When using Vue inline template, I was expecting the following code to render a,b,c in a table. Instead, it renders nothing with no console errors. What am I doing wrong?
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(function() {
app = new Vue({
el: '#app',
data: {
items: ["a", "b", "c"]
}
});
Vue.component('items-component', {
props: ['items'],
computed: {
showTable: function() {
return this.items.length > 0
}
}
})
})
</script>
<div id="app">
<items-component inline-template>
<table v-if="showTable">
<tr v-for="item in items">
<td>{{item}}</td>
</tr>
</table>
</div>
</div>
First, you don't need jQuery wrapper to run your Vue code.
Second, you should specify data in your component, not on constructor.
Third, You are expecting a prop on your items-component to get, but not sending any, you should remove it too. Also data must return an object, and it should be a function
Below, the working one
https://jsfiddle.net/2yyjy3bc/1/
Related
The idea
I'm trying to build a display where activities are shown with some filters. The data comes from an API generated by the CMS. The filters are not shown in the code since its not relevant.
Problem
When manually defining the 'items' in the data property the v-for list rendering displays fine and gives the desired output. When pulling the data from the api and assigning them to items the v-for is not displaying anything.
My Thoughts
I think that the v-for is run before the api request is finished putting the data into the 'items' value. Currently I'm using 'created' property to fire the function, also used 'Mounted()' before, this also didn't work.
Versions Vue 2.6.14, Axios 0.21.1
Vue Code
var vue = new Vue({
el: '#app',
data: {
items: null,
},
created: function () {
this.fetchData()
},
methods: {
fetchData: function() {
axios
.get('/api/activities.json')
.then(response => (this.items = response.data.data))
}
}
})
Templating
<div id="app">
<ul class="example">
<li v-for="item in items">
{{ item }}
</li>
</ul>
</div>
Your code seems to be working just fine. Look below, I just replaced your api call with a dummy REST api call and it's working just fine. Please console out the data from response.data.data and see if you are really receiving an array there.
Vue.config.productionTip = false
Vue.config.devtools = false
let vue = new Vue({
el: '#app',
data: {
items: null,
},
created() {
this.fetchData()
},
methods: {
fetchData: function() {
axios.get('https://jsonplaceholder.typicode.com/users')
.then(response => { this.items = response.data })}
}
})
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div id="app">
<ul class="example">
<li v-for="item in items">
{{ item.id }} - {{ item.name }}
</li>
</ul>
</div>
</div>
We are using Vex in our application for all the dialog messages. I have an input in one of the dialogs that is used to filter a list of items.
In my Vue instance, I want to listen for the changes on a data property.
The problem is that Vue doesn't get the changes as I type them in the input box. I am thinking this is due to the fact that the input is added to the DOM after the Vue initialization.
How would I approach this so my Vue instance can listen to the input changes? I've done my best to recreate the scenario in it's most simple form in the snippet below.
new Vue({
el: '#app',
data: {
filter: ''
},
methods: {
openModal: function() {
vex.dialog.open({
input: [
'<h2>Filter</h2>',
'<input v-model="filter" />',
'<p>{{filter}}</p>'
].join('')
})
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vex-js/4.0.0/js/vex.combined.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/vex-js/4.0.0/css/vex.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<button v-on:click="openModal">Open Modal</button>
</div>
The issue is that you are providing plain html in strings to the vex.dialog.open method. Vue won't have any idea that you have done this and so none of the Vue syntax that you've included in those strings will be interpreted as it would in a Vue component definition.
What you should do is make a Vue component for that input, and then pass that input's element via a ref to the vex.dialog.open method. That way, Vue will have compiled the template before it's used in the dialog.
