Sometimes, we want to force Vue.js to reload or re-render.
In this article, we’ll look at how to force Vue.js to reload or re-render.
To force Vue.js to reload or re-render, we can use the this.$forceUpdate method.
For instance, we write
this.$forceUpdate();
to call this.$forceUpdate() in our component to force an update.
To force Vue.js to reload or re-render, we can use the this.$forceUpdate method.
Sometimes, we want to persist Vuex state on page refresh.
In this article, we’ll look at how to persist Vuex state on page refresh.
To persist Vuex state on page refresh, we can use the vuex-persistedstate package.
To install it, we run
npm i vuex-persistedstate
Then we use it by writing
import { Store } from "vuex";
import createPersistedState from "vuex-persistedstate";
import * as Cookies from "js-cookie";
const store = new Store({
// ...
plugins: [
createPersistedState({
getState: (key) => Cookies.getJSON(key),
setState: (key, state) =>
Cookies.set(key, state, { expires: 3, secure: true }),
}),
],
});
to call createPersistedState to return the plugin that we add to the plugins array.
We call it with an object with methods to get and set data with getState and setState respectively.
We get and set cookies when state is changed with Cookies.getJSON and Cookies.set.
To persist Vuex state on page refresh, we can use the vuex-persistedstate package.
Sometimes, we want to emit event from grandchild to his grandparent component with Vue.js
In this article, we’ll look at how to emit event from grandchild to his grandparent component with Vue.js.
To emit event from grandchild to his grandparent component with Vue.js, we call $emit in the grand child component.
Then in the parent component, we pass the events from the child to the grandparent with v-on="$listeners.
And then we listen to the event emitted from the grandchild component in the grandparent.
For instance, we write
Vue.component("grand-child", {
//...
methods: {
emitToggleEvent() {
this.$emit("toggle-value");
},
},
});
to call this.$emit in the grand-child component to emit the toggle-value event.
Then in the parent component of the grand-child, we write
Vue.component("child", {
template: `<div class="child">
<grand-child v-on="$listeners"></grand-child>
</div>`,
});
to pass all events to the child‘s parent with v-on="$listeners".
Finally, in the parent component, which is the parent of the child component, we listen to the toggle-value event with
Vue.component("parent", {
template: `div>
<child @toggle-value="toggleValue"></child>
</div>`,
//...
});
To emit event from grandchild to his grandparent component with Vue.js, we call $emit in the grand child component.
Then in the parent component, we pass the events from the child to the grandparent with v-on="$listeners.
And then we listen to the event emitted from the grandchild component in the grandparent.
Sometimes, we want to fix Vue Router return 404 when revisit to the URL.
In this article, we’ll look at how to fix Vue Router return 404 when revisit to the URL.
To fix Vue Router return 404 when revisit to the URL, we should make sure we redirect all URLs to index.html.
For instance, if we host our Vue app in Apache, we can add the following into the .htaccess file.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.html$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.html [L]
</ifModule>
We match all URLs with
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
And then we redirect all the URLs to index.html with
RewriteRule . /index.html [L]
To fix Vue Router return 404 when revisit to the URL, we should make sure we redirect all URLs to index.html.
For instance, if we host our Vue app in Apache, we can add the following into the .htaccess file.
Sometimes, we want to update an array with Vue.js and Vue.set()
In this article, we’ll look at how to update an array with Vue.js and Vue.set().
To update an array with Vue.js and Vue.set(), we call Vue.set or this.$set with the array we want to update, the index of the array item we want to update, and the item we replace the existing item at the index with.
For instance, we write
new Vue({
el: "#app",
data: {
items: ["10-03-2017", "12-03-2017"],
},
methods: {
update() {
this.$set(items, 1, "12-03-2022");
},
},
});
to call this.$set with the items array, index 1, and "12-03-2022" to update the 2nd items entry to "12-03-2022".
This change will be picked up by Vue, so re-rendering will happen.
We use Vue.set the same as this.$set.
To update an array with Vue.js and Vue.set(), we call Vue.set or this.$set with the array we want to update, the index of the array item we want to update, and the item we replace the existing item at the index with.