Develop Reference

Access Table Header Row Key React

I was working with tables and I came across this issue: I want to access the data-row-key attribute (shown in the image below) in the table header row at a child row and I'm stuck. Code:
class App extends React.Component {
render() {
const columns = [
// sample of how the JSON API is read
{
title: "Title", dataIndex: "title", key: "title",
},
// the one that actually matters. becomes the actions column eventually
{
title: "Action", dataIndex: "", key: "x", width: "12%",
render: () => (
<Popconfirm
placement="topRight"
title="Are you sure to delete this task?"
// retrieve the data here as a parameter into the confirm(n) call
onConfirm={() => confirm(43)} okText="Yes" cancelText="No"
>
<a>delete</a>
</Popconfirm>
)
}
];
return (
<Table columns={columns} dataSource={this.state.data}/>
);
}
}
Right now I have the actual number (43) in there, but I want it to be dynamic as to be able to retrieve the data from the <tr data-row-key=...> tag, shown in the image below.
As a note, there is not a leading id column at the start of the table. The keys are provided through Django's rest framework -- which is in JSON format, in the very last image. Rendered results:
JSON format:
Can anyone please help me? Thanks in advance.

You can use the querySelector for it.
let value = document.querySelector('data-row-key')

How do you attach Vue.js events on dynamic elements added with jQuery.append()

I'm using Laravel & Vue.js. When I append some elements to page and change DOM using jQuery the Vue.js, events like #click & #blur will not work.
Is there any method to update DOM?
dropzone_success(file, response) {
$('.dz-details').append('<button type="button" class="thumb_button" id="'+response.path+'" #click="somemethod($event)">Make Default</button>');
}
And my method for example:
somemethod(event)
{
console.log(event.target);
}

You shouldn't probably be using Vue.js with jQuery in the first place, as they work in a much different concept. The following should give you some rough idea how this could be done in Vue.js alone:
const vm = new Vue({
data() {
return {
dropzone: {},
dropzoneOpts: {
// ...
},
responsePath: ''
}
},
mounted() {
this.dropzone = new Dropzone('#dropzone_id', {
...this.dropzoneOpts,
success: this.dropzone_success
});
},
methods: {
dropzone_success(file, response) {
this.responsePath = response.path;
},
somemethod(evt) {
// ...
}
}
});
<div class="dz-details">
<button
v-if="responsePath"
:id="responsePath"
class="thumb_button"
#click="somemethod">Make Default</button>
</div>
The point is, you don't do direct DOM manipulation with Vue.js as this framework is really building virtual DOM instead of the real DOM, it supports conditional rendering, two-way data binding, etc.
Check out this nice article on Declarative and Imperative programming.

Vue with VCalendar component: Keep data in sync with another Vue instance

I'm programming a page that displays a list of meetings in a table. It's also possible to edit and delete meetings. Now I'd like to offer an alternative view using VCalendar.
Data is received from the server on page load and stored in a JS variable. Both the Vue instance containing the table and the VCalendar component share this data. If I edit a table cell, the changes are reflected in the component. But when I delete a date in the table view, it remains in the calendar.
This is the relevant HTML (edit: Added some attributes to the td):
<calendar-component></calendar-component>
<table id='meetings-table'>
<tr v-for='meeting in meetings' :key='date.id'>
<td contenteditable #blur='handleInput($event,meeting,"name")>
#{{ meeting.name }}
</td>
<td>
<input type='checkbox' v-model='selected'
:value='meeting.id'>
</td>
</tr>
</table>
<div>
<button v-if='selected.length' #click='deleteMeetings'>
Delete selected rows
</button>
</div>
My JS (edit: Added handleInput method):
let table = new Vue({
el:'#meetings-table',
data: {
selected: [],
meetings: window.meetings,
},
methods: {
/**
* Deletes selected meetings.
*/
deleteMeetings: function () {
let requests = [];
// Make a single request and store it
for (let id of this.selected) {
requests.push(axios.delete('/termine/' + id)
.then(response => {
// Remove meetings
this.meetings = this.meetings.filter(t => t.id != id);
// Remove id from list of selected meetings
this.selected = this.selected.filter(elem => elem != id);
}));
}
const axiosArray = axios.all(requests);
},
/**
* Handles edits in table cells.
*/
handleInput: function($event, meeting, field) {
const newValue = $event.target.textContent;
// Update value in $data
meeting[field] = newValue;
// AJAX request follows, but is not necessary for this example to work
}
}
});
The relevant parts of the component:
<template>
<v-calendar :attributes='attributes'>
<div
slot='meeting-row'
slot-scope='{ customData }'>
<!-- Popover content omitted -->
</div>
</v-calendar>
</template>
<script>
let meetings = window.meetings;
export default {
data() {
return {
incId: meetings.length,
editId: 0,
meetings,
};
},
computed: {
attributes() {
return [
// Today attribute
{
// ...
},
// Meeting attributes
...this.meetings.map(meeting => ({
key: meeting.id,
dates: new Date('2018,11,31'),// moment(meeting.slot.date, 'DD.MM.YY').format('YYYY, MM, DD'), //meeting.dates,
customData: meeting,
order: meeting.id,
dot: {
backgroundColor: '#ff8080',
},
popover: {
// Matches slot from above
slot: 'meeting-row',
}
}))
];
}
}
};
</script>
This is what happens:
I load the page containing only a single meeting. The meeting is
shown both in the table and the calendar component. Vue devtools show
it in both meetings arrays (in the component as well as in the other
Vue instance). Using the console, I can also see it in
window.meetings.
After clicking the delete button (triggering the deleteMeetings method in my JS), the meeting is gone from the table, but remains in
the calendar, in the component's meetings array and in
window.meetings.
What do I have to change to keep the meetings arrays in sync even when deleting a meeting in the table? Note that I haven't yet implemented any methods for the calendar component.

