I have child component which function is to upload a photo. Uploaded photo assigned to child component data named "photo".
I need to bind parent data named "file" with child data named "photo". And when "photo" is changed "file" should be changed too.
Child component:
<template>
<div class="select">
<img v-if="previewFile" :src="previewFile" alt="" />
<img v-else src="/images/empty.jpg" alt="" />
<label class="btn" for="image-upload">{{ btnLabel }}</label>
<input id="image-upload" type="file" ref="file" #change="uploadFile" />
</div>
</template>
import { mapGetters } from "vuex";
export default {
name: "SelectPhoto",
data() {
return {
file: null,
previewFile: null,
};
},
methods: {
uploadFile() {
this.file = this.$refs.file.files[0];
}
}
}
Parent component:
<template>
<SelectPhoto :btn-label="text.RU.photoSelect.choosePhoto" v-model:file.sync="file"/>
<BaseButton :label="text.RU.photoSelect.knowName" #do="$emit('getResult', file, previewFile)" />
</template>
<script>
export default {
data() {
return {
file: null,
};
},
};
</script>
You already used $emit on your BaseButton component. You could also use it for this.file. In your child component like this:
uploadFile() {
this.file = this.$refs.file.files[0];
this.$emit('sendMyFile', this.file)
}
In you parent component, to react to the action:
<SelectPhoto #sendMyFile="getMyFile" :btn-label="text.RU.photoSelect.choosePhoto" v-model:file.sync="file"/>
Also in the parent component do what you want with the the.file:
methods: {
getMyFile(file) {
// do something
}
}
Related
I want to show or hide the item by clicking the button or clicking the item itself, for example:
<template>
<div>
<button #click="show?show = false:show = true">
{{show?"Hide":"Show"}}
</button>
<div #click="show?show = false:show = true" v-if="show">
Vue Js - click here to Hide
</div>
</div>
</template>
<script>
export default {
data() {
return {
show: null,
};
}
};
</script>
but i want to import the item from another component, so i do this:
the parent component:
<template>
<div>
<button #click="show?show = false:show = true">
{{show?"Hide":"Show"}}
</button>
<item :show="show" />
</div>
</template>
<script>
import item from "item.vue"
export default {
components: {
item
},
data() {
return {
show: null,
};
}
};
</script>
the child component:
<template>
<div #click="show?show = false:show = true" v-if="show">
Vue Js - click here to Hide
</div>
</template>
<script>
export default {
props: {
show: Boolean,
}
};
</script>
but of course, it doesn't work well.
When i click on the item it disappears but the show value in the parent component doesn't change and I get an error saying Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "show".
so how to edit the data value of the parent component from the child component?
(I use Vue 2.6.14)
The solution is to use event emitting (Youtube Tutorial) to send updated data up to the parent component from the child component.
so the code becomes like this:
the parent component:
<template>
<div>
<button #click="show?show = false:show = true">
{{show?"Hide":"Show"}}
</button>
<item :show="show" #state="update($event)" />
</div>
</template>
<script>
import item from "item.vue"
export default {
components: {
item
},
data() {
return {
show: null,
};
},
methods: {
update(value) {
this.show = value;
}
}
};
</script>
the child component:
<template>
<div #click="action" v-if="show">
Vue Js - click here to Hide
</div>
</template>
<script>
export default {
props: {
show: Boolean,
},
methods: {
state() {
if (this.show) {
return false;
} else {
return true;
}
},
action() {
this.$emit("state", this.state())
}
}
};
</script>
Thank you #D.Schaller for helping
I have three components component-1, component-2, and an App component, I pass a Boolean props from component-1 to component-2 then using #click event I change the props value from true to false and vice versa
App.vue
<template>
<div id="app">
<img alt="Vue logo" src="./assets/logo.png" width="20%" />
<component1 />
</div>
</template>
component-1.vue
<template>
<div>
<component2 :have-banner="true" />
</div>
</template>
<script>
import component2 from "./component-2";
export default {
components: {
component2,
},
};
</script>
component-2.vue
<template>
<div>
<button #click="AssignBanner = !AssignBanner">Click me</button>
<p>{{ AssignBanner }}</p>
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
haveBanner: Boolean,
},
data() {
return {
AssignBanner: this.haveBanner,
};
},
};
</script>
I want to get the value of the props in component-1, that is, I want to track the changing value in component-1, since I want to write some logic, but I can’t keep track of the value in component-1.
