I am using vue components in a Laravel project.
I have taken sample code from https://vuejs.org/guide/components/events.html#usage-with-v-model
I have a child component with an input box:
<script>
export default {
props: ['modelValue'],
emits: ['update:modelValue']
}
</script>
<template>
<input
:value="modelValue"
#input="$emit('update:modelValue', $event.target.value)"
/>
</template>
This component is being used in a parent component.
<phone-input v-model="phone"/> {{phone}}
The parent component displays the input box with the initial value of the phone variable. However, the changed value is not reflected in the parent's phone variable ( {{phone}} does not update). Am I missing something? I have cleared the cache, but it did not help.
I tried another variation of the code (from vue.js documentation code) as given here. However, this also does not work.
Parent
<MyComponent v-model:title="bookTitle" />. {{bookTitle}}
<!-- Child Component MyComponent.vue -->
<script>
export default {
props: ['title'],
emits: ['update:title']
}
</script>
<template>
<input
type="text"
:value="title"
#input="$emit('update:title', $event.target.value)"
/>
</template>
Thanks for your help.
Take a look at following snippet, looks ok:
const app = Vue.createApp({
data() {
return {
phone: "0123456"
}
},
})
app.component('phoneInput', {
template: `
<input
:value="modelValue"
#input="$emit('update:modelValue', $event.target.value)"
/>
`,
props: ['modelValue'],
emits: ['update:modelValue'],
})
app.mount("#demo")
<script src="https://unpkg.com/vue#3/dist/vue.global.prod.js"></script>
<div id="demo">
<phone-input v-model="phone"></phone-input>
{{ phone }}
</div>
<script>
export default {
props: ['modelValue'],
}
</script>
<template>
<input
:value="modelValue"
#input="$emit('input', $event.target.value)"
/>
</template>
You need specially emit input to make it work
Related
I am trying to use a custom Vue input component with a v-model, but the value is not updating in the parent component. I am using Vue 3 with Nuxt.js.
Here is my custom input component:
<template>
<input
type="text"
:value="modelValue"
#input="$emit('update:modelValue', $event.target.value)"
:placeholder="placeholder"
class="border border-gray-300 rounded-lg w-full p-2 text-black m-1"
/>
</template>
<script setup>
const props = defineProps({
modelValue: String,
placeholder: String,
});
const emit = defineEmits(["update:modelValue"]);
</script>
<script>
export default {
name: "MyInput",
};
</script>
And here is how I am using it in the parent component:
<template>
<div>
<MyInput v-model="inputValue" placeholder="Enter a value" />
</div>
</template>
<script>
import MyInput from "./MyInput.vue";
export default {
name: "MyParentComponent",
components: {
MyInput,
},
data() {
return {
inputValue: "",
};
},
};
</script>
The inputValue data property is not being updated when I type in the input field. Can someone help me figure out what I'm doing wrong?
I have a Vue 3 project without Nuxt.js using this exact same code and it works there.
there is no mistake in your codes I used exact same code and it's working with no problem
but:
there is no need to import components (Nuxt supports auto import)
your file's structure should be like this:
|__components
|
|__MyInput.vue
|
|__MyParentComponent.vue
|__app.vue
MyInput.vue
<template>
<input
type="text"
:value="modelValue"
#input="$emit('update:modelValue', $event.target.value)"
:placeholder="placeholder"
class="border border-gray-300 rounded-lg w-full p-2 text-black m-1"
/>
</template>
<script setup>
const props = defineProps({
modelValue: String,
placeholder: String,
});
const emit = defineEmits(["update:modelValue"]);
</script>
the dev tools will show the name of the component. So no additional naming is necessary.
MyComponent.vue
<template>
<div>
<MyInput v-model="inputValue" placeholder="Enter a value" />
<p>{{ inputValue }}</p>
</div>
</template>
<script setup>
let inputValue = ref("");
</script>
app.vue
<template>
<MyComponent />
</template>
I want to embed a checkbox inside a Vue3 Component and have the v-model binding passed down to the checkbox.
Inside the Component:
<!-- Tile.vue -->
<template>
<div>
<input type=checkbox v-model="$attrs">
</div>
</template>
<script>
export default {inheritAttrs: false}
</script>
Then in an outside file:
<template>
<Tile value="carrot" v-model="foods" />
<Tile value="tomatoes" v-model="foods" />
</template>
<script setup>
var foods = ref([]);
</script>
How do I achieve this?
