reactivity | Unofficially Official Reactivity API | Reactive Programming library
kandi X-RAY | reactivity Summary
kandi X-RAY | reactivity Summary
In a very basic sense, Reactivity hast two parts:. We say that a function is reactive if it can notify us when its value has changed. ( somebody was kind enough to create a reactivity.notifier() under the covers ).
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of reactivity
reactivity Key Features
reactivity Examples and Code Snippets
Community Discussions
Trending Discussions on reactivity
QUESTION
I'm a Vue developer that's trying to do a React App.
I'm trying to wrap CodeMirror in a React app and I'm running into some troubles. Not sure how to fix it.
I'm instantiating a CodeMirror editor and attaching some event handlers to it.
Those handlers are like so:
When you focus the editor, the isFocused variable becomes true.
When you focus out of the editor, the isFocused variable becomes false.
When you type in the editor you should do some action if the isFocused variable is true.
In the last handler, I need to access a reactive variable set with useState (isFocused).
That variable is not reactive in the context of that function. It's read as the default value false.
The component looks something like this:
...ANSWER
Answered 2021-Jun-14 at 12:57Add a useEffect function with a callback to handleChange and pass it isFocused as an argument.
PS: Don't forget Boolean() to display the state of isFocused otherwise it returns an object.
(See the demo link at the bottom of the page )
QUESTION
When I run test, it show TypeError: Cannot destructure property 'travelDatas' of '(0 , _GetTravelDatas.getTravelDatas)(...)' as it is undefined.
As you see the screenshot: unit test
There isn't any console error or warning.
Could anyone help please
travelListTest.spec.js
...ANSWER
Answered 2021-Jun-13 at 09:10You are mocking the GetTravelDatas module with an auto-mock version by calling:
QUESTION
I want to build a todo app with ionic-vue. It currently uses vue 3. I have this overview (called Lists.vue) where it is possible to click on multiple lists (where tasks should be loaded per list). However, everytime when I click on a list, the same data appears! It is as if the component is being reused but not re rendered/ updated.
I have tried all kinds of solutions. One of them was to apply a watch on the ref that is being changed, however, it does not matter, the end result stays the same. Also tried to give :key to router-link, still does not work.
My Lists.vue
...ANSWER
Answered 2021-Jun-04 at 04:54Found the answer to my problem! I had to use watchEffect on the loadValue method in order to recall the data from the database. It would seem that Vue (after some research on the internet) wants to reuse components instead of rerendering them, which is more efficient.
The route params were being updated but the key of the component was not, however.
The setup function on Index.vue (the list of tasks)
QUESTION
I seem to break the reactivity of my objects, and the v-if's don't work. My array is an array of Parse Objects, which require me to use .get() to get the values, which is working on initial load on title, description, etc. After I loaded the data, I check everything and update some values with the .set(), but they don't update the view until I hard refresh the whole Nativescript view, which is of course not a proper solution.
Nativescript
...ANSWER
Answered 2021-May-31 at 13:58If found the answer. The object was updating with the vue method this.$set(this.challenges, index, item), but the listview was not showing the correct height after. So all the new objects were hidden rows.
QUESTION
I just noticed an unexpected behaviour and now I don't know if it is normal or not.
I have a component named follows and a child component named follow-list-modal
I'm passing a followList (pagination ) from follows to its child component follow-list-modal
In the follow-list-modal I store the paginated array in the variable members
ANSWER
Answered 2021-May-31 at 13:13You instantiate your data with a direct link to the (initially undefined) property of your prop. This property is a complex entity like an Object (Arrays are Objects), and is thus called via reference. Since members references the same thing in memory as followList.data, when you're calling members, it will follow the reference to the same entity as followList.data. This doesn't have to do with Vue2 reactivity, but here's a link nontheless.
pushmutates the array it is called on; it will follow the reference throughmembersand changefollowList.data, updating its value when called through followList as well. Because thedatakey is not present on instantiation of the component, Vue can't watch it (just like you need to use Vue.set when adding a new key to a data object).concatreturns a new array of merged elements, and then replaces the reference inmemberswith the new array. Therefore from this point on you'll no longer mutatefollowList.data, even with a push, as the reference has changed to a new entity.
When trying to set your initial members and dataset, I suggest using an initialization method that creates a clone of your followList and writes that to dataset, and running this on the created() or mounted() hook of your component lifecycle. Then create a computed property for members, no need to store followList.data thrice and potentially have dataset and members diverge.
QUESTION
Vue has the concept of Computed Properties. They only get re-evaluated when one of their dependency changes. An example:
...ANSWER
Answered 2021-May-29 at 09:50The obvious difference between computed properties and method results is that methods shouldn't necessary involve component instance exclusively, so they shouldn't cache results.
If a value is not parametrized, it can be extracted to a computed on per need basis:
QUESTION
I have migrated from Quasar v1 to Quasar v2, and in doing so have moved to Vue 3. I have the code below that worked in Quasar v1 (Vue v2), but now when running in Quasar v2 (Vue v3) I get the following error message in the console when selecting a filter:
...ANSWER
Answered 2021-May-28 at 22:32The migration guide for vue-router 4 doesn't say explicitly, but you can no longer ref the child component via the tag itself. There is a new paradigm mentioned for handling the child's slots that turns out to work for your use case as well; here's the adjusted code:
QUESTION
I have a multidimensional array called verses:
ANSWER
Answered 2021-May-26 at 16:08Not sure if you are passing the data value correctly, but I have changed that a bit and its working fine for me .
QUESTION
I wanted to make a validation on the match of passwords with the following error:
vue.runtime.esm.js?2b0e:619 [Vue warn]: Property or method "$v" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.
main.js
...ANSWER
Answered 2021-Jan-15 at 12:36Replace the below line
QUESTION
I have an issue with I don't understand:
simply I going to display some data from API its all works perfectly but I getting an error that personnel.departmentID is undefined, and my vue-debug tool not working.
I'm getting it only when I assign anything from departmentID while for the rest like firstName, lastName, etc.
The strange thing that data for departmentID.name etc. it's displaying properly but it throws the following error.
in my console I getting an error:
...ANSWER
Answered 2021-May-12 at 16:04You've to init the personnel property like :
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install reactivity
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
