Passing Props
In VueJS if you set inheritAttrs to false and use v-bind="$attrs" you pass all props not declarated in a component to its child. Is there a similar way to pass all events coming from child to its parent in VueJS?
Code Example
Wrapper
<template>
<child-component v-bind="$attrs" />
</template>
<script>
module.exports = {
inheritAttrs: false
...
}
</script>
Child
<template>
...
</template>
<script>
module.exports = {
...
props: {
prop1: Boolean,
prop2: Boolean
}
...
}
</script>
Parent
<template>
<wrapper :prop1="false" :prop2="true" />
...
</template>
To pass all events use
v-on="$listeners"
For Vue 3.x:
v-bind="$attrs"
see listeners removed
(thanks to AverageHelper)
Related
In Vue2, the v-model bind to the prop value, but it's possible to define a other prop :
Vue.component('base-checkbox', {
model: {
prop: 'checked',
event: 'change'
},
props: {
checked: Boolean
},
template: `
<input
type="checkbox"
v-bind:checked="checked"
v-on:change="$emit('change', $event.target.checked)"
>
`
})
I want do the same in Vue 3 with API Composition.
How do you define a custom prop to v-model in Vue 3 with the API Composition?
Example :
<script setup lang="ts">
defineProps({
msg: {
type: String,
}
});
defineEmits(['update:msg'])
defineModel('msg', 'update:msg');
</script>
<template>
<div>
{{ msg }}
</div>
<button #click="$emit('update:msg', 'Clicked!')">Switch</button>
</template>
Of course defineModel don't exist, but I must not be far from the truth.
In Vue 3 the model option are removed and replaced with an argument on v-model
So if you want to change the v-model prop you can by changing the defineProps and defineEmits to use another name than modelValue.
However you cannot implicitly use v-model without adding the new custom prop name after the v-model.
You have to specify it like this : v-model:myCustomPropName.
<template>
<input :value="myCustomPropName" #input="$emit('update:myCustomPropName', $event.target.value)" />
</template>
<script setup>
import { defineProps, defineEmits } from "vue";
defineProps(["myCustomPropName"]);
defineEmits(["update:myCustomPropName"]);
</script>
Usage:
<MyCustomInput v-model:myCustomPropName="msg" />
Vue 3 props Doc : https://vuejs.org/guide/components/v-model.html
See the changes from Vue 2 to Vue 3 : https://v3-migration.vuejs.org/breaking-changes/v-model.html
I want to use v-model using props in v-for. I used v-model with props before using computed variables, but don't know how to do in v-for.
This is my code:
<script setup>
const fieldValue = computed({
get() {
return props.modelValue;
},
set(value) {
emits('update:modelValue', value);
},
});
</script>
<template>
<Mentionable
v-for="(field, index) in props.data.placeholder"
:key="index"
:keys="['#']"
:items="props.data.items"
>
<textarea
v-model="fieldValue"
:disabled="!props.data.loaded"
:placeholder="field.placeholder"
:maxlength="props.maxLength"
:required="props.required"
/>
</Mentionable>
</template>
Note: Mentionable is the component from vue-mention library.
Use model-value and update:model-value event instend of v-model.
If the component does not provide model-value and update:model-value event, there must be prop and event you can do the same.
A example, AInput from Ant Design Vue provides value prop and change event.
<script setup name="Demo">
const {ref} from 'vue'
const arrayInputs = ref(['1', 'test', '3'])
function change(i, event) {
arrayInputs.value[i] = event.target.value
}
</script>
<template>
<div class="vue-component">
<h2>ant-design-vue</h2>
<template v-for="(item, index) in arrayInputs" :key="index">
<!-- the index is important -->
<AInput :value="item" #change="event => change(index, event)" />
</template>
<div>{{ arrayInputs }}</div>
</div>
</template>
While using Bootstrap-Vue as UI framework, I am trying to make a custom form component and use it in several parent components. Here is my form component
<template>
<b-form>
<b-input-group>
<b-form-input placeholder="Post Title"></b-form-input>
<wysiwyg-input placeholder="Post Content" />
</b-input-group>
</b-form>
</template>
and the parent component is
<FormFields :title="title" :content="content" />
How can i access the value in parent component from child component.