The documentation says that v-model is just a shorthand for :modelValue and #update:modelValue but this is not universal as Vue obviously behaves differently for form elements such as smartly listening to onchange instead of oninput and modifying the property checked instead of value depending on the node.
If I use v-model on the outer component, how do I forward it to the checkbox and get the same smart behavior that Vue has?
I have found tons of controversial information. Some recommend using #input event (Vue 3 custom checkbox component with v-model and array of items). Some recommend emitting modelValue:update instead of update:modelValue (https://github.com/vuejs/core/issues/2667#issuecomment-732886315). Etc.. Following worked for me after hour of trial and error on latest Vuejs3
Child
<template>
<div class="form-check noselect">
<input class="form-check-input" type="checkbox" :id="id" :checked="modelValue" #change="$emit('update:modelValue', $event.target.checked)" />
<label class="form-check-label" :for="id"><slot /></label>
</div>
</template>
<script>
import { v4 as uuidv4 } from "uuid";
export default {
inheritAttrs: false,
emits: ["update:modelValue"],
props: {
modelValue: {
type: Boolean,
required: true,
},
},
setup() {
return {
id: uuidv4(),
};
},
};
</script>
Parent:
<Checkbox v-model="someVariable">Is true?</Checkbox>
you can verify that it works but doing this in parent:
var someVariable= ref(false);
watch(someVariable, () => {
console.log(someVariable.value);
});
p.s. The other solution above does not work for me. Author recommends using value property. But in example he passes v-model attribute. So I don't know exactly how it's supposed to work.
You can achieve the behavior by using emits to keep data in sync and behave as default v-model behavior. Checkbox component:
<template>
<div>
<input
type="checkbox"
:checked="value"
#change="$emit('input', $event.target.checked)"
/>
{{ text }}
</div>
</template>
<script>
export default {
name: "inputcheckbox",
props: ["value", "text"],
};
</script>
And in the parent component you can have as many checkboxes you want.
<template>
<div id="app">
<maincontent :showContent="showContent" />
<inputcheckbox text="one" v-model="checkedOne" />
<inputcheckbox text="two" v-model="checkedTwo" />
</div>
</template>
Here is a vue 2 example but is applicable to vue 3 as well. Hope this was helpful. Sandbox with this behavior:
https://codesandbox.io/embed/confident-buck-kith5?fontsize=14&hidenavigation=1&theme=dark
please help me understand what I'm doing wrong here:
I have a child component that receives a prop from its parent. I want to extract part the first character of that prop value inside the child component, but I'm getting an "undefined" error. Here's the code:
Parent Component:
Child Component:
<template>
<div class="form-group">
<label>{{ label }}</label>
<div class="form-check form-check-inline">
<input
class="form-check-input"
type="text"
id="inputAgno"
v-model="aaaa"
/>
</div>
</div>
</template>
<script>
export default {
props: ["label", "value"],
computed:{
aaaa: function() {
return this.alta_establecimiento.subStr(0,4)
},
}
};
</script>
Thanks in advance!
I'm trying to figure out how to pass a Vue prop to the a tag located in the second component. It can be any prop so I can't specifically import that one to the component.
First component
<script>
export default {
name: 'first',
}
</script>
<template>
<div class="first">
<slot />
</div>
</template>
Second component
<script>
export default {
name: 'second',
text: {
type: String,
required: true,
},
};
</script>
<template>
<li>
</li>
</template>
When I use the component I want to add a prop that gets attached to the a tag.
<first>
<second text="test" />
</first>
Look at v-bind="$attrs" in https://v2.vuejs.org/v2/guide/components-props.html#Disabling-Attribute-Inheritance.
V-bind actually can bind an entire key-value object.
my child component is like this
<editor v-model="edit_thread.body"></editor>
and then I access the component from inside like this
<template>
<div>
<input :value="this.value">
</div>
</template>
<script>
export default {
data() {
return {
value: this.edit_thread.body
}
}
}
</script>
not working, I miss something?
To use v-model on custom components, the component needs to:
have a prop (not a data property) named value:
<template>
<div>
<input :value="value">
</div>
</template>
<script>
export default {
props: ['value']
}
</script>
and emit an input event with new values:
<template>
<div>
<input #input="$emit('input', $event.target.value)">
</div>
</template>
demo