In a vue component I want to generate dynamic input elements in a for loop and bind them to the data.form element.
data() {
return {
form: {}
}
}
<b-form-checkbox v-model="form[key]['amount']" type="checkbox" :value="key"></b-form-checkbox>
How can I deal with this, what I tried:
form.amount[key] // is working, but not really the best data structure, and the array is populated with null values for each for loop entry on init ...
form[key]['amount'] // not working
// the working example I mentioned is structured this way
form: {
amount: [],
}
Maybe someone can help me with this ...
Simply define an empty array for the form fields, e.g. return { formFields: [] }. Then add as many values in this array as input fields you want to render on the screen:
<template>
<form>
<input v-for="(field,index) in formFields" :key="index" v-model="fields[index]" type="text">
</form>
</template>
<script>
export default
{
data()
{
return {
formFields: []
};
},
mounted()
{
for (let i = 1; i <= 10; i++) this.formFields.push('');
}
}
</script>
If you need different types of input fields - you will need to use array of objests instead of strings, and encode the field type as a property inside each of these objects.
Related
I'm quite new to vue and right now I'm trying to figure out how to make changes to a computed array and make an element react to this change. When I click the div element (code section 4), I want the div's background color to change. Below is my failed code.
Code section 1: This is my computed array.
computed: {
arrayMake() {
let used = [];
for (let i = 0; i < 5; i++) {
used.push({index: i, check: true});
}
return used;
Code section 2: This is where I send it as a prop to another component.
<test-block v-for="(obj, index) in arrayMake" v-bind:obj="obj" v-on:act="act(obj)"></card-block>
Code section 3: This is a method in the same component as code section 1 and 2.
methods: {
act(obj){
obj.check = true;
}
Code section 4: Another component that uses the three sections above.
props: ["obj"],
template: /*html*/`
<div v-on:click="$emit('act')">
<div v-bind:style="{ backgroundColor: obj.check? 'red': 'blue' }">
</div>
</div>
Easiest way to achieve this, store the object into another data prop in the child component.
child component
data() => {
newObjectContainer: null
},
onMounted(){
this.newObjectContainer = this.obj
},
methods: {
act(){
// you don't need to take any param. because you are not using it.
newObjectContainer.check = !newObjectContainer.check
}
}
watch: {
obj(val){
// updated if there is any changes
newObjectContainer = val
}
}
And if you really want to update the parent component's computed data. then don't use the computed, use the reactive data prop.
child component:
this time you don't need watcher in the child. you directly emit the object from the method
methods: {
act(){
newObjectContainer.check = !newObjectContainer.check
this.emits("update:modelValue", nextObjectContainer)
}
}
parent component:
data() => {
yourDynamicData: [],
},
onMounted(){
this.yourDynamicData = setAnArray()
},
methods(){
setAnArray(){
let used = [];
for (let i = 0; i < 5; i++) {
used.push({index: i, check: true});
}
return used;
}
}
okay above you created a reactive data property. Now you need the update it if there is a change in the child component,
in the parent first you need object prop so, you can update that.
<test-block v-for="(obj, index) in arrayMake" v-model="updatedObject" :obj="obj"></card-block>
data() => {
yourDynamicData: [],
updatedObject: {}
},
watch:{
updatedObject(val){
const idx = val.index
yourDynamicData[idx] = val
}
}
I'm using v-for with Vue.js (v2.6.12) to display entries in an object e.g.
{
"12345": {
name: "foo",
isAccepted: true,
},
"56789": {
name: "bar",
isAccepted: false,
}
}
HTML:
<div v-for="item in sortMyItems(items)" v-bind:key="item.id">
<span>{{ item.name }}</span>
<span>{{ item.isAccepted }}</span>
</div>
Sort method in VM:
methods: {
sortMyItems: function(items) {
var accepted = [];
var rejected = [];
for (var id in items) {
var item = items[id];
if (item.isAccepted) {
accepted.push(item);
} else {
rejected.push(item);
}
}
return accepted.concat(rejected);
}
}
It's important to me to maintain the object structure of items in the model, which is why I'm doing it this way. The problem I have is that when the isAccepted property of any of the items in my data structure change, Vue re-renders the items that the sort order reflects the new ordering. I understand that this is a very useful feature of Vue, but in my case I really don't want this to happen. I want the sort order to be maintained the way it is after sortMyItems is first called. Is there a way to tell Vue to not monitor changes or just not re-render e.g. v-once
As far as I understood your question:
You could call sortMyItems(items) in the created Lifecycle Hook and store the result in a property of data.