Here's a simple example:
Vue.component('my-input', {
template: `
<div>
<h2>Filter</h2>
<input v-model="filter"/>
<p>{{filter}}</p>
</div>
`,
data() {
return {
filter: ''
}
}
});
new Vue({
el: '#app',
data() {
return {
modalOpened: false
}
},
methods: {
openModal() {
vex.dialog.open({
input: this.$refs.input.$el
});
this.modalOpened = true;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vex-js/4.0.0/js/vex.combined.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/vex-js/4.0.0/css/vex.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<button #click="openModal">Open Modal</button>
<my-input v-show="modalOpened" ref="input"/>
</div>
I have used data option in two ways. In first snippet data object contains a key value, however, in second data is a function. Is there any benefits of individuals.Not able to find relevant explanations on Vue.js Docs
Here are two code snippets:
new Vue({
el: "#app",
data: {
message: 'hello mr. magoo'
}
});
new Vue({
el: "#app",
data() {
return {
message: 'hello mr. magoo'
}
}
});
Both are giving me the same output.
It seems as though the comments on your question missed a key point when considering your specific code example.
In a root Vue instance i.e. constructed via new Vue({ ... }), you can simply use data: { ... } without any problems. The issue is when you have reusable components that are defined via Vue.component(...). In these instances, you need to either use data() {return { ... };} or data: function() {return { ... };}.
The reason for this is to ensure that for each individual instance of the reusable child component, there is a unique object containing all of the data being operated on. If, in a child component, you instead use data: { ... }, that same data object will be shared between the child components which can cause some nasty bugs.
Please review the corresponding section of the Vue.js documentation for more information regarding this problem.
[Vue warn]: The "data" option should be a function that returns a per-instance value in component definitions.
so initiating a new vue instance dose not matter between data:{} as a object or data(){return{}} or data:function(){return{}}.
It matters when it comes to component lets try an example:
<body>
<div id="app">
<counter></counter>
<counter></counter>
</div>
<script>
Vue.component('counter', {
template: '<button v-on:click="counter += 1">{{ counter }}</button>',
data: {
counter:0
}
});
</script>
Output:
[Vue warn]: The "data" option should be a function that returns a per-instance value in component definitions.
Now lets watch in vue object:
<body>
<div id="app">
<button v-on:click="counter += 1">{{ counter }}</button>
<button v-on:click="counter += 1">{{ counter }}</button>
</div>
<script>
new Vue({
el: '#app',
/*data() {
return {
counter:0
}
},*/
//or (output same)
/*data: function () {
return {
counter: 0
}
}*/
//or (output same)
data:{
counter:0
}
});
</script>
</body>
//Now let's try data as a function in the component to reuse same component over and over again.
<body>
<div id="app">
<counter></counter>
<counter></counter>
<counter></counter>
</div>
<script>
Vue.component('counter', {
template: '<button v-on:click="counter += 1">{{ counter }}</button>',
data: function () {
return {
counter: 0
}
}
})
new Vue({
el: '#app'
});
</script>
</body>
I'm fairly new to VUE.JS and I'm trying to integrate it into an MVC project.
In my MVC view I have my app div.
#RenderPage("~/Views/Product/Templates/product-details-template.cshtml")
<div id="app">
<product-details-component></product-details-component>
</div>
The component is rendering fine and fetching the database for data which also works fine.
<template id="product-details-container">
<div class="wrapper">
<div class="container-body">
<div class="container-header">
<h1>3 Year Discount</h1>
<span class="details"><i class="fa fa-long-arrow-left"></i> Back to Product Details</span>
</div>
<div class="container-table">
<table class="table-product-details">
<tr>
<td on:click="UpdateProduct" class="table-title spaceUnder">Description: </td>
<td class="table-value spaceUnder">{{ description }}</td>
<td class="table-title spaceUnder">Product Code: </td>
<td class="table-value spaceUnder">{{ code }}</td>
<td class="table-title spaceUnder">Scheme Code: </td>
<td class="table-value spaceUnder">{{ schemecode }}</td>
</tr>
But when I'm trying to fire an event / change the data of vm from the component it simply doesn't work.
Here is the actual js I removed the props from the component and a lot of data from the vm for better readability.
Vue.component('product-details-component', {
template: '#product-details-container'
});
var vm = new Vue({
el: '#app',
data: {
show: true
},
beforeMount() {
this.UpdateProduct();
},
methods: {
UpdateProduct: function() {
axios.get('myapiurl' + this.productId)
.then(function(response) {
var data = response.data;
// assigning data to the vm
});
},
When i try to run the application it just crashes and in the console it says "UpdateProduct is not defined".
