I am trying to figure out how the this.$set (aka Vue.set) api works when using it to update an multidimensional array.
Given:
new Vue({
el: '#app',
data: {
rows:[{"id": "4", "edit": "true" }, { "id": "5", "edit": "false" }]
},
....
How will I use $this.set to do something like this:
this.rows[0].edit = false
I know this doesn't work:
this.$set(this.rows2, 0, false)
What is the correct way to use $this.set for a KV pair array ?
Since the edit properties in your rows objects are already set, you do not need to use Vue.set in this case. You can just set the property value and Vue will notice the change:
this.rows[0].edit = false;
Here's a simple example:
new Vue({
el: '#app',
data() {
return {
rows:[
{ "id": "4", "edit": true },
{ "id": "5", "edit": false }
],
}
},
methods: {
editNext() {
let index = this.rows.findIndex(r => r.edit);
this.rows[index].edit = false;
let next = ++index % this.rows.length;
this.rows[next].edit = true;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.min.js"></script>
<div id="app">
<div v-for="(row, i) in rows" v-if="rows[i].edit">
Editing Row ID {{ row.id }}
</div>
<button #click="editNext">Edit Next</button>
</div>
However, if the edit property of your row objects were not set initially (or if you just wanted to be safe), then you would need to use Vue.set in order to add the property and have it be reactive:
this.$set(this.rows[0], 'edit', false);
Here's an example of that case:
new Vue({
el: '#app',
data() {
return {
rows:[
{ "id": "4", "edit": true },
{ "id": "5" }
],
}
},
methods: {
editNext() {
let i = this.rows.findIndex(r => r.edit);
this.$set(this.rows[i], 'edit', false);
let next = ++i % this.rows.length;
this.$set(this.rows[next], 'edit', true);
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.min.js"></script>
<div id="app">
<div v-for="row in rows" v-if="row.edit">
Editing Row ID {{ row.id }}
</div>
<button #click="editNext">Edit Next</button>
</div>
Here's the documentation on Vue's Change Detection Caveats.
Related
I have JSON data hundreds of entries like this:
{
"product":"Protec",
"type":"Central Opening",
"attribute":"Triple Lock",
"height":"2100",
"width":"1600",
"price":"3000"
},
{
"product":"Protec",
"type":"Sliding Door",
"attribute":"Single Lock",
"height":"2100",
"width":"1600",
"price":"3000"
},
{
"product":"ForceField",
"type":"Hinge Door",
"attribute":"Triple Lock",
"height":"2300",
"width":"1200",
"price":"100"
},
my vue component
var distinct_product = new Vue({
el: '#distinct',
data:{
distinct_product: [],
all_products: []
},
I fetch it and store it in my vue component and store it in a second data so when I render it to the ui the user only sees distinct elements.
mounted: async function(){
fetch("/Data/products.json")
.then(res => res.json())
.then(res => {
this.all_products = res
this.distinct_product = res
var disProduct = [...new Set(this.distinct_product.map(x => x.product))]
var disType = [...new Set(this.distinct_product.map(x => x.type))]
var disAttribute = [...new Set(this.distinct_product.map(x => x.attribute))]
this.distinct_product.productArray = disProduct;
this.distinct_product.typeArray = disType;
this.distinct_product.attributeArray = disAttribute;
My problem is, it also renders elements that aren't available to certain products.
for example a product : 'Window' can't have the attribute : 'triple locks'
I was wondering if I could filter/map the all_products array as the user selects a product.
I looked into computed properties mainly but I'm not sure of a good way to do it. this is my first attempt at a web app and I'm fairly new to JS too.
I aimed to iterate through the array pushing only objects containing the product selected in the UI
atm this is what I've attempted with no luck:
this.distinct_product.product which is bound to the UI
for (var i = 0; i < this.all_products.length; i++){
if (this.all_products[i] === this.distinct_product.product){
this.product.push(i);
return this.product;
}
}
so it would iterate over all_products looking for objects containing this.distinct_product.product which would contain 'Protec' or another product
Am I going at this the wrong way? should I step back in general and try and work with that data a different way?
Sorry if the question is structured poorly it's a skill I'm trying to work on, criticism is welcomed.