Then, you can iterate over that property in your v-for:
export default {
data() {
return {
sortedData: [];
}
},
created() {
this.sortedData = sortMyItems(items)
}
}
I have few inputs with submit button. Have some validation logic that adds 'has-error' class to input. How can i unset this class on focus?
Template:
<div class="input-styled badge-icon" :class="{ 'has-error': errors.email}">
<input type="text" #focus="delete errors.email" v-model="email" placeholder="example#gmail.com">
</div>
<button #click="submit">Submit</button>
JS
data() {
return {
errors: {},
email: ''
}
},
methods: {
submit(){
this.errors = {};
if(!this.email){
this.errors.email = 'Something';
}
}
}
I'm trying delete error property, trying #focus='errors.email="" ', but class 'has-error' disappears only when i'm typing something on inputs. #focus event works and i think that i should call some function that will update my DOM?
It is a good practice to move operations on component's data to functions. You can achieve desired validation reset, by creating a resetValidation function and binding it to focus event on input field.
Method itself should reset errors field to falsy values. Example below assumes, there are multiple input fields in the form. Each field should call resetVlidation method with corresponding error field name. If no field is provided, we can reset validation as whole:
resetValidation (field) {
if (field) {
this.errors = {
...this.errors,
[field]: ''
}
} else {
this.errors = {}
}
Please, check the working example below:
codesandbox
How do I access $refs inside computed? It's always undefined the first time the computed property is run.
Going to answer my own question here, I couldn't find a satisfactory answer anywhere else. Sometimes you just need access to a dom element to make some calculations. Hopefully this is helpful to others.
I had to trick Vue to update the computed property once the component was mounted.
Vue.component('my-component', {
data(){
return {
isMounted: false
}
},
computed:{
property(){
if(!this.isMounted)
return;
// this.$refs is available
}
},
mounted(){
this.isMounted = true;
}
})
I think it is important to quote the Vue js guide:
$refs are only populated after the component has been rendered, and they are not reactive. It is only meant as an escape hatch for direct child manipulation - you should avoid accessing $refs from within templates or computed properties.
It is therefore not something you're supposed to do, although you can always hack your way around it.
If you need the $refs after an v-if you could use the updated() hook.
<div v-if="myProp"></div>
updated() {
if (!this.myProp) return;
/// this.$refs is available
},
I just came with this same problem and realized that this is the type of situation that computed properties will not work.
According to the current documentation (https://v2.vuejs.org/v2/guide/computed.html):
"[...]Instead of a computed property, we can define the same function as a method. For the end result, the two approaches are indeed exactly the same. However, the difference is that computed properties are cached based on their reactive dependencies. A computed property will only re-evaluate when some of its reactive dependencies have changed"
So, what (probably) happen in these situations is that finishing the mounted lifecycle of the component and setting the refs doesn't count as a reactive change on the dependencies of the computed property.
For example, in my case I have a button that need to be disabled when there is no selected row in my ref table.
So, this code will not work:
<button :disabled="!anySelected">Test</button>
computed: {
anySelected () {
if (!this.$refs.table) return false
return this.$refs.table.selected.length > 0
}
}
What you can do is replace the computed property to a method, and that should work properly:
<button :disabled="!anySelected()">Test</button>
methods: {
anySelected () {
if (!this.$refs.table) return false
return this.$refs.table.selected.length > 0
}
}
For others users like me that need just pass some data to prop, I used data instead of computed
Vue.component('my-component', {
data(){
return {
myProp: null
}
},
mounted(){
this.myProp= 'hello'
//$refs is available
// this.myProp is reactive, bind will work to property
}
})
Use property binding if you want. :disabled prop is reactive in this case
<button :disabled="$refs.email ? $refs.email.$v.$invalid : true">Login</button>
But to check two fields i found no other way as dummy method:
<button :disabled="$refs.password ? checkIsValid($refs.email.$v.$invalid, $refs.password.$v.$invalid) : true">
{{data.submitButton.value}}
</button>
methods: {
checkIsValid(email, password) {
return email || password;
}
}
I was in a similar situation and I fixed it with:
data: () => {
return {
foo: null,
}, // data
And then you watch the variable:
watch: {
foo: function() {
if(this.$refs)
this.myVideo = this.$refs.webcam.$el;
return null;
},
} // watch
Notice the if that evaluates the existence of this.$refs and when it changes you get your data.
