I chose Vue.js over React and Angular, because it felt much more easier to migrate my existing website (old technologies, ASP.NET Razor Pages inside Visual Studio and no npm) to new technologies.
Everything went great. I changed small portions of my website into Vue applications. For example:
Mini cart viewer
Comment form
Rating
Add to cart button
Dynamic forms
However, now that I want to show a dynamic form inside a modal dialog, things don't work.
The point is, modal dialog is a Vue application, and the dynamic form is also another Vue application. So, basically what I do is to load a Vue application inside another Vue application.
Here's my code for modal:
var modalAppJson = {
data() {
return {
isShown: false
}
},
methods: {
show: function (data) {
var _this = this;
_this.isShown = true;
},
hide: function () {
var _this = this;
_this.isShown = false;
}
}
};
var modalApp = Vue.createApp(modalAppJson);
modalApp.config.globalProperties.app = app;
modalApp.mount('.modalInstance');
And here's my code for dynamic form (Vue.js inside Razor Pages):
formApp = {
data() {
return {
form: {
},
fields: []
}
},
methods: {
addField(key, value, isValid) {
var field;
for (var i = 0; i < this.fields.length; i++) {
if (this.fields[i].key === key) {
field = this.fields[i];
}
}
if (!field) {
field = { key: key, value: value, isValid: isValid };
this.fields.push(field);
}
field.value = value;
field.isValid = isValid;
},
removeField: function () {
},
send() {
var form = $('##(Model.Key)Form');
var loader = $('##Model.LoaderKey');
var results = $('##Model.ResultsKey');
var submitButton = $('#submit_#Model.Key');
submitButton.hide();
loader.show();
results.text('');
app.postJson('action=SaveForm&formKey=#Model.Key', JSON.parse(JSON.stringify(this.form)), function (data) {
submitButton.show();
loader.hide();
results.text('Form is saved successfully');
results.addClass('success');
form[0].reset();
}, function (error) {
submitButton.show();
loader.hide();
results.text(error);
results.addClass('error');
});
}
},
computed: {
isValid: function () {
var result = true;
for (var i = 0; i < this.fields.length; i++) {
if (this.fields[i].isValid === false) {
result = false;
break;
}
}
return result;
}
}
};
Vue.createApp(formApp).mount('##(Model.Key)Form');
And here's an example of HTML for these two apps:
<div class="modalInstance">
<div>
Purchase
</div>
<Transition>
<div v-if="isShown">
<form novalidate id="#(Model.FormKey)Form" class="formInstance">
<h1 class="title">#Html.Raw(Model.DatabaseForm.Title)</h1>
<h3 class="shortDescription">#Html.Raw(Model.DatabaseForm.ShortDescription)</h3>
#if (hasFieldsRenderer)
{
<partial name="/Pages/Form/#(pascalizedKey)FieldsRenderer.cshtml" model='#Model.Fields' />
}
else
{
foreach (var field in Model.Fields)
{
<partial name="/Pages/Fields/#(field.RelatedItems.TypeKey).cshtml" model='field' />
}
}
<div class="actions">
<partial name="#Actions.Save" model='new ActionParameters { Classes="submit button", FormKey=Model.FormKey, Text="Save" }' />
<span id="#(Model.FormKey)Loader" style="display: none;">Saving...</span>
<span id="#(Model.FormKey)Result"></span>
</div>
</form>
</div>
</Transition>
</div>
The top-level <div> is controlled by the modal Vue application, and the <form> element is controlled by the dynamic form Vue application.
However I see this error when I open the dialog:
[Vue warn]: Property "form" was accessed during render but is not defined on instance.
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'Name')
This works if I show the form in the page and not in a modal. But breaks when I put it inside modal.
What can I do to solve this?
Related
I have a snippet below which is essentially my entire code block at this point, and essentially it creates a div and when you click "add another zone" it will clone that div. This allows the user to enter multiple lines of info and each have their own result and image.