Calendar, and table components should share a single state: currently selected meetings. From what I understand, right now you have that state in 2 separate places: table Vue instance, and a calendar-component, which is a child of some other Vue instance.
It may look like you're sharing the state already (with window.meetings), but it's not the case: you only initialize the same set of meetings when the components are created. And then changes in one component are not reflected in another component.
What you can try to do is to have meetings stored in the 'main' Vue app on your page, pass them as props to table and calendar components, and then trigger events from table and calendar components, when meetings array is modified. You should also define the event hanlders in the 'main' Vue app, and listen on components. A rough sketch of the solution:
<div id="app">
<table-component
:meetings="meetings"
#meetingUpdated="handleMeetingUpdate"
#meetingDeleted="handleMeetingDeletion"
></table-component>
<calendar-component
:meetings="meetings"
#meetingUpdate="handleMeetingUpdate"
#meetingDeleted="handleMeetingDeletion"
></calendar-component>
</div>
let app = new Vue({
el:'#app',
data: {
meetings: []
},
methods: {
handleMeetingUpdate(event) {
//
},
handleMeetingDeletion(event) {
//
},
}
//
});
I hope the above is enough to point you in the right direction. If not, please let me know, and I'll do my best to help you with this further.

rendering vue.js components and passing in data

I'm having trouble figuring out how to render a parent component, display a list of contracts in a list on part of the page, and when a user clicks on one of them, display the details of that specific contract on the other part of the page.
Here is my slim file:
#contracts_area
.filter-section
ul
li.filter-item v-for="contract in contractsAry" :key="contract.id" #click="showContract(contract)"
| {{ contract.name }}
.display-section
component :is="currentView" transition="fade" transition-mode="out-in"
script type="text/x-template" id="manage-contracts-template"
div
h1 Blank when page is newly loaded for now
script type="text/x-template" id="view-contract-template"
div :apply_contract="showContract"
h1#display-item__name v-name="name"
javascript:
Vue.component('manage-template', {
template: '#manage-contracts-template'
});
Vue.component('view-contract', {
template: '#view-contract-template',
props: ['show_contract'],
data: function() {
return {
name: ''
}
},
methods: {
showContract: function(contract) {
return this.name = contract.name
}
}
});
Vue.http.headers.common['X-CSRF-Token'] = $('meta[name="csrf-token"]').attr('content');
var contractsResource = Vue.resource('/all_contracts{/id}.json');
var contracts = new Vue({
el: '#contracts_area',
data: {
currentView: 'manage-template',
contractsAry: [],
errors: {}
},
mounted: function() {
var that = this;
contractsResource.get().then(
function(res) {
that.contractsAry = res.data;
}
)
},
methods: {
showContract: function(contract) {
this.currentView = 'view-contract'
}
}
});
Basically I'd like it so that when a user clicks on any contract item in the .filter-section, it shows the data for that contract in the .display-section. How can I achieve this?

