Handle 404 Error Javascript
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a minute: Sign up Catch a 404 error for XHR up vote 0 down vote favorite Bsically i had a necessity to create an javascript APP object, which will queue an sequence of asyncronous requests for server, process response to JSON, and log errors from it. JSON processing errors were caucht easily with "try-catch", but server errors like 404, 500 etc. are try catch 404 error javascript still shown in console of browser, while i need to silently log it in "APP.history". I tried to implement it via the code below, but none of 404 errors fires onerror. What am i doing wrong? xhr = new XMLHttpRequest(); xhr.open("GET", url, true) xhr.onerror = function(){console.log("error")} xhr.upload.onerror = function(){console.log("error")} By the way, how could it be done with jQuery AJAX? javascript jquery ajax share|improve this question asked May 24 '15 at 17:26 Tesmen 3419 You can check the xhr.status value. See stackoverflow.com/questions/10931270/… –JanSc May 24 '15 at 17:30 have a look here > stackoverflow.com/questions/1442425/…, I hope it answers your question –DKanavikar May 24 '15 at 17:38 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted status allows you to show what error has occurred. so you can do something like this xhr = new XMLHttpRequest(); xhr.open("GET", url, true) xhr.onerror = function(){console.log("error" + xhr.status)} xhr.upload.onerror = function(){console.log("error" + xhr.status)} so if its a 404 it will say in your alert "error 404" and will do the same for the rest of the co
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Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Handling 404, 500 and Exceptions in Node.js and Express http://stackoverflow.com/questions/30426277/catch-a-404-error-for-xhr up vote 0 down vote favorite I have a node.js + Express + express-handlebars app. I want to redirect the users to 404 page when they go to a page that does not exists and redirect them to a 500 when there is an internal server error or an exception(without stopping the server). In my app.js I have written the middle ware at the end to perform these http://stackoverflow.com/questions/36113101/handling-404-500-and-exceptions-in-node-js-and-express tasks. app.get('*', function(req, res, next) { var err = new Error(); err.status = 404; next(); }); //Handle 404 app.use(function(err, req, res, next){ res.sendStatus(404); res.render('404'); return; }); //Handle 500 app.use(function(err, req, res, next){ res.sendStatus(500); res.render('500'); }); //send the user to 500 page without shutting down the server process.on('uncaughtException', function (err) { console.log('-------------------------- Caught exception: ' + err); app.use(function(err, req, res, next){ res.render('500'); }); }); However only the code for 404 works. So if I try to go to an url localhost:8000/fakepage it successfully redirects me to my 404 page. The 505 does not work. And for the exception handling, the server does keep running but, it does not redirect me to the 500 error page after the console.log I am confused by so many solutions online where people seem to implement different techniques for this. Here are some of the resources I looked at http://www.hacksparrow.com/express-js-custom-error-pages-404-and-500.html Correct way to handle 404 and 500 errors in express How to redirect 404 errors to a page in ExpressJS? https://github.com/expressjs/express/blob/master/examples/error-pages/index.js javascript node.js express share|improve this question asked Mar 20 at 11:26 codeinprogress 2531414 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote The process on uncaughtexception is for the application
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