The issue is that I'm successfully cloning everything with it's own unique identity thanks to my card setup. However, dropzone is not replicating. The first file dropzone form will work perfectly, but when I clone the div and have 2 or more dropzone insnstances on the page they don't work (they don't show the upload image text or anything)
How can I successfully apply my same logic to the dropzone instance here?
new Vue({
components: {},
el: "#commonNameDiv",
data() {
return {
searchString: [''],
results: [],
savedAttributes: [],
cards: [],
showList: false,
zoneNumber:[],
imageZoneNames: [] }
},
methods: {
autoComplete(ev, card) {
this.results = [];
console.log(this.searchString);
if (ev.target.value.length > 2) {
axios.get('/product/parts/components/search', {
params: {
searchString: ev.target.value
}
}).then(response => {
card.results = response.data;
this.showList = true;
console.log(this.results);
console.log(this.searchString);
});
}
},
saveAttribute(result, card) {
card.value = result.attribute_value;
card.results = [];
card.zone = this.zoneNumber;
this.showList = false;
},
addCard: function() {
this.cards.push({
index: "",
value: "",
zoneNumber: "",
results: [],
componentImage:""
});
console.log(this.cards);
},
hideDropdown() {
this.showList = false;
},
},
created() {
this.addCard();
let instance = this;
Dropzone.options = {
maxFilesize: 12,
renameFile: function (file) {
var dt = new Date();
var time = dt.getTime();
return time + file.name;
},
acceptedFiles: ".jpeg,.jpg,.png,.gif",
addRemoveLinks: true,
timeout: 50000,
removedfile: function (file) {
console.log(file.upload.filename);
var name = file.upload.filename;
var fileRef;
return (fileRef = file.previewElement) != null ?
fileRef.parentNode.removeChild(file.previewElement) : void 0;
},
init: function() {
this.on("addedfile",
function(file) {
instance.imageZoneNames.push({name: file.upload.filename, desc: 'Line Drawing'});
console.log(file);
console.log(instance.imageZoneNames);
});
}
};
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"> </script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.5.0/dropzone.js"></script>
<div id="commonNameDiv">
<div class="uk-grid" v-for="(card, i) in cards" :key="i">
<div class="uk-width-1-10" >
<input v-model=" card.zoneNumber" size="4" type="text" name="mapNumber">
</div>
<div class="uk-width-6-10">
<input
style="width:100%"
placeholder="what are you looking for?"
v-model="card.value"
v-on:keyup="autoComplete($event, card)"
>
<div v-if="showList" class="panel-footer componentList" v-if="card.results.length">
<ul>
<li v-for="(result, i) in card.results" :key="i">
<a v-on:click="saveAttribute(result, card)">#{{ result.attribute_value }}</a>
</li>
</ul>
</div>
</div>
<div class="uk-width-3-10">
<form method="post" action="{{url('product/parts/upload/store')}}" enctype="multipart/form-data"
class="dropzone">
</form>
</div>
</div>
<div style="height: 35px;">
</div>
<div>
<a v-on:click="addCard">Add another zone</a>
</div>
</div>
When you instantiate the Dropzone class, it automatically looks for elements to transform in dropzones (by default, elements with the .dropzone class).
It looks like you want to dynamically add elements that are dropzones. Then you need to trigger the dropzone transformation yourself.
I would suggest you disable the autoDiscover option, and manually designates each element you want to transform into dropzones :
addCard() {
this.cards.push({
...
});
let cardIndex = this.cards.length - 1;
// Waiting for the element #dropzone-X to exist in DOM
Vue.nextTick(function () {
new Dropzone("#dropzone-"+cardIndex, {
...
});
});
},
created() {
...
Dropzone.autoDiscover = false
// no new Dropzone()
...
// Starting setup
this.addCard();
},
<form ... class="dropzone" v-bind:id="'dropzone-'+i">
Working jsbin
There are several ways to select the element to transform ($refs, ids, classes), here I'm suggesting ids.
See the doc on programmatically creating dropzones
Actually it is being created, but the Dropzone is not being reconstructed.
I think you have to create a new instance of the Dropzone.
if you try to insert:
created() {
this.addCard();
var myDropzone = new Dropzone('.dropzone')
let instance = this;
Dropzone.options.myDropzone = {
or even add the options to the addCard method or set a setupDropzones method and add it to the addCard method.
The changes are not reflected in DOM, even when the data is changing properly. Here is a very basic example to demonstrate the issue -
<template>
<input type="text" v-model="username" />
<p>{{error}}</p>
<button #click="saveData">Save</button>
</template>
<script>
export default {
data () {
model.error = ''; // adding a new property
return model; // 'model' is a global variable
}
methods: {
saveData() {
if (!this.username) {
this.error = 'Please enter the username!';
return;
}
// ... other code
}
}
};
</script>
After calling saveData() the error variable contains the message if username is not filled. But it's not showing up in the paragraph.