You are on the right track. I'll share a simple example so you can understand and make changes to your code accordingly.
var productdata = [
{
"product": "Protec",
"type": "Central Opening",
"attribute": "Triple Lock",
"height": "2100",
"width": "1600",
"price": "3000"
},
{
"product": "Protec",
"type": "Sliding Door",
"attribute": "Single Lock",
"height": "2100",
"width": "1600",
"price": "3000"
},
{
"product": "ForceField",
"type": "Hinge Door",
"attribute": "Triple Lock",
"height": "2300",
"width": "1200",
"price": "100"
},
];
//setTimeout(function () {
distinct_productVue = new Vue({
el: '#distinct',
data: {
//selected: {},
distinct_products: [],
all_products: productdata.map(function (x, index) {
return { text: x.product, value: index + 1 };
}),
selected: '0'
},
computed: {
},
mounted: function () {
this.all_products.unshift({ text: 'Please select a product', value: 0 });
},
methods: {
getDistinctProduct: function () {
var self = this;
self.distinct_products = productdata.filter(function (x, index) {
if (x.product === self.all_products[self.selected].text) {
return { text: x.product, value: index };
}
else { return false; }
});
}
}
});
<html>
<head>
<script src='https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.0/vue.min.js'></script>
</head>
<body>
<div id="distinct">
<select v-model="selected" v-on:change="getDistinctProduct">
<option v-for="option in all_products" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
<!--<span>Selected: {{ selected }}</span>-->
<div v-show="selected != 0" style="margin-top:15px;">
<b>Available products</b>
<div v-for="pro in distinct_products" style="margin-top:15px;">
<div>product: {{pro.product}}</div>
<div>type: {{pro.type}}</div>
<div>attribute: {{pro.attribute}}</div>
<div>height: {{pro.height}}</div>
<div>width: {{pro.width}}</div>
<div>price: {{pro.price}}</div>
</div>
</div>
</div>
</body>
</html>
In my case, I have data array with multiple objects
data() {
return {
selected: 0,
presetData: [true, true, true],
data: [
{
name: "name 1"
},
{
name: "name 2"
}
]
};
},
then I want to push inside each object in data like below
setNewData() {
this.data.forEach((o, i) => {
this.$set(this.data[i], "time", this.presetData);
});
},
now my with presetData pushed into data will look like this
data: [
{
name: "name 1",
time: [true, true, true]
},
{
name: "name 2",
time: [true, true, true]
}
]
and I want to change individual time property of each object, which I use something like below
$set(item.time,selected,true)
My Issue
my issue is, this going to change both objects time property. How do I first push/set correctly presetData to data, below is my entire code , I'm sorry I'm very new to programming, here is the link to jsfiddle
new Vue({
el: "#app",
data() {
return {
selected: 0,
presetData: [true, true, true],
data: [
{
name: "name 1",
},
{
name: "name 2",
}
]
};
},
methods: {
setNewData() {
this.data.forEach((o, i) => {
this.$set(this.data[i], "time", this.presetData);
});
},
}
})
<div id="app">
<button #click="setNewData">Set Data</button>
<br>
<br>
<select v-model="selected">
<option>0</option>
<option>1</option>
<option>2</option>
</select>
<div v-for="item in data" :key="item.id">
<p>{{item.name}}</p>
<p>{{item.time}}</p>
<button #click="$set(item.time,selected,true)">Change True</button>
<button #click="$set(item.time,selected,false)">Change False</button>
</div>
This is an object reference issue. Each of your time properties references the same array (presetData). You can break out of this problem by making shallow copies via spread syntax.
You can also avoid Vue.set() when assigning new data using the same technique
setNewData() {
this.data = this.data.map(d => ({
...d, // create a shallow copy of each data item
time: [...this.presetData] // add "time" as a shallow copy of presetData
}))
},
To change individual array elements within the time property, you need to continue using Vue.set(), ie
this.$set(item.time, selected, true)
In my case, I have data array with multiple objects
data() {
return {
selected: 0,
presetData: [true, true, true],
data: [
{
name: "name 1"
},
{
name: "name 2"
}
]
};
},
then I want to push inside each object in data like below
setNewData() {
this.data.forEach((o, i) => {
this.$set(this.data[i], "time", this.presetData);
});
},
now my with presetData pushed into data will look like this
data: [
{
name: "name 1",
time: [true, true, true]
},
{
name: "name 2",
time: [true, true, true]
}
]
and I want to change individual time property of each object, which I use something like below
$set(item.time,selected,true)
My Issue
my issue is, this going to change both objects time property. How do I first push/set correctly presetData to data, below is my entire code , I'm sorry I'm very new to programming, here is the link to jsfiddle
new Vue({
el: "#app",
data() {
return {
selected: 0,
presetData: [true, true, true],
data: [
{
name: "name 1",
},
{
name: "name 2",
}
]
};
},
methods: {
setNewData() {
this.data.forEach((o, i) => {
this.$set(this.data[i], "time", this.presetData);
});
},
}
})
<div id="app">
<button #click="setNewData">Set Data</button>
<br>
<br>
<select v-model="selected">
<option>0</option>
<option>1</option>
<option>2</option>
</select>
<div v-for="item in data" :key="item.id">
<p>{{item.name}}</p>
<p>{{item.time}}</p>
<button #click="$set(item.time,selected,true)">Change True</button>
<button #click="$set(item.time,selected,false)">Change False</button>
</div>
This is an object reference issue. Each of your time properties references the same array (presetData). You can break out of this problem by making shallow copies via spread syntax.
