vuetify: programmatically showing dialog - vue.js

Question

vuetify says: If you want to programmatically open or close the dialog, you can do so by using v-model with a boolean value.
However I am quite unclear on what this means. Saying "using v-model" is vague at best. The parent component knows on setup if it should open but I am unclear on how to dynamically change this in the child. Am i supposed to pass it using v-bind?
<login v-bind:showDialog></login>
If so how does the child component deal with this?
Vuetify Dialog info here: https://vuetifyjs.com/components/dialogs

Answer 1

As I understand you have a child component which have a dialog within it. Not sure that this is 100% right, but this is how I implement it. Child component with dialog:
<template>
<v-dialog v-model="intDialogVisible">
...
</template>
<script>
...
export default {
props: {
dialogVisible: Boolean,
...
},
computed: {
intDialogVisible: {
get: function () {
if (this.dialogVisible) {
// Some dialog initialization code could be placed here
// because it is called only when this.dialogVisible changes
}
return this.dialogVisible
},
set: function (value) {
if (!value) {
this.$emit('close', some_payload)
}
}
}
in parent component we use it:
<my-dilaog :dialogVisible="myDialogVisible"
#close="myDialogClose">
</my-dialog>
data () {
return {
myDialogVisible: false
}
},
methods: {
myDialogClose () {
this.myDialogVisible = false
// other code
}
}

Answer 2

Дмитрий Алферьев answer's is correct but get "Avoid mutating a prop directly" warning, because when close dialog, v-dialog try change v-model to false, while we passed props to v-model and props value won't change. to prevent the warning we should use :value , #input
<template>
<v-dialog :value="dialog" #input="$emit('update:dialog',false)" #keydown.esc="closeDialog()" >
...
</v-dialog>
</template>
<script>
export default {
props: {
dialog: Boolean
},
methods: {
closeDialog(){
this.$emit('closeDialog');
}
}
In parent
<template>
<v-btn color="primary" #click="showDialog=true"></v-btn>
<keep-alive>
<my-dialog
:dialog.sync="showEdit"
#closeDialog="closeDialog"
>
</my-dialog>
</keep-alive>
</template>
<script>
data(){
return {
showEdit:false,
},
},
methods: {
closeDialog(){
this.showEdit = false;
},
}

Answer 3

v-model is a directive. You would use v-model, not v-bind.
The page you link has several examples. If you click on the <> button on the first one, it shows HTML source of
<v-dialog v-model="dialog">
v-model makes a two-way binding on a prop that is named value inside the component. When you set the bound variable's value to true, the dialog will display; when false, it will hide. Also, if the dialog is dismissed, it will set the variable's value to false.