Some records about F5 refresh in Vue project

Herbal tea ice 2020-11-13 03:27:00
records f5 refresh vue project


Catalog

Preface

Problem description

Problem analysis

Problem solving

summary


Preface

be based on vue-cli The single page application of scaffold development has its special characteristics and advantages . Because it's a single page app , So it's going on F5 When refreshing and before the regular html The page also has a distinction . The main difference is that ,vue-router Took over the browser's advance 、 back off 、 Refresh and so on , By listening to related events , Dynamic operation popstate,pushstate,replacestate etc. api To complete the browser url The change of ; But actually for the page itself , There is no regular refresh or backward forward operation as we understand it , It's a one page app after all , The inner core is still dynamic div Switch or dom Dynamic rendering of elements .

In this article, we discuss the relationship between the two F5 Trace of refresh operation , Let's record and learn about vue How the component handles the refresh operation , each How the life cycle of a component operates , And what points should we pay attention to .

Problem description

Let's first look at a specific problem , In actual projects , After successful login, the page is a left and right structure page , Suppose it's a component A, On the left is the menu area , On the right is the display area , Our approach is to add a <router-view>, Click through the menu on the left , Dynamic changes on the right side router-view Page effects in . After the first successful landing , To display a default page , We are in the assembly A Of create Get the menu tree from , Then judge the menu of id Whether it's top level , If so, it will automatically display , Suppose the default component is B. Then choose the menu on the left , Jump to a new page , Right area rendering , Suppose we show C Components , here F5 Refresh , The page will automatically return to the component B, in other words , The refresh operation cannot be refreshed “ The current page ”, As long as the refresh will always return to the home page .

Problem analysis

We're at the root component A Of beforeRouteEnter In the hook function to、from Print out . Then we click through the menu on the left , The page jumps to manager_device_list Routing page , And then click F5 Refresh , Printed to and from as follows

You can see from Of null,to It's our current routing page , But why does it automatically jump to the home page B Yes ?

Here's to say F5 The life cycle of the component when refreshing .

F5 When refreshing , Will go back to the life cycle from the following components , That is, from root.vue Start to go back to the declaration cycle , And then go down one level at a time , according to to Route to the specific rendering page , That's the problem , Because we're following components A Of create Method in the loop menu and automatically jump to the home page , So in F5 After that, when you go back to the component declaration cycle , stay create The route has been changed in China , Instead of going back to the original to.

Problem solving

By following the components again A Of beforeRouteEnter Hook function to determine from.name Is it null, To operate whether to automatically go to the home page logic . The relevant code is as follows :

beforeRouteEnter(to, from, next) {
console.log("to--->",to);
console.log("from--->",from);
if(ctool.strIsEmpty(from.name)){
next();
}else{
next(vm => vm.initViews());
}
},

here initViews In is the cycle menu to find the home page and jump to the home page logic . Through the above processing , The perfect solution to the problem .

summary

(1) Whether in the browser or through this.$router.push When you jump to a page , Routing starts with components , Finally, locate the specific sub components , And in the corresponding router-view Medium rendering , In especial router-view nesting router-view When you see it more clearly , Child components are always rendered at the end of the parent component's life cycle . namely : If there is a refresh , The page is not left on the current page , That must be something wrong with the code logic .

(2) F5 The refresh operation will clear store Data in , So under normal circumstances , We can monitor the browser's refresh Events , In the heel component store Data passing localstorage Save and restore .

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本文为[Herbal tea ice]所创,转载请带上原文链接,感谢

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