You can see the given code in codesandbox
Looks like you want to achieve two-way binding for the prop haveBanner. You can achieve this with the .sync modifier if you are using Vue 2.3+.
component-1.vue
<template>
<div>
<component2 :have-banner.sync="haveBanner" />
</div>
</template>
<script>
import component2 from "./component-2";
export default {
components: {
component2,
},
data() {
return {
haveBanner: true,
}
},
};
</script>
component-2.vue
<template>
<div>
<button #click="assignBanner = !assignBanner">Click me</button>
<p>{{ assignBanner }}</p>
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
haveBanner: Boolean,
},
data() {
return {
assignBanner: this.haveBanner,
};
},
watch: {
assignBanner(value) {
// propagate to parent component
this.$emit('update:haveBanner', value)
},
},
};
</script>
I have a few forms. Every of them have the same logic (validation, sending...) so, I want to create one method to control actions on my forms. For now my code is redundancy, because I have the same methods onSubmit() on every .vue file.
my HTML:
<div id="app">
<myform-one></myform-one>
<myform-two></myform-two>
</div>
my JavaScript (main.js - entry file in webpack):
import Vue from 'vue';
import Myform1 from './myform1.vue';
import Myform2 from './myform2.vue';
new Vue({
el: '#app',
components: {
myformOne: Myform1,
myformTwo: Myform2
}
});
and VUE components files:
myform1.vue:
<template>
<div>
<form #submit.prevent="onSubmit">
<input type="text" v-model="fields.fname11" />
<input type="text" v-model="fields.fname12" />
<button type="submit">submit</button>
</form>
</div>
</template>
<script>
let formfields = {
fname11: '',
fname12: ''
};
export default {
data() {
return {
fields: formfields
}
},
methods: {
onSubmit() {
// code responsible for reading, validating and sending data here
// ...
console.log(this.fields);
}
},
}
</script>
and myform2.vue:
<template>
<div>
<form #submit.prevent="onSubmit">
<input type="text" v-model="fields.fname21" />
<input type="text" v-model="fields.fname22" />
<input type="text" v-model="fields.fname23" />
<button type="submit">submit</button>
</form>
</div>
</template>
<script>
let formfields = {
fname21: '',
fname22: '',
fname23: '',
};
export default {
data() {
return {
fields: formfields
}
},
methods: {
onSubmit() {
// code responsible for reading, validating and sending data here
// ...
console.log(this.fields);
}
},
}
</script>
How can I create and use one, common method submitForm()? And where its code should be (good practice)?
Create a separate file which contains the logic:
// submitForm.js
export default function (fields) {
// code responsible for reading, validating and sending data here
// ...
}
Then use that logic inside the components
import submitForm from "../services/submitForm.js"
...
methods: {
onSubmit() {
submitForm(this.fields)
}
}
Vue3 (with Quasar for me but I'm sure it would work for any framework):
Say you have a parent which contains a number of forms <Forms />:
First create a composable function like so useForms.js:
import { ref } from 'vue'
const forms = ref([])
export function useForms(){
const checkForms = () => {
forms.value.forEach((form) => form.validate()
}
const addFormToFormsArray = (form) => {
forms.value.push(form)
}
return { forms, addFormToFormsArray, checkForms }
}
Then import it into <Forms />:
<template>
<Form />
<Form />
<Form />
<button #click="checkForms">Check Form</button>
</template>
<script setup>
import { useForms } from '../useForms';
const { checkForms } = useForms()
</script>
Finally, inside the <Form />:
<template>
<form ref="form">
.../stuff
</form>
</template>
<script setup>
import { ref, onMounted } from 'vue'
import { useForms } from '../useForms';
const form = ref(null)
onMounted(() => {
addFormToFormsArray(form.value)
})
const { checkForms, addFormToFormsArray } = useForms()
</script>
When performing the check function in the parent, it should go through each form and check for any issues.
