Consider this:
<div id="app">
<test-component to="abc">Some ABC</test-component>
<test-component to="xyz">Some XYZ</test-component>
<test-component to="123">Some 123</test-component>
</div>
----
Vue.component('test-component', {
template: '<a :href="to"> <slot></slot> </a>',
props: ['to'],
});
new Vue({
el: "#app",
})
All three "test-components" are rendered as expected. See https://jsfiddle.net/gotp1fdL/1/
However, when I implement a wrapper App component, only the first "test-component" is rendered and the others are even disregarded...
See https://jsfiddle.net/gsxq9ajc/
<div id="app">
<app></app>
</div>
<template id="application">
<test-component to="abc">Some ABC</test-component>
<test-component to="xyz">Some XYZ</test-component>
<test-component to="123">Some 123</test-component>
</template>
---
Vue.component('test-component', {
template: '<a :href="to"> <slot></slot> </a>',
props: ['to'],
});
Vue.component('app', {
template: '#application',
});
new Vue({
el: "#app",
})
Please could someone explain why? What is missing to have all components rendered isolated, without issues?
The problem is the following, as shown in the console:
vue.js:634 [Vue warn]: Error compiling template:
Component template should contain exactly one root element. If you are
using v-if on multiple elements, use v-else-if to chain them instead.
Adding a wrapper in you app component will fix it.
<template id="application">
<div>
<test-component to="abc">Some ABC</test-component>
<test-component to="xyz">Some XYZ</test-component>
<test-component to="123">Some 123</test-component>
</div>
</template>
Related
I would like to load a component into a slot only if the slot exists (because I don't want to waste resources creating and mounting the component).
So I did it like that:
Test.vue
<slot :load="true" name="slotNo1"/
Wrapper.vue
<template slot="slotNo1" slot-scope="{ load }"> <Test v-if="load" /> </template>
But I wonder if there is an easier way without having to create the "load" variable.
Refer this
Vue.component('Custom', {
template: `
<div>
<span>always displayed</span>
<strong v-if="hasSlotData">
displayed only when slot passed: <slot></slot>
</strong>
</div>
`,
computed: {
hasSlotData() {
return this.$slots.default;
}
}
});
new Vue({
el: '#root'
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="root">
<custom></custom>
<custom>content</custom>
</div>
If you wanna control parent, this may help you https://michaelnthiessen.com/advanced-vue-controlling-parent-slots
Here is a strange issue i am facing.
<script src="https://unpkg.com/vue#2.6.11/dist/vue.min.js"></script>
<div id="app">
<transition-group name="fadeLeft" tag="ul">
<section key="0">
<testt></testt>
<template v-pre id="myId">
<div>My neighbors: <a v-for="(val,index) in myArray">{{val}}</a></div>
</template>
</section>
</transition-group>
</div>
<script>
Vue.component('testt', {
template: '#myId',
props: {
myArray: {
type: Array,
default: function() {
return ['James', 'Mike'];
}
}
}
})
new Vue({
el: '#app'
})
</script>
transition-group renders the component twice (and the second rendering is done without parsed "{{variable}}").
If you just remove transition-group parent at all, it works as expected and there is no duplicated content. So, definitely the problem seems somewhere there. How to fix that (so, retain transition-group and solve the problem)
Please don't post answers "use component outside of app" or similar offtopic, i described the problem I need to find answer. Also, the aprior is that the template needs to be within transition-group decendants.
The problem:
In the section tack you have the testt tag which was rendered with the parsed HTML and also the template which was rendered as another literal tag (no rendering). And since transition-group elements must be keyed, the template had to be moved out.
