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Unable to set VueJs Component data values from component prop

For some reason, the value for customer_data.customerReference is never available yet I can see using Chrome debugging tools that the data exists in the prop and is successfully passed from my app down to the component.
Vue.component("mycomponent", {
template: '#my-component-template',
props: ["customer_data"],
data() {
return {
myData: 'This works fine!',
form_data: {
customerRef: this.customer_data.customerReference
}
}
}
});
new Vue({
el: "#app",
data() {
return {
customer: {
customerReference: 007
}
};
}
});
Here is my markup including the template:
<div id="app">
<mycomponent customer_data="customer" />
</div>
<script type="x-template" id="my-component-template">
<div>
<p>{{form_data.customerRef}}</p>
<p>{{myData}}</p>
</div>
</script>
Please see the following JsFiddle with a simplified example:
https://jsfiddle.net/ProNotion/a8c6nqsg/20/
What is that I am missing here or implementing incorrectly?

You should bind it using v-bind: or just :
<div id="app">
<mycomponent :customer_data="customer" />
</div>
https://v2.vuejs.org/v2/guide/components-props.html

You're passing in a string that says 'customer' and not the actual customer object. All you need to do is change customer_data="customer" to v-bind:customer_data="customer"

VueJS 2 show some HTML if a Function prop was passed

Question
In VueJS 2 how do you show some HTML if a Function prop was passed to the component.
Example
<template>
<div v-if="backBtn" #click="$emit('backBtn')">Back Button</div>
</template>
<script>
export default {
props: {
backBtn: Function
}
}
</script>
I can do this by passing a separate prop to key the v-if off of but I'm trying to do this will the one prop.
I created a Fiddle for this issue here

that should work,
you can add more definition with !== undefined
<template>
<div v-if="backBtn !== undefined" #click="$emit('backBtn')">Back Button</div>
</template>
<script>
export default {
props: {
backBtn: {
type: Function,
},
}
}
</script>
but as mentioned, that should work already, so you error may be somewhere else.
after seeing your code, I see what the issue is. it's a case issue
use :back-btn instead of :backBtn
this happens only if you're using vue runtime only (without the compilation)
read more here:
https://v2.vuejs.org/v2/guide/installation.html#Runtime-Compiler-vs-Runtime-only
you can solve it also by passing the function only
https://jsfiddle.net/rz6hyd7b/7/
Vue.component('my-btn', {
props: {
backbtn: {
type: Function
}
},
template: `
<div>
<div v-if="backbtn" #click="backbtn">Back Button</div>
</div>
`
})
var vm = new Vue({
el: '#app',
components: 'my-btn',
methods: {
btnClicked: function(){
console.log('adsf')
}
},
template: `
<div>
Show Btn => <my-btn :backbtn="btnClicked"></my-btn>
</br>
Hidden Btn => <my-btn></my-btn>
</div>
`
});

Vue.js 2 component not displaying data

I'm trying to make a simple vue component work:
<div id="app">
<my-component></my-component>
</div>
<script>
Vue.component('my-component', {
template: '<div>A custom component! {{ xstr }} aa</div>',
data: function() {
return {
xstr: 'i really want this to be visible',
};
}
});
window.app = new Vue({
el: '#app',
});
</script>
But apparently xstr is not displayed. What am I missing?

I identified my issue, but it's not related to vue. I used jinja2 for generating the html, and since jinja uses the {{ }} syntax for templating as well, the two systems interfered.

VueJS Passing data Through render

I'm currently working with VueJS 2, I would like to pass some params from the HTML to the VueJS component. Let me show you.
My Html Div looks like this :
<div id="app" :id="1"></div>
And my javascript :
new Vue({
store, // inject store to all children
el: '#app',
render: h => h(App)
});
My App Component:
<template>
<div>
{{ id }}
</div>
</template>
<script>
export default {
props: {
id: Number
}
}
</script>
I would like to get the id passed in the Html, in my App component.
How should I do ?

Here is one way.
<div id="app" data-initial-value="125"></div>
new Vue({
el: '#app',
render: h => h(App, {
props:{
id: document.querySelector("#app").dataset.initialValue
}
})
})
But you don't have to use a render function.
new Vue({
el: '#app',
template:"<app :id='id'></app>",
data:{
id: document.querySelector("#app").dataset.initialValue
},
components:{
App
}
})
Also, I'm using querySelector assuming you rendered initialValue (instead of id) to the page as an attribute, but you could just as easily put it somewhere else on the page like a hidden input or something. Really doesn't matter.