There are some options. My favorite is creating a mixin vue docs mixins
export const form_functionality = {
methods: {
on_submit() {
//logic of submit
},
//here we can have other reusable methods
}
}
Then in your components use that mixin as follow:
import { form_functionality } from 'path_of_mixin'
export default {
mixins: [form_functionality]
}
In the end, what mixins has (created, methods, data etc) will be merged to the component
which uses that mixin.
So, practically you can access the mixin method like this.on_submit()
I have component 'Page' that should display a component which is retrieved via its props.
I managed to get my component loads when I harcode my component path in my component data like this :
<template>
<div>
<div v-if="includeHeader">
<header>
<fv-header/>
</header>
</div>
<component :is="this.componentDisplayed" />
<div v-if="includeFooter">
<footer>
<fv-complete-footer/>
</footer>
</div>
</div>
</template>
<script>
import Header from '#/components/Header/Header';
import CompleteFooter from '#/components/CompleteFooter/CompleteFooter';
export default {
name: 'Page',
props: {
componentPath: String,
includeHeader: Boolean,
includeFooter: Boolean
},
data() {
componentDisplayed: function () {
const path = '#/components/my_component';
return import(path);
},
},
components: {
'fv-header': Header,
'fv-complete-footer': CompleteFooter,
},
}
</script>
But with the data I cannot refer to my props within my function as this is undefined.
I tried to used computed properties instead of data but I have the error "src lazy?0309:5 Uncaught (in promise) Error: Cannot find module '#/components/my_component'. But the module exists! But maybe not at that time ?
computed: {
componentDisplayed: function () {
const path = `#/components/${this.componentPath}`;
return import(path);
},
},
There must be away to deal with that but I am quite a beginner to vue.js :)
Instead of trying to import the component in your child component, instead import it in the parent component and pass the entire component as a prop.
<template>
<div :is="component" />
</template>
<script>
export default {
name: "page",
props: {
component: {
required: true
}
}
};
</script>
And in the parent
<page :component="component" />
and
import Page from './components/Page';
// and further down
data () {
return {
component: HelloWorld
}
}
I have a simple component:
<template>
<div id="search__index_search-form">
<input :foo-id="fooId" #keyup.enter="findFoos()" type="text" :value="keyword" #input="updateKeyword"
placeholder="Search for a foo">
<button #click="findFoos()">Search!</button>
{{fooId}}
</div>
</template>
<script>
import {mapState} from "vuex";
export default {
computed: mapState({
keyword: state => state.search.keyword
}),
data: function () {
return {fooId: "all"};
},
methods: {
updateKeyword(e) {
this.$store.commit("setSearchKeyword", e.target.value);
},
findFoos() {
this.$store.dispatch("findFoos");
}
}
};
</script>
I am calling it from nuxt page:
<template>
<searchbar v-bind:fooId="500"/>
</template>
<script>
import searchBar from "~/components/search-bar.vue";
export default {
components: {
'searchbar': searchBar
}
};
</script>
This results in:
<div id="search__index_search-form" fooid="500"><input shop-id="all" type="text" placeholder="Search for a foo"><button>Search!</button>
all
</div>
Question is, why is fooId bound to "div.search__index_search-form" and not to input? And how come {{fooId}} results in "all" (default state), and not "500"?
fooId is rendered on div#search__index_search-form because you do not declare fooId as a property of the component. Vue's default behavior is to render undeclared properties on the root element of the component.
You need to declare fooId as a property.
export default {
props: {
fooId: {type: String, default: "all"}
},
computed: mapState({
keyword: state => state.search.keyword
}),
methods: {
updateKeyword(e) {
this.$store.commit("setSearchKeyword", e.target.value);
},
findProducts() {
this.$store.dispatch("findFoos");
}
}
};
I'm not sure what you are really trying to accomplish though.
<input :foo-id="fooId" ... >
That bit of code doesn't seem to make any sense.