Vue.JS using class for element - javascript

I try to give v-if="seen" for some class but it doesn't work obviously...
My code:
<div class="item" v-if="seen">item 1</div>
<div class="item" v-if="seen">item 2</div>
<div class="item" v-if="seen">item 3</div>
var item = new Vue({
el: 'div.item',
data: {
seen: true
}
});
In JavaScript I could do :
var item = document.getElementsByClassName('item');
for(var i = 0; i < item.length; i++){
item[i].style.display = "none";
}
How must I do in Vue.js ? Thanks

You can try using a v-for and setup the data to use an array.
Try something like this:
<div id="app">
<div v-for="myItem in items" class="item" v-if="myItem.seen">{{myItem.name}}</div>
</div>
var app = new Vue({
el: '#app',
data: {
items : [{
seen: true,
name: 'item 1'
},
{
seen: false,
name: 'item 2'
},
{
seen: false,
name: 'item 3'
}]
}
});

The way Vue is designed, it should be ideally done like so:
<div id="app">
<div class="item" v-if="seen">item 1</div>
<div class="item" v-if="seen">item 2</div>
<div class="item" v-if="seen">item 3</div>
</div>
var app = new Vue({
el: '#app',
data: {
seen: true
}
});

There is many ways to achieve what you want. Example of one of them:
<div is="app">
<div class="item" v-if="!seen.includes('item1')">
item 1
</div>
<div class="item" v-if="!seen.includes('item2')">
item 2
</div>
<div class="item" v-if="!seen.includes('item3')">
item 3
</div>
</div>
var item = new Vue({
el: '#app',
data: {
seen: [
'item1',
'item3'
]
}
})

var item = new Vue({
el: 'div.item',
data: {
isSeen: true
},
computed:{
seen:()=>this.isSeen;
}
});
or you could use v-show or v-class

Related

How can I work around the limitation of multiple root elements in Vue.js? [duplicate]

This question already has answers here:
A way to render multiple root elements on VueJS with v-for directive
(6 answers)
Closed 2 years ago.
hopefully someone here will be able to help me with this problem.
I have the following data:
[
{
title: 'Header',
children: [
{
title: 'Paragraph',
children: [],
},
],
},
{
title: 'Container',
children: [
{
title: 'Paragraph',
children: [],
},
],
},
]
I want to render this in a list of <div> like this:
<div class="sortable-item" data-depth="1" data-index="0">Header</div> <!-- Parent -->
<div class="sortable-item" data-depth="2" data-index="0">Paragraph</div> <!-- Child-->
<div class="sortable-item" data-depth="1" data-index="1">Container</div> <!-- Parent -->
<div class="sortable-item" data-depth="2" data-index="0">Paragraph</div> <!-- Child-->
I have built a component that would be recursive, this is what I have so far:
<template>
<template v-for="(item, index) in tree">
<div
class="sortable-item"
:data-depth="getDepth()"
:data-index="index"
:key="getKey(index)"
>
{{ item.title }}
</div>
<Multi-Level-Sortable
:tree="item.children"
:parent-depth="getDepth()"
:parent-index="index"
:key="getKey(index + 0.5)"
></Multi-Level-Sortable>
</template>
</template>
<script>
export default {
name: 'MultiLevelSortable',
props: {
tree: {
type: Array,
default() {
return [];
},
},
parentDepth: {
type: Number,
},
parentIndex: {
type: Number,
},
},
methods: {
getDepth() {
return typeof this.parentDepth !== 'undefined' ? this.parentDepth + 1 : 1;
},
getKey(index) {
return typeof this.parentIndex !== 'undefined' ? `${this.parentIndex}.${index}` : `${index}`;
},
},
};
</script>
As you can see not only I have a <template> as the root element I also have a v-for, two "no no" for Vue.js. How can I solve this to render the list of elements like I pointed out above?
Note: I have tried vue-fragment and I was able to achieve the structure I wanted, but then when I tried using Sortable.js it didn't work, as if it wouldn't recognise any of the .sortable-item elements.
Any help will be greatly appreciated! Thank you!
Thanks to #AlexMA I was able to solve my problem by using a functional component. Here is what it looks like:
import SortableItemContent from './SortableItemContent.vue';
export default {
functional: true,
props: {
tree: {
type: Array,
default() {
return [];
},
},
},
render(createElement, { props }) {
const flat = [];
function flatten(data, depth) {
const depthRef = typeof depth !== 'undefined' ? depth + 1 : 0;
data.forEach((item, index) => {
const itemCopy = item;
itemCopy.index = index;
itemCopy.depth = depthRef;
itemCopy.indentation = new Array(depthRef);
flat.push(itemCopy);
if (item.children.length) {
flatten(item.children, depthRef);
}
});
}
flatten(props.tree);
return flat.map((element) => createElement('div', {
attrs: {
'data-index': element.index,
'data-depth': element.depth,
class: 'sortable-item',
},
},
[
createElement(SortableItemContent, {
props: {
title: element.title,
indentation: element.indentation,
},
}),
]));
},
};
The SortableItemContent component looks like this:
<template>
<div class="item-content">
<div
v-for="(item, index) in indentation"
:key="index"
class="item-indentation"
></div>
<div class="item-wrapper">
<div class="item-icon"></div>
<div class="item-title">{{ title }}</div>
</div>
</div>
</template>
<script>
export default {
name: 'SortableItemContent',
props: {
title: String,
indentation: Array,
},
};
</script>
Given the data I have posted on my question, it now renders the HTML elements like I wanted:
<div data-index="0" data-depth="0" class="sortable-item">
<div class="item-content">
<div class="item-wrapper">
<div class="item-icon"></div>
<div class="item-title">Header</div>
</div>
</div>
</div>
<div data-index="0" data-depth="1" class="sortable-item">
<div class="item-content">
<div class="item-indentation"></div>
<div class="item-wrapper">
<div class="item-icon"></div>
<div class="item-title">Paragraph</div>
</div>
</div>
</div>
<div data-index="1" data-depth="0" class="sortable-item">
<div class="item-content">
<div class="item-wrapper">
<div class="item-icon"></div>
<div class="item-title">Container</div>
</div>
</div>
</div>
<div data-index="0" data-depth="1" class="sortable-item">
<div class="item-content">
<div class="item-indentation"></div>
<div class="item-wrapper">
<div class="item-icon"></div>
<div class="item-title">Paragraph</div>
</div>
</div>
</div>
Thank you again #AlexMA for the tip on Functional Components.

