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author= Aviv Ben-Yosef;
description= We knew this was a long time coming, and it’s finally here.
The Angular Team has announced that they will soon release AngularJS 1.7.0, which will be …;
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grading it requires upgrading other dependencies but since things have been left stale you have to sift through so many breaking changes of dependencies and that s if you re lucky and the dependencies have proper documentation for example i recently saw a client that needed a simple update to their e2e testing framework require upgrading 8 more direct dependencies some as major as oh we need to upgrade a major node version for this and update our ci chain with it ain t nobody got time for that the just right upgrade path the pragmatic solution maybe obvious at this point is to have a process for upgrading gradually and with a schedule if you re in it for the long game and plan on supporting your product for years on you have to get some recurring task that reminds you to go over your dependencies and see which have updates that are say a month old go over those read their changelogs make the changes necessary to upgrade and test things in isolation yeah it s a hassle to do this in an ongoing fashion but from my experience it s always easier than dragging it out until the absolute last minute when you ve already got balls to the wall maintaining angularjs feels like cobol you want to do angularjs the right way yet every blog post you see makes it look like your codebase is obsolete components lifecycle hooks controllers are dead it would be great to work on a modern codebase again but who has weeks for a rewrite well you can get your app back in shape without pushing back all your deadlines imagine upgrading smoothly along your regular tasks no longer deep in legacy subscribe and get my free email course with steps for upgrading your angularjs app to the latest 1 6 safely and without a rewrite success you rock you ll get some knowledge shipped to your inbox soon let s do this get the modernization email course there was an error submitting your subscription please try again email address subscribe reliably managing modals in angularjs dec 11 th 2017 comments the devil s in the details and you know what s full of details managing modals popups and dialogs in a single page app you want to reliably display them yet it s super easy to have bugs turning up with them such as a modal staying stuck on top of your ui even though the underlying state has changed for example twitter s current ui whenever you click a tweet s timestamp that tweet is displayed as a modal on top of the current page you re on and from that screen you can stack up even more modals e g by clicking to view who liked or retweeted that tweet managing all those modals can be a pita you have to make sure clicking a link that goes someplace else dismisses all the modals that should be dismissed and on the other hand you have to make sure that dismissing the modal e g by clicking that x button results in the state changing together i ve often seen this result in lots of copy pasted code for handling dismissals and listening for state changes to clear things up actually while playing around with twitter to get the screenshot for this post i noticed that simply clicking through some modals breaks things in twitter such as history in some of the cases but it doesn t have to be this hairy and buggy you don t have to keep adding more and more checks for removing your modals everywhere in the hopes of it actually sticking with the right design decisions modals can work almost as seamlessly as regular bindings in angularjs reliable modals a reliable pattern that i ve seen successfully implemented at several clients is to bind modals to a matching router state there are different ways this can be done but the important issue is accepting the idiom that modals shouldn t ever cross state changes if a state is left the modals it introduced should be cleared let the new state start fresh and clean of the previous thing the simple way auto dismissals this is by far the simplest way to make sure modals never stick around and it works for apps with simple modal use i ve seen this working for years at several places and reliably essentially you register a state change listener in your router and whenever there s a state change you make sure to dismiss all open modals whatever those might be again this might seem harsh but in some apps this works like a charm and is better than nothing a simple example using ui router s transition service and angular ui bootstrap s uibmodalstack this can be as simple as 1 2 3 transitions onfinish function transition uibmodalstack dismissall and of course if needed you can only perform this for transitions that match a specific criteria hard binding modals and states the hard binding solution is also the harder way but it provides more flexibility and control in this pattern we configure the different states so that whenever a state is opened a specific modal is initialized whenever that state is transitioned from that same specific modal is dismissed and lastly we make sure that if the modal is dismissed e g by clicking a little x the state itself is transition out from usually by going to its parent state for example the tweet details modals from the screenshot above might be defined like this state 1 2 3 4 5 6 7 8 9 10 11 stateprovider state profile tweet url tweet tweetid onenter function uibmodal 1 uibmodal open finally function 3 state go onexit function 2 dismiss modal breaking this down first look at the line marked with 1 onenter is called as the state is initialized and then we immediately open up the modal that is bound to this state similarly on line 2 we make sure to use onexit to be notified of when the state is transitioned from and dismiss the modal in case it s still there finally on line 3 we make absolutely sure that any dismissal of the modal for any reason will also result in a transition to a proper state we do that by adding a finally callback to the modal s dismissal promise this boils down to manually wiring two way binding between the state and the modal and it achieves air tight confidence in your modals playing along nicely maintaining angularjs feels like cobol you want to do angularjs the right way yet every blog post you see makes it look like your codebase is obsolete components lifecycle hooks controllers are dead it would be great to work on a modern codebase again but who has weeks for a rewrite well you can get your app back in shape without pushing back all your deadlines imagine upgrading smoothly along your regular tasks no longer deep in legacy subscribe and get my free email course with steps for upgrading your angularjs app to the latest 1 6 safely and without a rewrite success you rock you ll get some knowledge shipped to your inbox soon let s do this get the modernization email course there was an error submitting your subscription please try again email address subscribe preferred angularjs communication patterns sep 29 th 2017 comments a very common head scratch moment with angularjs is whenever one needs to decide on how to communicate and pass information between a couple of components as you learn more about angularjs it actually gets more confusing since there seem to be so many ways which is the right one for your scenario i compiled here the common patterns and anti patterns sorted and listed from you should probably use this all the way to please god no always use when possible bindings bindings essentially mean