Right Im not sure maybe the problem is because #RenderPage is running before the javascript and trying to attach the event to a method that doesn't exist at that time, but then why would my attribute bindig work? {{ description }} is working fine. I removed the code when I assign value to description and etc but it doesn't matter in this case. Any suggestions?
It's not the parenthesis but the lack of proper tagging.
it should be
<td v-on:click="UpdateProduct" class="table-title spaceUnder">Description: </td>
Vue properties all start with v- except in cases of the shorthand which in this case could be #click="UpdateProduct"
You have missed parenthesis in HTML, it should be like following:
<td on:click="UpdateProduct()" class="table-title spaceUnder">Description: </td>
Right I have managed to make it work.
I added methods options to the component itself, and from there I can call the app's method.
Vue.component('product-details-component', {
template: '#product-details-container',
methods: {
CallMethod: function(){
return vm.MethodIwantToCall();
}
}
var vm = new Vue({ ....
methods: {
MethodIwantToCall () => ...
}
You are missing something.
Your component should have the click method, so yo should add the click into your template and then call to vue app.
Vue.component('product-details-component', {
template: '#product-details-container',
methods:{
UpdateProduct: function() {
//Here you are calling your real method from the template
vm.UpdateProduct();
}
}
});
change #click to ##click
<div id="app">
<button ##click="count++">{{ count }}</button>
</div>
<script type="module">
import { createApp } from 'vue'
const app = createApp({
data() {
return {
count: 0
}
}
})
app.mount('#app')
</script>
So here is my problem:
I want to make a component that takes it's values from v-with="values" and add them to my component model after some modification, then display those modified properties.
But from what I understand, when I set values with "v-with", component data are erased so the binding between my component data (not v-with one) and my directives are lost.
I'm really new to this framework, I don't see any solution, so I guess it was time to ask my first question here !
Here is the HTML:
<script type="text/x-template" id="my-template">
<p v-on="click:reloadParentMsg">Msg parent : {{ParentMsg}}</p>
<p v-on="click:reloadChildMsg">Msg child : {{ChildMsg}}</p>
</script>
<div id="myVue">
<my-component v-with="ParentData" ></my-component>
</div>
And here is the Javascript:
Vue.component('my-component', {
template: '#my-template',
data: function () {
return {
ChildMsg: "wololo"
}
},
methods:{
reloadParentMsg : function(){
this.ParentMsg="Parent";
console.log(this.ParentMsg);
},
reloadChildMsg : function(){
this.ChildMsg="Child";
console.log(this.ChildMsg);
}
}
})
var myVue = new Vue({
el: '#myVue',
data: {
ParentData:{ParentMsg: "gloubiboulga"}
}
})
And the js fiddle http://jsfiddle.net/KwakawK/hfj1tv4n/3/
I'm not totally clear on what you're trying to do, but I believe it can be solved by using the second form of v-with, which is v-with="childProp: parentProp". Rather than the parent property overriding all of the child data, this will replace only the property on the left of the colon.
So I think your code can be fixed by changing the v-with to this:
<my-component v-with="ParentMsg: ParentData.ParentMsg" ></my-component>
Here's the updated code as a snippet:
// register the grid component
Vue.component('my-component', {
template: '#my-template',
data: function () {
return {
ChildMsg: "wololo"
}
},
methods:{
reloadParentMsg : function(){
this.ParentMsg="Parent";
console.log(this.ParentMsg);
},
reloadChildMsg : function(){
this.ChildMsg="Child";
console.log(this.ChildMsg);
}
}
})
// bootstrap the demo
var myVue = new Vue({
el: '#myVue',
data: {
ParentData:{ParentMsg: "gloubiboulga"}
}
})
<script src="http://cdnjs.cloudflare.com/ajax/libs/vue/0.11.4/vue.min.js"></script>
<script type="text/x-template" id="my-template">
<p v-on="click:reloadParentMsg">Msg parent : {{ParentMsg}}</p>
<p v-on="click:reloadChildMsg">Msg child : {{ChildMsg}}</p>
</script>
<div id="myVue">
<my-component v-with="ParentMsg: ParentData.ParentMsg" ></my-component>
</div>
See the Vue guide for more information.