What I did is to store the references into a data property. Then, I populate this data attribute in mounted event.
data() {
return {
childComps: [] // reference to child comps
}
},
methods: {
// method to populate the data array
getChildComponent() {
var listComps = [];
if (this.$refs && this.$refs.childComps) {
this.$refs.childComps.forEach(comp => {
listComps.push(comp);
});
}
return this.childComps = listComps;
}
},
mounted() {
// Populates only when it is mounted
this.getChildComponent();
},
computed: {
propBasedOnComps() {
var total = 0;
// reference not to $refs but to data childComps array
this.childComps.forEach(comp => {
total += comp.compPropOrMethod;
});
return total;
}
}
Another approach is to avoid $refs completely and just subscribe to events from the child component.
It requires an explicit setter in the child component, but it is reactive and not dependent on mount timing.
Parent component:
<script>
{
data() {
return {
childFoo: null,
}
}
}
</script>
<template>
<div>
<Child #foo="childFoo = $event" />
<!-- reacts to the child foo property -->
{{ childFoo }}
</div>
</template>
Child component:
{
data() {
const data = {
foo: null,
}
this.$emit('foo', data)
return data
},
emits: ['foo'],
methods: {
setFoo(foo) {
this.foo = foo
this.$emit('foo', foo)
}
}
}
<!-- template that calls setFoo e.g. on click -->
In VueJS 2 I am trying to create a component that gets and passes data back to the parent which then passes it to another component to display.
The component that gets the data has a user input field it uses to search. When I have it pass data back to the parent using $emit the value in the input keeps being wiped.
I am receiving the below mutation error but I haven't directly tried to change the userSearch field in the component so I am not sure why.
"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: "userSearch" (found in PersonField)"
Relevant html
<person-field v-on:event_child="eventChild"></person-field>
<person-search :prop="personListArray" ></person-search>
Parent app
var app = new Vue({
el: '#app',
data: {
personListArray : [],
tempArray: []
},
methods: {
eventChild: function (arr) {
this.personListArray = arr
}
}
})
Component 1, displays a user input. Uses the input to search and bring back data. Starts search when the length of the input is more then 2. As soon as you hit the 3rd character something is causing the input to clear which I don't want.
Vue.component('person-field', {
props: ['userSearch'],
template: '<input class="form-control" v-model="userSearch" >',
watch: {
userSearch: function () {
var arr = []
if (typeof this.userSearch !== 'undefined') { //added this because once i passed 3 characters in the field the userSearch variable becomes undefined
if (this.userSearch.length > 2) {
$.each(this.getUsers(this.userSearch), function (index, value) {
var obj = {
Title: value.Title,
ID: value.ID
}
arr.push(obj)
});
this.$emit('event_child', arr) //emits the array back to parent "eventChild" method
} else {
console.log('no length')
}
} else {
console.log('cant find field')
}
},
},
methods: {
getUsers: function (filter) {
//gets and returns an array using the filter as a search
return arr
},
}
});
Component 2 - based on the personListArray which is passed as a prop, displays the results as a list (this works)
Vue.component('person-search', {
props: ['prop'],
template: '<ul id="personList">' +
'<personli :ID="person.ID" v-for="person in persons">' +
'<a class="" href="#" v-on:click="fieldManagerTest(person.Title, person.ID)">{{person.Title}}</a>' +
'</personli></ul>',
computed: {
persons: function () {
return this.prop
}
},
methods: {
fieldManagerTest: function (title, ID) { //Remove item from users cart triggered via click of remove item button
//var user = ID + ';#' + title
//this.internalValue = true
//this.$emit('fieldManagerTest');
//this.$parent.$options.methods.selectManager(user)
},
},
});
Component 3, part of component 2
Vue.component('personli', {
props: ['ID'],
template: '<transition name="fade"><li class="moving-item" id="ID"><slot></slot></li></transition>'
})
;
The reason you get the warning,
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:
"userSearch" (found in PersonField)
Is because of this line
<input class="form-control" v-model="userSearch" >
v-model will attempt to change the value of the expression you've told it to, which in this case is userSearch, which is a property.
Instead, you might copy userSearch into a local variable.
Vue.component('person-field', {
props: ['userSearch'],
data(){
return {
searchValue: this.userSearch
}
},
template: '<input class="form-control" v-model="searchValue" >',
...
})
And modify your watch to use searchValue.
Here is an example.