability Errors: A resource that is needed to complete the user's action is unavailable for some reason. This may be expected (scheduled maintenance) or unexpected (server crash!). Unexpected Errors: These are errors that likely indicate a bug in the application, such javascript error handling as unhandled exceptions. Almost every application will have instances of each of these error categories at some point. Handling each appropriately is key to keeping users who encounter errors from becoming angry users. Front-End vs. Back-End Error Handling In web application back-ends, expected errors are usually handled by displaying or responding with some kind of error message, while unexpected errors will short circuit the normal response process and display a generic error page. Applications that are very poorly configured might even spit out internal error details to the end user. For the most part, back-end applications are not always good at helping a user recover from an error, but they are pretty good at letting the user know something is wrong. Front-end applications, for better or worse, have no built-in mechanism for halting everything and displaying an error message. When a JavaScript error occurs, usually one of three things happens: The application keeps running, but something the user expected to happen doesn't happen. The most common user response to
this test: Disconnect network Click notifications bubble Expect: Some visual indication that I clicked on the bubble. Anything!Actual: Uncaught promise is logged to the console and no header popup is shown. Disconnect network Click logo Expect: Some sort of graceful degradationActual: Infinite loading spinner Additionally, it would be nice if the backend had cleaner paths to error returning. If I look at application_controller.rb, I see at least 4 utility functions https://staticapps.org/articles/front-end-error-handling/ for returning an error: handle_unverified_request returns a 403 with the text ['BAD CSRF']. This is handled by Discourse.ajax(). rescuing from RateLimiter::LimitExceeded returns 429 with a JSON object with an errors array and a time_left parameter. rescuing from Discourse::NotLoggedIn either redirects to / or returns a 403 with failed_json.merge, adding a message string. Similarly, https://meta.discourse.org/t/project-better-frontend-error-handling/14336 but a little differently, rescuing from Discourse::ReadOnly returns a 405 with failed_json merged with a message. Discourse::NotFound and Discourse::InvalidAccess call rescue_discourse_actions, which has such weird behavior, I'm going to need subbullets to explain it: If the request is from the URL bar or an external link, the 'Not Found' page with a login button is returned. (example) If the request is from JS, but the status is 404, the Not Found page is returned anyways. If the request is from JS and the status isn't 404, it renders plaintext: either [error: 'not found'] or [error: 'invalid access']. Both of these, and the Not Found page, are guaranteed to break the JSON parser. Other controllers use the failed_json.merge method, but there's even another error path: render_json_error which is called with an ActiveRecord object and serializes its .errors.full_messages. admin/screened_ip_addresses_controller provides a nice example of this here. Just as an extra punch in the face, if you're running in developm
your username? Create an account Forum Support Forum Joomla 3.x Templates Lofthouse [SOLVED] Can't see the Frontend - Error 404 (localhost) TOPIC: [SOLVED] Can't see the Frontend - Error 404 (localhost) Can't see the Frontend - Error 404 (localhost) 7 months 4 hours ago #1 Nesto Offline Hi. I've installed the Lofthouse template with quickstart pack https://www.joomlaplates.com/forum/j3-lofthouse/5909-solved-can-t-see-the-frontend-error-404-localhost in localhost with MAMP. After that, I've upgraded Joomla version to the latest stable (3.4.8) and everything goes fine, untill today who I can't see the frontend of the site. The backend works fine and the problem is in https://www.youtube.com/watch?v=kZj8LG8BilE the template, because when I choose Protostar for default, the frontend shows again. It's rare because in the first two days everything works fine, but now suddenly can't see the frontend of the site. I'm using MAMP with error handling 5.6.10 php version Have any idea about that issue? Thanks. The administrator has disabled public write access. Can't see the Frontend - Error 404 (localhost) 7 months 4 hours ago #2 joomlaplates Offline Maybe you have delete the content of the home menu item!! And a home menu item must be published too. The administrator has disabled public write access. Can't see the Frontend - Error 404 (localhost) 7 months 3 hours ago #3 Nesto Offline Hi error handling best again. Thanks for your quick answer. I've published a Home menu item who shows a single article in the main page. The home page was looking good untill this suddenly 404 error and blank frontend page issue appears. Maybe is the PHP version or something like that. I was working in MAMP with the PHP version 5.6.10 Lofthouse template can run with this version? I'm going to upload the site to a remote server with php 5.4 and see what's happen. The administrator has disabled public write access. Can't see the Frontend - Error 404 (localhost) 7 months 2 hours ago #4 joomlaplates Offline The theme is working with PHP > 5.6 but maybe Joomla need a smaller PHP version. The administrator has disabled public write access. Can't see the Frontend - Error 404 (localhost) 7 months 48 minutes ago #5 Nesto Offline Same problem in the server. I've upload the site and import database but Error 404 still. PHP version of this GoDaddy server is 5.4 The backend works fine, but the frontend give a blank page with an error 404. When I choose Protostar for default template, frontend shows normally. The administrator has disabled public write access. Can't see the Frontend - Error 404 (localhost) 7 months 18 minutes ago #6 joomlaplates Offline Ok, I will take a look. Can I get admin access, therefore please use
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