To display dynamic JSON data in 2 different div's

My JSON looks like this:
users: [
{ 'name': 'User 1'},
{ 'name': 'User 2'},
{ 'name': 'User 3'},
{ 'name': 'User 4'},
{ 'name': 'User 5'},
{ 'name': 'User 6'},
]
Now i am looping this and i am displaying in the same div, But i need to diaplay the data by these conditions:
Up to length 3 should display in one div and rest things should display in another div(Ex another div right to that div). Here the JSON will be dynamic, The length may be <3 or >3. My requirement looks like this:
JSFiddle link
Vue is convenient to accomplish such tasks.
You need another two computed properties based on users.
template:
<div>{{left}}</div>
<div>{{right}}</div>
computed: {
left: function(){
return this.users.slice(0, 3);
},
reight: function() {
return this.users.slice(3);
}
}
Another option: https://jsfiddle.net/kth61cLu/1/
<div id="app">
<h3>Users</h3>
<div class="users1">
<div v-for="(user, index) in users" v-if="index < 3">
<p>{{user.name}}</p>
</div>
</div>
<div v-if="users.length > 3" class="users2">
<div v-for="(user, index) in users" v-if="index > 3">
<p>{{user.name}}</p>
</div>
</div>
</div>
Create a computed property that splits your array into two with the first having three elements and the second having the rest.
Then loop over the splitUsers array to display.
new Vue({
el: '#app',
data: {
users: [{"name":"User 1"},{"name":"User 2"},{"name":"User 3"},{"name":"User 4"},{"name":"User 5"},{"name":"User 6"}]
},
computed: {
splitUsers () {
const split = [ this.users.slice(0, 3) ]
if (this.users.length > 3) {
split.push(this.users.slice(3))
}
return split
}
}
})
#app { display: flex; }
#app div { padding: 1rem; border: 1px solid black; }
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>
<div id="app">
<div v-for="chunk in splitUsers">
<p v-for="user in chunk">{{ user.name }}</p>
</div>
</div>
OK, here is what you can try.
<h3>Users</h3>
<div v-for="(user) in users.slice(0,3)">
<p>{{user.name}}</p>
</div>
<div v-for="(user) in users.slice(3)">
<p>{{user.name}}</p>
</div>
Hope it helps!