You can also avoid Vue.set() when assigning new data using the same technique
setNewData() {
this.data = this.data.map(d => ({
...d, // create a shallow copy of each data item
time: [...this.presetData] // add "time" as a shallow copy of presetData
}))
},
To change individual array elements within the time property, you need to continue using Vue.set(), ie
this.$set(item.time, selected, true)
I have a problem with binding checkboxes using Vuex. On checkbox I use v-model with variable which has getter and setter to set or get value in store, the problem is that I get wrong data in store and I don't understand what cause the problem. Checkboxes bind to store property and this property must contain array of id's from checkboxes, but when I click checkbox more than one time it rewrite or remove store values. Can anyone help me to understand why does this happens? Link to jsFiddle.
The code
const store = new Vuex.Store({
state: {
checkboxes: {},
checked: {}
},
mutations: {
setCheckboxes(state, dataObj){
console.log(dataObj);
state.checkboxes = dataObj.data;
let firstElem = dataObj.data[Object.keys(dataObj.data)[0]];
state.checked[firstElem.parent_id] = [firstElem.id];
console.log(state.checked);
},
setTreeState(state, dataObj){
state.checked[dataObj.id] = dataObj.value;
console.log(state.checked);
}
}
});
Vue.component('checkboxTree', {
template: "#checkboxTree",
});
Vue.component('checkboxToggle', {
template: "#checkboxToggle",
data(){
return {
store
}
},
computed: {
value:{
get(){
return store.state.checked[this.checkbox.parent_id];
},
set(val){
store.commit({
type: 'setTreeState',
id: this.checkbox.parent_id,
value: val
});
},
},
},
props: ['checkbox']
});
const app = new Vue({
el: "#app",
store,
data: {
checkboxData: {
...
},
},
mounted(){
this.$store.commit({
type: 'setCheckboxes',
data: this.checkboxData
});
}
})
Template
<div id="app">
<checkbox-tree :checkboxData="checkboxData"></checkbox-tree>
</div>
<template id="checkboxTree">
<div>
<p>checkbox tree</p>
<form>
<ul>
<li v-for="checkbox in $store.state.checkboxes">
<checkbox-toggle :checkbox="checkbox"></checkbox-toggle>
</li>
</ul>
</form>
</div>
</template>
<template id="checkboxToggle">
<div>
<label>{{ checkbox.id }}</label>
<input type="checkbox"
:value="checkbox.id"
:id="'checkbox-' + checkbox.id"
:name="'checkbox-' + checkbox.id"
v-model="value"
>
</div>
</template>
Okay, assuming you want checked to contain ids of selected objects, I had to restructure your code significantly:
const removeFromArray = (array, value) => {
const newArray = [...array];
const index = newArray.indexOf(value);
if (index > -1) {
newArray.splice(index, 1);
return newArray;
}
return array;
}
const store = new Vuex.Store({
state: {
checkboxes: {},
checked: [],
},
mutations: {
addToChecked(state, id) {
state.checked.push(id);
},
removeFromChecked(state, id) {
const newArray = removeFromArray(state.checked, id);
state.checked = newArray;
},
setCheckboxes(state, data) {
state.checkboxes = data;
},
}
});
Vue.component('checkboxTree', {
template: "#checkboxTree",
computed: {
checkboxes() {
return this.$store.state.checkboxes;
},
},
});
Vue.component('checkboxToggle', {
template: "#checkboxToggle",
computed: {
value:{
get(){
return this.$store.state.checked.indexOf(this.checkbox.id) > -1;
},
set(val){
const mutation = val ? 'addToChecked' : 'removeFromChecked';
this.$store.commit(mutation, this.checkbox.id);
},
},
},
props: ['checkbox'],
});
const app = new Vue({
el: "#app",
store,
data: {
checkboxData: {
"5479": {
"id": 5479,
"title": "Место оказания услуг",