The solution:
<script src="https://unpkg.com/vue"></script>
<div id="app">
<transition-group name="fadeLeft" tag="ul">
<section key="0">
<testt></testt>
</section>
</transition-group>
<template v-pre id="myId">
<div>My neighbors: <a v-for="(val,index) in myArray">{{val}} </a></div>
</template>
</div>
<script>
Vue.component('testt', {
template: '#myId',
props: {
myArray : { type:Array, default :function(){ return ['James','Mike'];} }
}
})
new Vue({
el: '#app'
})
</script>
I am new to Vue. When I use v-if, v-else-if, and v-else, the first two tags work well. But for v-else, it only change the context in {{}}.
html:
<div id="app">
<div v-if="isIf === 1">
isIf is 1：{{isIf}}
</div>
<div v-else-if="2">
isIf is 2：{{isIf}}
</div>
<div v-else>
isIf is not 1 or 2：{{isIf}}
</div>
</div>
js:
<script>
var app = new Vue({
el: '#app',
data: {
isIf: 1,
isShow: false
}
});
</script>
when I change the app.isIf=3 in console, it showed isIf is 2: 3. My last try is app.isIf=2, so it showed the context with last input. Any idea?
Your v-else-if condition is wrong - instead of
<div v-else-if="2">
it should be
<div v-else-if="isIf === 2">
Except for zero, any numerical value will be considered "true" in Javascripts. So your render logic is always around "v-if" and "v-else-if", it never reaches "v-else"
I want to replace my project's first piece of vanilla JS with vue.
I try to get the hello world example working.
It works as stated, but when I nest the element in another element (these may be the wrong terms) it does not work.
My source code:
<!-- this works -->
<div id="app">
<p>${ message }</p>
</div>
<!-- but this doesn't for some reason -->
<div class="container">
<div id="app">
Nested ${ message }
</div>
</div>
Full code example.
The class="container" is needed for bootstrap.
EDIT:
I took the generated html and edited it down to just the bare minimum to show it not working.
See the result.
Wrap the container with
<div id="app"></div>
It should work that way
this works fine, the problem in your template is that you have two elements with id="app" so vue instance is initialized with the first element with id="app", then the second (the nested one) is never initialized
<html>
<head>
<script src="https://unpkg.com/vue"></script>
</head>
<body>
<!-- but this doesn't for some reason -->
<div class="container">
<div id="app">
Nested ${ message }
</div>
</div>
<script>
new Vue({
delimiters:['${', '}'],
el: '#app',
data: {
message: 'Hello Vue.js!'
}
})
</script>
</body>
</html>
You have 2 #app id but one vue instance. If you need two #app you should make two Vue instance. Instance 1 for #app1 and instance 2 for #app2. You can save theme in variables if you need to interact within theme:
<div id="app1">
<p>${ message }</p>
</div>
<div class="container">
<div id="app2">
Nested ${ message }
</div>
</div>
<script>
var app1 = new Vue({
delimiters:['${', '}'],
el: '#app1',
data: {
message: 'Hello Vue.js!'
}
});
var app2 = new Vue({
delimiters:['${', '}'],
el: '#app2',
data: {
message: 'Hello Vue.js!'
}
})
</script>
if this answer helped you, consider to accept it.
I'm trying to create a component, that can show/hide on click, similar to an accordion.
I have the following error and I don't know why:
[Vue warn]: Property or method "is_open" is not defined on the
instance but referenced during render. Make sure to declare reactive
data properties in the data option. (found in root instance)
<div id="app">
<div is="m-panel" v-show="is_open"></div>
<div is="m-panel" v-show="is_open"></div>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script src="comp_a.js" ></script>
<!--<script src="app.js" ></script>-->
</html>
Vue.component('m-panel', {
data: function() {
return {
is_open: true
}
},
template: '<p>Lorem Ipsum</p>'
})
new Vue({
el:'#app',
})
Your code seems a little confused, your is_open is in your component but you are trying to access it in the parent. You just need to make sure this logic is contained inside your component. The easiest way is to simply place an event on the relevant element in your component template:
<template>
<div>
<!-- Toggle when button is clicked-->
<button #click="is_open=!is_open">
Open Me!
</button>
<span v-show="is_open">
I'm Open!
</span>
</div>
</template>
Here's the JSFiddle: https://jsfiddle.net/ytw22k3w/
Because u used is_open property in '#app instance' but u didnt declare in it,u decladed in 'm-panel component' which has no relation with it.Try something like this can avoid it.
new Vue({
el:'#app',
data:{
is_open:''
}
})