Vue emit ref of another element on click

Hello how i can get the element by className or something else. So i need to get element by className actually but i can't figure out how to do that in this case:
here is my fiddle: https://jsfiddle.net/cihanzengin/aq9Laaew/294154/
Simply i wanna do that: When click to menu in method i try to get element which have classname nav. I tried to make with ref but i can't
here is my code :
<div id="app">
<some-component #get-element="getElement"></some-component>
</div>
<script>
var someComponent = Vue.component("some-component", {
template: `
<div class="columns mobile-navigation">
<div class="column drawer">
<a class="is" #click="$emit('get-element')">MENU</a>
</div>
<div ref="nav" class="column mobile-nav-wrapper">
<p> Some Text </p>
</div>
</div>
`
});
var app = new Vue({
el: '#app',
data: {
},
components: {
"mobile-nav": mobileNav
},
methods: {
getElement() {
console.log(this.$refs.nav);
}
}
});
</script>
You can try something like this.
var classToCheck = 'myclass';
if( this.$refs.nav.classList.includes(classToCheck) ){
// includes above class
}
OR
myclickevent(event){
event.target.classList // this will get you classList of of clicked element then you can compare
}
This contains all the classes for your element
this.$refs.nav.classList
i found the solution:
here is need to add **<some-component>** to ref attribute for accessing to ref inside jsx.
Then will possible to access to nav ref with: this.$refs.someRef.$refs.nav
<div id="app">
<some-component #get-element="getElement" ref="someRef"></some-component>
</div>
<script>
var someComponent = Vue.component("some-component", {
template: `
<div class="columns mobile-navigation">
<div class="column drawer">
<a class="is" #click="$emit('get-element')">MENU</a>
</div>
<div ref="nav" class="column mobile-nav-wrapper">
<p> Some Text </p>
</div>
</div>
`
});
var app = new Vue({
el: '#app',
data: {
},
components: {
"mobile-nav": mobileNav
},
methods: {
getElement() {
console.log(this.$refs.someRef.$refs.nav);
}
}
});
</script>

- Cannot use v-for on stateful component root element because it renders multiple elements

Getting the error the error in the title, I am new to vue.js and I cannot figure it out
Cannot debug this for the life of me, can somebody help?
const app = new Vue({
el: '#location-box',
data: {
locations: [
{
name: "Europe",
desc: "Loren ipsum"
},
{
name: "America",
desc: "Loren ipsum"
}
],
},
})
My HTML:
<div id="location-section">
<div class="main-container">
<div class="location-grid-container">
<div id="info-box" class="outline">
</div>
<div>
<div id="location-box" v-for="location in locations" class="outline">
<h1>{{location.name}}</h1>
</div>
</div>
</div>
</div>
The root element that you pass to the el option of your new Vue app must be unique, and serve only as a placeholder.
Then you can use Vue directives on its children.
So in your case you could do:
<div id="location-section">
<div class="main-container">
<div class="location-grid-container">
<div id="info-box" class="outline">
</div>
<div id="location-box"><!-- Root element for your Vue app -->
<div v-for="location in locations" class="outline">
<h1>{{location.name}}</h1>
</div>
</div>
</div>
</div>
new Vue({
el: '#location-box',
// etc.
});

How to Add or Remove Vue.js component dynamically (programmatically or on the fly)