Vue instance inside Vue instance

Sup people!
I got this HTML code here:
// index.html
<div data-init="component-one">
<...>
<div data-init="component-two">
<button #click="doSomething($event)">
</div>
</div>
This basically references a Vue instance inside another Vue instance if I understood everything correctly. The respective JS code is split up in two files and looks like this:
// componentOne.js
new Vue(
el: '[data-init="component-one"]',
data: {...},
methods: {...}
);
// componentTwo.js
new Vue(
el: '[data-init="component-two"]'
data: {...}
methods: {
doSomething: function(event) {...}
}
);
Now, the problem with this is, that doSomething from componentTwo never gets called.
But when I do some inline stuff, like {{ 3 + 3 }}, it gets computed like it should. So Vue knows there is something. And it also removes the #click element on page load.
I tried fiddling around with inline-template as well, but it doesn't really work as I'd expect it to in this situation. And I figured it isn't meant for this case anyway, so I dropped it again.
What would the correct approach be here? And how can I make this work the easiest way possible with how it's set up right now?
The Vue version we use is 2.1.8.
Cheers!

The problem is that you have two vue instances nested to each other.
If the elements are nested, then you should use the same instance or try components
https://jsfiddle.net/p16y2g16/1/
// componentTwo.js
var item = Vue.component('item',({
name:'item',
template:'<button #click="doSomething($event)">{{ message2 }</button>',
data: function(){
return{
message2: 'ddddddddddd!'
}},
methods: {
doSomething: function(event) {alert('s')}
}
}));
var app = new Vue({
el: '[data-init="component-one"]',
data: {
message: 'Hello Vue!'
}
});
<div data-init="component-one">
<button >{{ message }}</button>
<item></item>
</div>
Separate instances work if they are independant of each other.
as follows:
https://jsfiddle.net/p16y2g16/
var app = new Vue({
el: '[data-init="component-one"]',
data: {
message: 'Hello Vue!'
}
});
// componentTwo.js
var ddd = new Vue({
el: '[data-init="component-two"]',
data: {
message: 'ddddddddddd!'
},
methods: {
doSomething: function(event) {alert('s')}
}
});

But when I do some inline stuff, like {{ 3 + 3 }}, it gets computed like it should. So Vue knows there is something.
Because you have parent instance 'componentOne'. It activated Vue for this template. If you need to set another instance inside, you have to separate part of template. Example (it can lag in snippet!) .
Alternative
https://jsfiddle.net/qh8a8ebg/2/
// componentOne.js
new Vue({
el: '[data-init="component-one"]',
data: {
text: 'first'
},
methods: {}
});
// componentTwo.js
new Vue({
el: '[data-init="component-two"]',
data: {
text: 'second'
},
template: `<button #click="doSomething($event)">{{text}}</button>`,
methods: {
doSomething: function(event) {
console.log(event);
}
}
});
<script src="https://vuejs.org/js/vue.min.js"></script>
<div data-init="component-one">
{{text}}
</div>
<div data-init="component-two">
</div>

The button element inside component-two is referenced as a slot in Vue.
The evaluation of the #click directive value happens in the parent component (component-one, which host component-two). Therefor, you need to declare the click handler over there (over component-one).
If you want the handler to be handled inside component-two, you should declare a click directive for the slot element in it's (component-two) template, and pass the handler function, for instance, as a pop.
good luck.

You're doing everything right except you've nested the 2nd Vue instance inside the 1st. Just put it to the side and it will work as expected.
Vue ignores binding more than once to the same element to avoid infinite loops, which is the only reason it doesn't work nested.

Use vue-cli to create a webpack starter app. vue init app --webpack
Then, try to structure your components this way. Read more: https://v2.vuejs.org/v2/guide/components.html#What-are-Components
This is main.js
import Vue from 'vue'
import ComponentOne from './ComponentOne.vue'
import ComponentTwo from './ComponentTwo.vue'
new Vue({
el: '#app',
template: '<App/>',
components: {
ComponentOne,
ComponentTwo
}
})
This is ComponentOne.vue
<template>
<div class="user">
<div v-for="user in users">
<p>Username: {{ user.username }}</p>
</div>
</div>
</template>
<script>
export default {
data () {
return {
users: [
{username: 'Bryan'},
{username: 'Gwen'},
{username: 'Gabriel'}
]
}
}
}
</script>
This is ComponentTwo.vue
<template>
<div class="two">
Hello World
</div>
</template>
<script>
export default {
}
</script>

<div th:if="${msg.replyFloor}">
<div class="msg-lists-item-left">
<span class="msg-left-edit"
th:classappend=" ${msg.unreadCount == 0} ? 'msg-all-read' ">您在</span>
<span th:text="${msg.topic.title}"
class="msg-left-edit-res"
th:classappend=" ${msg.unreadCount == 0} ? 'msg-all-read' ">问题回答</span>
<span th:text="${msg.type.name}"
class="msg-left-edit "
th:classappend=" ${msg.unreadCount == 0} ? 'msg-all-read' ">帖子相关</span>
<span class="msg-left-edit-number" >
产生了<span th:text="${msg.unreadCount} ? : ${msg.unreadCount} + '条新' : ${msg.unreadCount} + '条' "
th:class="${msg.unreadCount} ? : 'number-inner':''">2132条</span>回复
</span>
</div>
<div class="msg-lists-item-right">
<span th:text="${msg.lastShowTime}">2017-8-10</span>
</div>
</div>