Handling 404 Error In Javascript
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Javascript Check 404
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each other. Join them; it only takes 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
Javascript Detect 404 Image
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 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 = try catch 404 error javascript 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 codes. Hope this helps Josh share|improve this answer edited May 24 '15 at 20:40 TheShalit 1,37531232 answered May 24 '15 at 19:55 Josh Stevens 1,413210 the point is not ot show the error status, it isn'a problem. The problem is to cath 404 and manage console not to show it to user. This JavaScrip APP is just a little part of page, so WINDOW.ONERROR is too massive solution))) –Tesmen May 24 '15 at 22:16 well just do if(xhr.status == "404") and then pass it into your manage cons
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies xmlhttprequest 404 not found of this site About Us Learn more about Stack Overflow the company try catch javascript Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges javascript error handling best practices Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: http://stackoverflow.com/questions/30426277/catch-a-404-error-for-xhr Sign up Eliminate 404 url error in console? up vote 6 down vote favorite 1 I try to eleminate an 404 error occuring because the source (src) is missing.. var $chart = $("") .addClass("trend-pic") .error(function(){ console.log("error loading..") }); try{ $chart.attr("src", jobs[counter].url + "test/trend") }catch(err){ $chart.attr("src", ""); } if tried many stuff to catch the error i.e. putting an .error(function(){}) at the http://stackoverflow.com/questions/12915582/eliminate-404-url-error-in-console end. use the $chart.load() - method to check if the images gets loaded? Non of those helped? GET {myURLString} 404 (Not Found) Browser: Safari javascript jquery safari console web-inspector share|improve this question edited Oct 16 '12 at 13:51 Christoph 31.2k85483 asked Oct 16 '12 at 13:18 user1750098 3112 That is not an error that you can prevent other than making sure the image is always there. You have to make the request it will show up in the network requests/console. –epascarello Oct 16 '12 at 13:22 1 Its telling you a 404 error occurred because a 404 error did occur. The only way to avoid it would be to use a proxy script on the server –Alex K. Oct 16 '12 at 13:22 1 see this article: stackoverflow.com/questions/7035466/… –BishopZ Feb 15 '13 at 17:45 add a comment| 3 Answers 3 active oldest votes up vote 0 down vote You can't really delete those 404 errors from the console. The best you can do is make some ajax calls and see the return code, but then you'll be limited to req
JavaScript, has been maturing since the dark ages of Netscape and IE4. No longer are you forced to settle for what the browser throws in your face in an event of a JavaScript error, but instead can take the matter into http://www.javascriptkit.com/javatutors/trycatch.shtml your own hands. The try/catch/finally statement of JavaScript lets you dip your toes into error prune territory and "reroute" when a JavaScript "exception" is encountered. Along with other defensive coding techniques such as Object https://community.tableau.com/message/284000 detection and the onError event, try/catch/finally adds the ability to navigate around certain errors that in the past would have instantly stopped your script at its tracks. No more! try/catch/finally try/catch/finally are so called exception 404 error handling statements in JavaScript. An exception is an error that occurs at runtime due to an illegal operation during execution. Examples of exceptions include trying to reference an undefined variable, or calling a non existent method. This versus syntax errors, which are errors that occur when there is a problem with your JavaScript syntax. Consider the following examples of syntax errors versus exceptions: alert("I am missing a closing parenthesis //syntax handling 404 error error alert(x) //exception assuming "x" isn't defined yet undefinedfunction() //exception try/catch/finally lets you deal with exceptions gracefully. It does not catch syntax errors, however (for those, you need to use the onerror event). Normally whenever the browser runs into an exception somewhere in a JavaScript code, it displays an error message to the user while aborting the execution of the remaining code. You can put a lid on this behaviour and handle the error the way you see fit using try/catch/finally. At its simplest you'd just use try/catch to try and run some code, and in the event of any exceptions, suppress them: try{ undefinedfunction() } catch(e){ //catch and just suppress error } Assuming undefinedfunction() is undefined, when the browser runs the above, no errors will be shown. The syntax for try/catch/finally is a try clause followed by either a catch or finally clause (at least one or both of them). The catch clause if defined traps any errors that has occurred from try, and is indirectly passed the error object that contains additional info about the error. Lets see a slightly more complex example now: try{ undefinedfunction() alert('I guess you do exist') } catch(e){ alert('An error has occurred: '+e.message) } Demo: Click on the above butt
9 Replies Latest reply on Jun 6, 2016 8:35 AM by Shabeer Sheffa Javascript API - catching errors Benoit Boireau Jul 10, 2014 12:16 AM Hello,I use the javascript API to embed views from Tableau Server, and I wonder how I can catch the errors thrown by the server (Tableau internal errors, or errors that occur when the client lose its network connection for example) : I would like my application to be aware of these errors.The documentation is missing an example about this : I don't understand where do I need to put my try/catch block, as all my calls to the API are asynchronous.Has someone already done this ?Thanks for you help,Regards,Benoît I have the same question Show 1 Likes(1) 4936Views Tags: none (add) serverContent tagged with server, errorContent tagged with error, javascriptContent tagged with javascript, apiContent tagged with api, tryContent tagged with try, catchContent tagged with catch This content has been marked as final. Show 9 replies 1. Re: Javascript API - catching errors Nay Lin Soe Sep 29, 2014 11:15 PM (in response to Benoit Boireau) Hi Benoît,I'm exactly in the same boat as yours. I use JS API to embed dashboards. Time to time, I get '500 Internal Server Error' from Tableau Server. However, I haven't found a way of handling that error, i.e. my application detecting it and reponding appropriately. I can see the error only because I have got Firebug installed.As I understand, the viz is loaded asynchronously when new tableauSoftware.Viz(placeholderDiv, url, options) is executed. In 'option' we can attach a function to 'onFirstInteractive' which is roughly equivalent to 'success' call back. But there is no option to attach a function when errors like this occurs. I've tried putting the above in try-catch block, but no exceptions are thrown.So I am very keen to know as well how to handle these network errors. Could anyone from Tableau help us out please? Thanks.Nay Like Show 0 Likes(0) Actions 2. Re: Javascript API - catching errors Ryan Grant Oct 14, 2014 2:09 PM (in response to Benoit Boireau) Similar boat as well. In my case, if I initialize a new viz object for a user who does not have permission to view the report, the "onFirstInteractive" success callback is never called an