There is a trick. If I also change the username property when the error variable is changed, the changes are reflected.
You need to return error or Vue doesn't have access to it.
data () {
return {
error: '',
model: model,
};
}
You should be able to achieve what you're trying to do, as long as error and username properties are defined on model for data. I've included a simple snippet below, showing it working. Take a look at Declaring Reactive Properties in the documentation.
var model = {
username: "Default"
};
new Vue({
el: "#app",
data: () => {
model.error = model.error || "";
return model;
},
methods: {
updateError() {
this.error = "Test";
},
updateUsername() {
this.username = "Hello, World!";
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<button type="button" #click="updateError">Update Error</button>
<button type="button" #click="updateUsername">Update Username</button>
<div>Error: {{error}}</div>
<div>UserName: {{username}}</div>
</div>
I have used List.JS before successfully, but this time I'm trying to use it with a Vue.JS rendering of a list from JSON data.
I have a button at the top that when clicked should show only the QB position player.
Unfortunately I just get nothing, all list items are removed and I don't get an error in the console so I'm not sure how to diagnose this.
Could it have something to do with the fact that the list elements aren't prerendered/static html but injected using vue.js?
https://jsfiddle.net/nolaandy/hw2mheem/
HTML/Vue Template
<div id='app'>
<div class="all-players-wrapper" id="all-player-listings">
<button id="filter-qb">QB</button>
<ul class="list">
<li v-for="player in playerJSON">
<div class="player-listing">
<div class="player-left">
<div class="player-name">{{player.firstName}} {{player.lastName}}</div>
<div class="playerPosition">{{ player.Position }}</div>
</div><!-- end player-left -->
<div class="player-right">
<div class="player-grade">GRADE <span>{{player.NFLGrade}}</span></div>
</div> <!--end player-right -->
</div>
</li>
</ul>
</div>
</div>
JS
var vm = new Vue({
el: '#app',
data: {
status: 'Combine Particpants',
playerJSON: []
},
created: function () {
this.loadData();
},
methods: {
loadData: function () {
var self = this;
axios.get('https://s3-us-west-2.amazonaws.com/s.cdpn.io/500458/tiny.json').then(function (response) {
self.playerJSON = response.data
console.log(response.data);
})
.catch(function (error) {
self.status = 'An error occurred - ' + error
});
}
}
});
var options = {
valueNames: [ 'playerPosition' ]
};
var featureList = new List('all-player-listings', options);
$('#filter-qb').click(function() {
featureList.filter(function(item) {
if (item.values().playerPosition == "QB") {
return true;
} else {
return false;
}
});
return false;
});
As you suspected, List.js isn't going to work properly if the DOM changes unpredictably. In this case, axios makes its call and populates the data after the (empty) List has been read into featureList.
Your example would work if you put the list-selecting-and-filtering code in the resolution of the axios call, but that's not going to be a solution that works in a truly dynamic environment.
A custom directive will be called every time the DOM updates, so you can apply your adjustments consistently. Here's a directive to apply a filter using List.js:
directives: {
filteredList(el, binding) {
if (binding.value) {
const options = {
valueNames: ['playerPosition']
};
const featureList = new List(el, options);
featureList.filter((item) => item.values().playerPosition === binding.value);
}
}
}
Apply it like so:
<div class="all-players-wrapper" v-filtered-list="filterValue">
Add the filterValue data item, and have the button set it:
<button id="filter-qb" #click="() => filterValue='QB'">QB</button>
and you're in business.
It's worth noting that you could get the same effect by using a computed to filter the data, and you wouldn't need an external library.
Updated fiddle
I am learning Vuejs and I am stuck. Why can I see the messages get added to the object (in Chrome Vue debugger) yet it is not added to the div that contains the list?