"type": "checkbox",
"dependencies": "",
"description": "",
"parent_id": 5478,
"npas": ""
},
"5480": {
"id": 5480,
"title": "Способы оказания услуг",
"type": "checkbox",
"dependencies": "",
"description": "",
"parent_id": 5478,
"npas": "50"
},
"5481": {
"id": 5481,
"title": "Объем и порядок содействия Заказчика в оказании услуг",
"type": "checkbox",
"dependencies": "",
"description": "",
"parent_id": 5478,
"npas": "54"
},
}
},
computed: {
stateRaw() {
return JSON.stringify(this.$store.state, null, 2);
},
},
mounted() {
this.$store.commit('setCheckboxes', this.checkboxData);
const firstElementKey = Object.keys(this.checkboxData)[0];
const firstElement = this.checkboxData[firstElementKey];
this.$store.commit('addToChecked', firstElement.id);
}
})
<script src="https://unpkg.com/vue"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vuex/3.0.1/vuex.js"></script>
<div id="app">
<checkbox-tree :checkboxData="checkboxData"></checkbox-tree>
<pre v-text="stateRaw"></pre>
</div>
<template id="checkboxTree">
<div>
<p>checkbox tree</p>
<form>
<ul>
<li v-for="checkbox in checkboxes">
<checkbox-toggle :checkbox="checkbox"></checkbox-toggle>
</li>
</ul>
</form>
</div>
</template>
<template id="checkboxToggle">
<div>
<label>{{ checkbox.id }}</label>
<input
type="checkbox"
:value="checkbox.id"
:id="'checkbox-' + checkbox.id"
:name="'checkbox-' + checkbox.id"
v-model="value">
{{value}}
</div>
</template>
Using this code as an example, you can populate checked however you want to.
Also, a jsfiddle link for you: https://jsfiddle.net/oniondomes/ckj7mgny/
I am trying to sort a JSON array from JSON file a.json.
The array is coming like this:
{"data":
[
{"exception":"",
"name":"Data Server1",
"alias":"TOR-Server",
"delayed":"NO",
},
{"exception":"",
"name":"Data Server2",
"alias":"FRA-Server",
"delayed":"NO",
}
]
I need to sort the data by the "alias name", coming from the JSON file with Vue JS.
This is my Javascript Code for the display in Vue JS
<script type="text/javascript">
var app = new Vue({
el: '#app',
data: {
json: null
},
computed: {
sorted: function() {
setTimeout(function() {
var app = this.app.json
if (app.length >= 6)
return app;
}, 5000);
}
},
methods: {
toggleClass(){
if (this.failed == true){
this.failed = false;
}
else
{
this.failed = true;
}
}
}
But the Sorted function is not working and if I try to display the servers in the sorted array, I receive a blank page.
And my for loop in the HTML page is:
<div class="mainbutton" v-for="(server, index) in json.data ">
Hope this makes sense and I could get it working.
You can use Array.sort inside a computed, to return the sorted array.
For example, to sort the array's items by name property, you can call: this.json.sort((t1,t2) => t1.name < t2.name ? -1 : 1).
Here's a working snippet:
var app = new Vue({
el: '#app',
data: {
json: [
{
"exception": "",
"name": "Data Server3",
"alias": "TOR-Server",
"delayed": "NO",
},
{
"exception": "",
"name": "Data Server1",
"alias": "TOR-Server",
"delayed": "NO",
},
{
"exception": "",
"name": "Data Server2",
"alias": "FRA-Server",
"delayed": "NO",
}
]
},
computed: {
sortedJson: function() {
return this.json.sort((t1,t2) => t1.name < t2.name ? -1 : 1);
},
sorted: function() {
setTimeout(function() {
var app = this.app.json
if (app.length >= 6)
return app;
}, 5000);
}
},
methods: {
toggleClass() {
if (this.failed == true) {
this.failed = false;
} else {
this.failed = true;
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>
<div id="app">
<div class="mainbutton" v-for="(server, index) in sortedJson ">
{{server.name }}
</div>
</div>