In short you can bind a value to a prop.
.display-section
component :is="currentView" :contract="currentContract"
view-contract
props: ['contract']
contracts-area
data: {
currentContract: null,
},
methods: {
showContract: function(contract) {
this.currentView = "view-contract";
this.currentContract = contract;
}
}
There are multiple ways to pass data in Vue.
Binding values to props.
Using ref to directly call a method from a child component.
Custom Events. Note that to pass events globally, you will need a global event bus.
A single central source of truth (i.e. vuex)
I have illustrated methods 1, 2, 3 in Codepen
Note that 2nd and 3rd methods will only work after your component has been rendered. In your case, since your components for currentView are dynamic and when user clicked, display-section component does not yet exists; it will not receive any events yet. So their content will be empty at first.
To workaround this you can directly access $parent in mounted() from child component, however this would create coupling between them. Another solution is creating the components but conditionally displaying them. And one another solution would be waiting until child component has been mounted and then emitting events.
If your needs are simple I suggest binding values to props (1), else you may consider using something like vuex.

Passing data to components in vue.js

I'm struggling to understand how to pass data between components in vue.js. I have read through the docs several times and looked at many vue related questions and tutorials, but I'm still not getting it.
To wrap my head around this, I am hoping for help completing a pretty simple example
display a list of users in one component (done)
send the user data to a new component when a link is clicked (done) - see update at bottom.
edit user data and send it back to original component (haven't gotten this far)
Here is a fiddle, which fails on step two: https://jsfiddle.net/retrogradeMT/d1a8hps0/
I understand that I need to use props to pass data to the new component, but I'm not sure how to functionally do it. How do I bind the data to the new component?
HTML:
<div id="page-content">
<router-view></router-view>
</div>
<template id="userBlock" >
<ul>
<li v-for="user in users">{{user.name}} - <a v-link="{ path: '/new' }"> Show new component</a>
</li>
</ul>
</template>
<template id="newtemp" :name ="{{user.name}}">
<form>
<label>Name: </label><input v-model="name">
<input type="submit" value="Submit">
</form>
</template>
js for main component:
Vue.component('app-page', {
template: '#userBlock',
data: function() {
return{
users: []
}
},
ready: function () {
this.fetchUsers();
},
methods: {
fetchUsers: function(){
var users = [
{
id: 1,
name: 'tom'
},
{
id: 2,
name: 'brian'
},
{
id: 3,
name: 'sam'
},
];
this.$set('users', users);
}
}
})
JS for second component:
Vue.component('newtemp', {
template: '#newtemp',
props: 'name',
data: function() {
return {
name: name,
}
},
})
UPDATE
Ok, I've got the second step figured out. Here is a new fiddle showing the progress: https://jsfiddle.net/retrogradeMT/9pffnmjp/
Because I'm using Vue-router, I don't use props to send the data to a new component. Instead, I need set params on the v-link and then use a transition hook to accept it.
V-link changes see named routes in vue-router docs:
<a v-link="{ name: 'new', params: { name: user.name }}"> Show new component</a>
Then on the component, add data to the route options see transition hooks:
Vue.component('newtemp', {
template: '#newtemp',
route: {
data: function(transition) {
transition.next({
// saving the id which is passed in url
name: transition.to.params.name
});
}
},
data: function() {
return {
name:name,
}
},
})

-------------Following is applicable only to Vue 1 --------------
Passing data can be done in multiple ways. The method depends on the type of use.
If you want to pass data from your html while you add a new component. That is done using props.
<my-component prop-name="value"></my-component>
This prop value will be available to your component only if you add the prop name prop-name to your props attribute.
When data is passed from a component to another component because of some dynamic or static event. That is done by using event dispatchers and broadcasters. So for example if you have a component structure like this:
<my-parent>
<my-child-A></my-child-A>
<my-child-B></my-child-B>
</my-parent>
And you want to send data from <my-child-A> to <my-child-B> then in <my-child-A> you will have to dispatch an event:
this.$dispatch('event_name', data);
This event will travel all the way up the parent chain. And from whichever parent you have a branch toward <my-child-B> you broadcast the event along with the data. So in the parent:
events:{
'event_name' : function(data){
this.$broadcast('event_name', data);
},
Now this broadcast will travel down the child chain. And at whichever child you want to grab the event, in our case <my-child-B> we will add another event:
events: {
'event_name' : function(data){
// Your code.
},
},
The third way to pass data is through parameters in v-links. This method is used when components chains are completely destroyed or in cases when the URI changes. And i can see you already understand them.
Decide what type of data communication you want, and choose appropriately.