Here is my code, this is just a example code, if the below works then this will help me to build something else that I am working on.
<template>
<div id="wrapper">
<div id="divOne">
<!-- Add or remove component here dynamically -->
</div>
<div id="divTwo">
<!-- Add or remove component here dynamically -->
</div>
<!-- There will be more divs like #divOne #divTwo above -->
<div>
<input type="radio" id="one" value="divOne" v-model="pickedDiv">
<label for="one">One</label>
</div>
<div>
<input type="radio" id="two" value="divTwo" v-model="pickedDiv">
<label for="two">Two</label>
</div>
<button #click="addComponent">Add Component</button>
</div>
</template>
<script>
import SomeComponent from './SomeComponent'
export default {
data() {
return {
pickedDiv: '',
pickedDivPreviously: ''
propItems: ['item1', 'item2']
}
}
methods: {
addComponent () {
//-- This is not working code but I need something like this --//
this.pickedDivPreviously = this.pickedDiv // event not sure how to get previously selected div
const divThatIsPicked = document.getElementById(this.pickedDiv)
const divThatWasPickedPreviously = document.getElementById(this.pickedDivPreviously)
// code here to remove/empty/destroy old component from 'divThatWasPickedPreviously'
divThatWasPickedPreviously.innerHTML = ""
// code here to add new component in 'divThatIsPicked'
divThatIsPicked.appendChild('<some-component :someProp="propItems" #someEvent="someFn">')
}
}
}
</script>
I don't want to distract you from answering actual question but If you are curious about what I am working then check this :) Here I am trying to add new child DIV at the end of the row when any row item is clicked.
I will be more than happy if this is converted to vue than the actual question asked above, as said please don't get distracted from actual question if you find it hard :)
I got help from JamesThomson in forum.vuejs.org, though the solution did not fix my issue but I got to understand the limitation or possibilities of using Vue.js.
JamesThomson says:
Yeah, your example code definitely won’t work. When working with Vue
you need to think in a data oriented way, not DOM oriented (like
jQuery)
Taken from your SO post:
Here I am trying to add new child DIV at the end of the row when any
row item is clicked.
I assume this is your end goal for this topic. A simple example of
this can be achieved like so:
https://codepen.io/getreworked/pen/XZOgbm?editors=1010
let Welcome = {
template: `
<p #click="toggleMsg()">Welcome {{ msg }}!</p>
`,
data () {
return {
msg: 'home'
}
},
methods: {
toggleMsg () {
return this.msg = this.msg === 'home' ? 'back' : 'home';
}
}
}
const App = new Vue({
el: '#app',
data: {
children: [
Welcome
]
},
methods: {
add () {
this.children.push(Welcome);
},
}
});
<link rel="stylesheet" href="//cdn.rawgit.com/milligram/milligram/master/dist/milligram.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<div id="app">
<template v-for="(child, index) in children">
<component :is="child" :key="child.name"></component>
</template>
<button #click="add()">Add Another</button>
</div>
or you can use a render function for more flexibility
https://jsfiddle.net/jamesbrndwgn/ku7m1dp0/9/
const Reusable = {
template: '<div>{{ name }} {{ bar }}</div>',
props: {
name: {
type: String
}
},
data () {
return {
bar: 'Bar'
}
}
}
const App = new Vue({
el: '#app',
data: {
items: []
},
methods: {
addComponent () {
const renderComponent = {
render (h) {
return h(Reusable, {
class: ['foo'],
props: {
name: 'Foo'
}
})
}
}
this.items.push(renderComponent)
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<link rel="stylesheet" href="//cdn.rawgit.com/milligram/milligram/master/dist/milligram.min.css">
<div id="app">
<component v-for="item in items" ref="itemRefs" :is="item" :key="item.name"></component>
<button #click="addComponent">Add Component</button>
</div>
I found one of the other ways that does kinda same as above but work only with old vue.js-1 not with vue.js-2:
var createNewBox = function() {
var MyPartial = Vue.extend({});
window.partial = new MyPartial({
template: '#partial',
data: function() {
return {
txt: 'This is partial'
}
},
methods: {
print: function() {
console.log('this.txt : ' + this.txt)
console.log('main.txt : ' + main.txt)
},
},
})
window.partial.$mount().$appendTo('body')
}
window.main = new Vue({
el: '#main',
data: function() {
return {
txt: 'This is main'
}
},
methods: {
show: function() {
createNewBox()
}
},
})
<script src="https://cdn.bootcss.com/vue/1.0.17/vue.min.js"></script>
<div #click="show" style="width:200px;height:200px;background:#000" id="main">
<template id="partial">
<div style="width:100px;height:100px;background:#ff0" #click.stop="print"></div>
</template>
</div>
this converted to Vue.
https://codepen.io/jacobgoh101/pen/Kojpve
<div id="app">
<div class="parent">
<div class="child" #click="handleChildClick" data-new-child-id="1">1234</div>
<div class="child" #click="handleChildClick" data-new-child-id="2">12341234 </div>
<div class="child" #click="handleChildClick" data-new-child-id="3">123412341234</div>
<div class="child" #click="handleChildClick" data-new-child-id="4">1234</div>
<div class="new-child" v-if="[1,2,3,4].indexOf(showNewChild) > -1">boom</div>
<div class="child" #click="handleChildClick" data-new-child-id="5">12341234</div>
<div class="child" #click="handleChildClick" data-new-child-id="6">123412341234</div>
<div class="child" #click="handleChildClick" data-new-child-id="7">1234</div>
<div class="child" #click="handleChildClick" data-new-child-id="8">12341234</div>
<div class="new-child" v-if="[5,6,7,8].indexOf(showNewChild) > -1">boom</div>
<div class="child" #click="handleChildClick" data-new-child-id="9">123412341234</div>
<div class="new-child" v-if="[9].indexOf(showNewChild) > -1">boom</div>
</div>
</div>
Javascript
new Vue({
el: '#app',
data: {
showNewChild:null
},
methods: {
handleChildClick(e) {
let id = e.target.dataset.newChildId;
id = Number(id);
this.showNewChild = id;
}
}
})

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