My Vue Component:
<template>
<div id="round-status-message" class="round-status-message">
<div class="row">
<div class="col-xs-12" v-for="sysmessage in sysmessages" v-html="sysmessage.message"></div>
</div>
</div>
</template>
<script>
export default {
props: ['sysmessages'],
methods: {
scrollToTop () {
this.$el.scrollTop = 0
}
}
};
</script>
My Vue instance:
$(document).ready(function()
{
Vue.component('chat-system', require('../components/chat-system.vue'));
var chatSystem = new Vue({
el: '#system-chat',
data: function () {
return {
sysmessages: []
};
},
created() {
this.fetchMessages();
Echo.private(sys_channel)
.listen('SystemMessageSent', (e) => {
this.sysmessages.unshift({
sysmessage: e.message.message,
});
this.processMessage(e);
});
},
methods: {
fetchMessages() {
axios.get(sys_get_route)
.then(response => {
this.sysmessages = response.data;
});
},
processMessage(message) {
this.$nextTick(() => {
this.$refs.sysmessages.scrollToTop();
});
// updateGame();
}
}
});
});
My template call in HTML:
<div id="system-chat">
<chat-system ref="sysmessages" v-on:systemmessagesent="processMessage" :sysmessages="sysmessages" :player="{{ Auth::user() }}"></chat-system>
</div>
There are no compile or run time errors and I can see records added to the props in the vue chrome tool. I can also see empty HTML elements added to the div.
What have I missed?
UPDATE: My record structures:
response.data is an array of objects, each like this:
{"data":[
{"id":100,
"progress_id":5,
"message":"start message",
"action":"welcome"
},
{"id"....
e.message.message contains the text message entry, so just a string.
I am trying to access the message variable in each object during the fetchMessages method.
You're adding objects with sysmessage as the property.
this.sysmessages.unshift({
sysmessage: e.message.message,
});
But you are trying to view
v-for="sysmessage in sysmessages" v-html="sysmessage.message"
Based on your update, the code should be:
this.sysmessages.unshift({
message: e.message.message,
});
And you can leave the template as
v-html="sysmessage.message"
I am relatively new to Vue, so forgive me if this is obvious (or obviously impossible).
I have a set of JSON data (fetched from a RESTful API via vue-resource):
{content: "This is content. <a href='/blog'> Link to blog </a>"}
Right now, the link triggers a page reload. If it were a vue-router v-link, that would not be an issue. However, this doesn't work (quotes are escaped in the data, of course):
{content: "This is content. <a v-link="{ path: '/blog' }"> Link to blog </a>"}
At this point, the template is already parsed, and Vue won't create a v-link anymore (it will just show up as a v-link in the rendered html).
My final result would ideally mean that I could include links in my CMS, either in HTML or Vue format, and have Vue route them correctly as v-links.
Is there something I can do to make Vue interpret the link in the JSON data?
I've answered the question on Vue Chat, and writing it here in case any other people facing similar problem
Simplified example on Codepen
HTML
<div id="app">
<div>
<a v-link= "{path:'/home'}">Go to home</a>
</div>
<router-view></router-view>
</div>
<template id="home">
<div>
<div>
Fetched Content:
</div>
<div>
{{{ fetchedContent }}}
</div>
</div>
</template>
<template id="route1">
<div>
Route1 view
</div>
</template>
<template id="route2">
<div>
Route2 view, this is different from Route1
</div>
</template>
javascript
function getContent (callback) {
var content = 'Click this: Go to route1 and Go to route2'
setTimeout(function () { callback(content) }, 1000)
}
var Home = Vue.component('home',{
template:'#home',
data: function () {
return {
fetchedContent: 'Loading...'
};
},
ready: function () {
var self = this
var router = this.$router
getContent( function (result) {
self.fetchedContent = result;
Vue.nextTick(function () {
var hyperLinks = self.$el.getElementsByTagName('a')
Array.prototype.forEach.call(hyperLinks, function (a) {
a.onclick = function (e) {
e.preventDefault()
router.go({ path: a.getAttribute("href") })
}
})
})
})
}
});
var Route1 = Vue.component('route1', {
template: '#route1'
});
var Route2 = Vue.component('route2', {
template: "#route2"
});
var router = new VueRouter({
hashbang:false,
history:true
});
router.map({
'/home':{
component:Home
},
'/route1':{
component:Route1
},
'/route2':{
component:Route2
}
});
router.start({
}, '#app');
I had a similar solution here: question using a custom dataset in my JSON code and a click listener to process it:
mounted() {
window.addEventListener('click', event => {
let target = event.target
if (target && target.href && target.dataset.url) {
event.preventDefault();
console.log(target.dataset.url);
const url = JSON.parse(target.dataset.url);
console.log(url.name)
this.$router.push(url.name);
}
});
},