The best way to send data from a parent component to a child is using props.
Passing data from parent to child via props
Declare props (array or object) in the child
Pass it to the child via <child :name="variableOnParent">
See demo below:
Vue.component('child-comp', {
props: ['message'], // declare the props
template: '<p>At child-comp, using props in the template: {{ message }}</p>',
mounted: function () {
console.log('The props are also available in JS:', this.message);
}
})
new Vue({
el: '#app',
data: {
variableAtParent: 'DATA FROM PARENT!'
}
})
<script src="https://unpkg.com/vue#2.5.13/dist/vue.min.js"></script>
<div id="app">
<p>At Parent: {{ variableAtParent }}<br>And is reactive (edit it) <input v-model="variableAtParent"></p>
<child-comp :message="variableAtParent"></child-comp>
</div>

I think the issue is here:
<template id="newtemp" :name ="{{user.name}}">
When you prefix the prop with : you are indicating to Vue that it is a variable, not a string. So you don't need the {{}} around user.name. Try:
<template id="newtemp" :name ="user.name">
EDIT-----
The above is true, but the bigger issue here is that when you change the URL and go to a new route, the original component disappears. In order to have the second component edit the parent data, the second component would need to be a child component of the first one, or just a part of the same component.

The above-mentioned responses work well but if you want to pass data between 2 sibling components, then the event bus can also be used.
Check out this blog which would help you understand better.
supppose for 2 components : CompA & CompB having same parent and main.js for setting up main vue app. For passing data from CompA to CompB without involving parent component you can do the following.
in main.js file, declare a separate global Vue instance, that will be event bus.
export const bus = new Vue();
In CompA, where the event is generated : you have to emit the event to bus.
methods: {
somethingHappened (){
bus.$emit('changedSomething', 'new data');
}
}
Now the task is to listen the emitted event, so, in CompB, you can listen like.
created (){
bus.$on('changedSomething', (newData) => {
console.log(newData);
})
}
Advantages:
Less & Clean code.
Parent should not involve in passing down data from 1 child comp to another ( as the number of children grows, it will become hard to maintain )
Follows pub-sub approach.

I've found a way to pass parent data to component scope in Vue, i think it's a little a bit of a hack but maybe this will help you.
1) Reference data in Vue Instance as an external object (data : dataObj)
2) Then in the data return function in the child component just return parentScope = dataObj and voila. Now you cann do things like {{ parentScope.prop }} and will work like a charm.
Good Luck!

I access main properties using $root.
Vue.component("example", {
template: `<div>$root.message</div>`
});
...
<example></example>

A global JS variable (object) can be used to pass data between components. Example: Passing data from Ammlogin.vue to Options.vue. In Ammlogin.vue rspData is set to the response from the server. In Options.vue the response from the server is made available via rspData.
index.html:
<script>
var rspData; // global - transfer data between components
</script>
Ammlogin.vue:
....
export default {
data: function() {return vueData},
methods: {
login: function(event){
event.preventDefault(); // otherwise the page is submitted...
vueData.errortxt = "";
axios.post('http://vueamm...../actions.php', { action: this.$data.action, user: this.$data.user, password: this.$data.password})
.then(function (response) {
vueData.user = '';
vueData.password = '';
// activate v-link via JS click...
// JSON.parse is not needed because it is already an object
if (response.data.result === "ok") {
rspData = response.data; // set global rspData
document.getElementById("loginid").click();
} else {
vueData.errortxt = "Felaktig avändare eller lösenord!"
}
})
.catch(function (error) {
// Wu oh! Something went wrong
vueData.errortxt = error.message;
});
},
....
Options.vue:
<template>
<main-layout>
<p>Alternativ</p>
<p>Resultat: {{rspData.result}}</p>
<p>Meddelande: {{rspData.data}}</p>
<v-link href='/'>Logga ut</v-link>
</main-layout>
</template>
<script>
import MainLayout from '../layouts/Main.vue'
import VLink from '../components/VLink.vue'
var optData = { rspData: rspData}; // rspData is global
export default {
data: function() {return optData},
components: {
MainLayout,
VLink
}
}
</script>