Note: I am using vue-quill editor as well.
Here is the codesandbox link:
https://codesandbox.io/s/mystifying-benz-w8wgu?file=/src/App.vue
Thanks in advance !
Define a prop on your child component and pass the data to it when you use it in the parent:
// ChildComponent.vue
export default {
props: {
someData: {}
}
}
// ParentComponent.vue
<template>
<child-component :some-data="myData"></child-component>
</template>
<script>
export default {
data() {
return {
myData: {...}
}
}
}
</script>
I have two component namely App.vue and hello.vue
In App component I import the hello component and use props to pass relevant data to the hello component.
there I bind data which are took from the App component.
In my hello component I have a input box bind to the passed value.
My final goal is pass values as props to the hello component and change it and finally
pass that edited values to the backend using the save method.
How do I achive this?
This is what I have done up to now.
App.vue
<template>
<div id="app">
<hello-world :msg="'hello good morning'"></hello-world>
</div>
</template>
<script>
import helloWorld from "./components/HelloWorld";
export default {
components: {
helloWorld
}
};
</script>
hello.vue
<template>
<div>
<input type="text" :value="msg">
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
msg: String
}
};
</script>
In my hello component's input field v-model is not possible. I want something similar to the v-model.
You cannot use prop to bind to v-model. Child component is not supposed to modify prop passed by the parent component.
You will have to create a copy of prop in your child component if you wish to use prop with v-model and then watch prop like this:
<template>
<div>
<input type="text" #input="onInput" v-model="msgCopy">
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
msg: String
},
data() {
return { msgCopy: '' };
},
methods: {
onInput(newInputValue) {
this.$emit('msgChange', newInputValue);
}
}
watch: {
msg(newVal) {
this.msgCopy = newVal;
}
}
};
</script>
Also, notice the use of event handler #input to pass changed prop back to the parent component via event. As a syntax sugar, you can make your Hello component work as a custom form input control by adopting to v-model lifecycle.
How to pass all props dynamically to child component? As an example consider a case:
// wrapper around a component my-wrapper.vue
<template>
<div>
<third-party-component />
</div>
</template>
third-party-component is a component which can accept number of attributes like value, disabled, clicked, etc. How I can use my-wrapper in way that whatever I passed as props to it it will be transferred to third-party-component like
<my-wrapper :value="myVal" :disabled="field.isDisabled" />
By default the attributes you add on to my-wrapper will be bound to the root element which is div. To avoid this set inheritAttrs option to false
Then you can bind all the attributes to using v-bind="$attrs" where $attrs contains parent-scope attribute bindings (except for class and style)
// wrapper around a component my-wrapper.vue
<template>
<div>
<third-party-component v-bind="$attrs"/>
</div>
</template>
<script>
export default{
inheritAttrs: false
}
</script>
I would set identical props to the wappers and use them in the template ...
But there is many ways, it easy to speak from parent to childs.
https://en.vuejs.org/v2/guide/components-props.html#Passing-Static-or-Dynamic-Props
https://v1.vuejs.org/guide/syntax.html#Shorthands
---- MyWrapper.vue
<template>
<div>
<third-party-component :value="value" :disabled="disabled" />
</div>
</template>
<script>
#import third-party-component from '../..? ./components/thirdPartyComponent.vue'
export default {
name: 'MyWrapper',
props: ['value', 'disabled'],
components: {
third-party-component // local component, you can use global
}
//... data, computed ...
}
</script>
----- MyAppli.vue
<template>
<my-wrapper :value="myVal" :disabled="field.isDisabled" />
</template>
<script>
import my-wrapper from '../..? ../components/MyWrapper.vue'
export default {
name: 'MyApp',
components: {
my-wrapper // local component, you can use global
} ....