passing a callback function a child component so it can call back on the parent use this whenever a child needs to pass information to its direct parent e g a button was clicked or an error occurred onchanges the onchanges lifecycle hook which i covered here coupled with one way data flow can be used as the opposite of callback bindings by supplying a one way binding to a child component the parent can essentially trigger behavior in the child by overriding the binding value with a new one causing the child s onchanges to be called then the child component can see which binding has changed and to which value and act accordingly use with care having to use these might mean that you re doing something a bit too complicated but not always require the require mechanism is strong and provides a lot of power as described here and here it can really simplify complex component families and yet don t be trigger happy about using it since it also adds complexity add a service with extra state this actually has been the go to solution for most non obvious communication patterns in the angularjs of old people would just create these services which essentially were just global state and inject them everywhere that needed access to something frankly these are just a tiny bit better than putting lots of crap on your rootscope and i don t think it should be used in most codebases more than handful of times and kept to a minimum try to never use unless absolutely necessary watch well watch is still useful of course when you have to deeply watch some object or when integrating with external libraries that don t expose proper events or promises and yet these are rare scenarios if all you need to do is know when a binding you got is changed push that code to onchanges and be done with it never use well 99 9999 of the cases events angularjs s scopes have broadcasting capabilities e g broadcast and emit these allow passing messages between parent and child components across multiple layers having worked on dozens of angularjs projects i frankly don t believe i cam across a codebase that incorporated these as a standard pattern and didn t come to regret it later events when used freely usually end up causing code to be come a big spaghetti mess do note though that there are cases these events are useful e g for implementing some sort of subscription mechanism for listening to changes in external data like in your store services you can see an example of such a service here did i miss any important patterns let me know maintaining angularjs feels like cobol you want to do angularjs the right way yet every blog post you see makes it look like your codebase is obsolete components lifecycle hooks controllers are dead it would be great to work on a modern codebase again but who has weeks for a rewrite well you can get your app back in shape without pushing back all your deadlines imagine upgrading smoothly along your regular tasks no longer deep in legacy subscribe and get my free email course with steps for upgrading your angularjs app to the latest 1 6 safely and without a rewrite success you rock you ll get some knowledge shipped to your inbox soon let s do this get the modernization email course there was an error submitting your subscription please try again email address subscribe angular 1 6 s possibly unhandled rejection errors aug 20 th 2017 comments if you ve updated to angularjs 1 6 x kudos there s not much that s needed to get an app running with 1 5 to work with 1 6 but a very common error that starts appearing in people s consoles after this upgrade is the dreaded possibly unhandled rejection error did you see this and wonder what does this mean and more importantly how the hell do you get rid of it worse if you just follow the highest voted answer on stackoverflow you probably hide bugs and won t be aware of it read on for the full gist what does this error mean essentially this error is printed to the console whenever a promise in your app is rejected resolved with a failure and there s no catch block to handle that failure angularjs added this to nudge developers to always handle possible errors this is much like always adding an else to every if to make sure you handle error cases etc after all every unhandled rejection might be an error that you forgot to account for a bug waiting to happen a very common reason for it to come up in apps is things like modals being dismissed or canceled and since the app has nothing to do in those scenarios the rejected promise goes unhandled getting rid of it the icky way the stack overflow answer i linked to above basically shows you how to disable this new behavior introduced in 1 6 1 2 3 app config function qprovider qprovider erroronunhandledrejections false you might be tempted to just reach for this quick fix but be aware that it doesn t 100 resemble that behavior in 1 5 the catch say that you make a simple typo like we all do like 20 times a day for example you re handling a response from http that looks like this value stuff now spot the typo 1 2 3 http get stuff then function result handleresult result valye of course i mistyped value as valye this code in version 1 5 x would result in an error in your console so would it in 1 6 unless you turn off unhandled rejection errors if you do it this error would be swallowed and you ll be spending lots and lots of time debugging stuff that s why i recommend solving this the right way even though it might take more typing unless you really really have no other choice getting rid of it the right way well the trick to not having unhandled rejection errors is well handling them you should after every every promise with a then block have a catch block and no finally blocks don t help here 1 2 3 4 5 http get stuff then function result stuff here catch function handle errors and what about cases where you absolutely don t care about errors the convention i d have to recommend is explicitly handling errors in a way that says you re aware of possible errors and don t care 1 2 3 http get stuff then function result stuff here catch angular noop look here we re passing as a handler the angular noop function which a function that does nothing it s the equivalent of function this saves you some typing and whenever i see noop as opposed to an empty function i know it was left there by intention and not that someone forgot what they were doing half way through a commit yeah this is some more typing but it s all in favor of making more robust and bug free apps and i recommend setting up a shortcut in your favorite editor to add this e g my textexpander is set up to write catch angular noop whenever i type noop happy erring maintaining angularjs feels like cobol you want to do angularjs the right way yet every blog post you see makes it look like your codebase is obsolete components lifecycle hooks controllers are dead it would be great to work on a modern codebase again but who has weeks for a rewrite well you can get your app back in shape without pushing back all your deadlines imagine upgrading smoothly along your regular tasks no longer deep in legacy subscribe and get my free email course with steps for upgrading your angularjs app to the latest 1 6 safely and without a rewrite success you rock you ll get some knowledge shipped to your inbox soon let s do this get the modernization email course there was an error submitting your subscription please try again email address subscribe advanced ng model integration for bug free controls aug 6 th 2017 comments in the last post i explained that developers have a lot to ...
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