I'm trying to set a toggle as open by default in Vue.js, however I'm not really sure where I should use Boolean. Where should I put Boolean "true" or "false"? in Vue.js? In script tag, I'm not sure how I can write Boolean in this code.
In data define boolean 'openMenu'
data: function() {
return {
openMenu : false,
}
}
In HTML
<div id="nav-content" v-show="openMenu">
In method toggle that using SideBarToggle function
methods: {
sideBarToggle(){
this.openMenu = !this.openMenu
}
}
Or toggle from template HTML also
<div class="mouseover nav-toggle" #click="openMenu != openMenu">
Related
So from the backend I get a array of objects that look kind of like this
ItemsToAdd
{
Page: MemberPage
Feature: Search
Text: "Something to explain said feature"
}
So i match these values to enums in the frontend and then on for example the memberpage i do this check
private get itemsForPageFeatures(): ItemsToAdd[] {
return this.items.filter(
(f) =>
f.page== Pages.MemberPage &&
f.feature != null
);
}
What we get from the backend will change a lot over time and is only the same for weeks at most. So I would like to avoid to have to add the components in the template as it will become dead code fast and will become a huge thing to have to just go around and delete dead code. So preferably i would like to add it using a function and then for example for the search feature i would have a ref on the parent like
<SearchBox :ref="Features.Search" />
and in code just add elements where the ItemsToAdd objects Feature property match the ref
is this possible in Vue? things like appendChild and so on doesn't work in Vue but that is the closest thing i can think of to kind of what I want. This function would basically just loop through the itemsForPageFeatures and add the features belonging to the page it is run on.
For another example how the template looks
<template>
<div class="container-fluid mt-3">
<div
class="d-flex flex-row justify-content-between flex-wrap align-items-center"
>
<div class="d-align-self-end">
<SearchBox :ref="Features.Search" />
</div>
</div>
<MessagesFilter
:ref="Features.MessagesFilter"
/>
<DataChart
:ref="Features.DataChart"
/>
So say we got an answer from backend where it contains an object that has a feature property DataChart and another one with Search so now i would want components to be added under the DataChart component and the SearchBox component but not the messagesFilter one as we didnt get that from the backend. But then next week we change in backend so we no longer want to display the Search feature component under searchbox. so we only get the object with DataChart so then it should only render the DataChart one. So the solution would have to work without having to make changes to the frontend everytime we change what we want to display as the backend will only be database configs that dont require releases.
Closest i can come up with is this function that does not work for Vue as appendChild doesnt work there but to help with kind of what i imagine. So the component to be generated is known and will always be the same type of component. It is where it is to be placed that is the dynamic part.
private showTextBoxes() {
this.itemsForPageFeatures.forEach((element) => {
let el = this.$createElement(NewMinorFeatureTextBox, {
props: {
item: element,
},
});
var ref = `${element.feature}`
this.$refs.ref.appendChild(el);
});
}
You can use dynamic components for it. use it like this:
<component v-for="item in itemsForPageFeatures" :is="getComponent(item.Feature)" :key="item.Feature"/>
also inside your script:
export default {
data() {
return {
items: [
{
Page: "MemberPage",
Feature: "Search",
Text: "Something to explain said feature"
}
]
};
},
computed: {
itemsForPageFeatures() {
return this.items.filter(
f =>
f.Page === "MemberPage" &&
f.Feature != null
);
}
},
methods: {
getComponent(feature) {
switch (feature) {
case "Search":
return "search-box";
default:
return "";
}
}
}
};
I have the following code in a Nuxtjs app in SSR mode.
<Component
:is="author.linkUrl ? 'a' : 'div'"
v-bind="!author.linkUrl && { href: author.linkUrl, target: '_blank' }"
#click="author.linkUrl ? handleAnalytics() : null"
>
The click event in case it's an a tag, will only fire if it's written as handleAnalytics(), but handleAnalytics will not work.
Don't get me wrong the code is working, but I don't understand why.
With classical event binding (#click="handleAnalytics), Vue will auto bind it for you because it sees it's a function.
But when provided a ternary condition, it's not auto binded but wrapped into a anonymous function instead. So you have to call it with parenthesis otherwise you're just returning the function without executing it.
To be clearer, you can write it this way: #click="() => author.linkUrl ? handleAnalytics() : null"
Note: when having a dynamic tag component, I'd suggest to use the render function instead.
This is an advanced technique, but this way you won't bind things to an element that doesn't need it (without having the kind of hack to return null).
Example:
export default {
props: {
author: { type: Object, required: true },
},
render (h: CreateElement) {
const renderLink = () => {
return h('a', {
attrs: {
href: author.linkUrl,
target: '_blank',
},
on: {
click: this.handleAnalytics
},
)
}
const renderDiv = () => {
return h('div')
}
return this.author.linkUrl ? renderLink() : renderDiv()
}
}
Documention: Vue2, Vue3
In javascript functions are a reference to an object. Just like in any other language you need to store this reference in memory.
Here are a few examples that might help you understand on why its not working:
function handleAnalytics() { return 'bar' };
const resultFromFunction = handleAnalytics();
const referenceFn = handleAnalytics;
resultFromFunction will have bar as it's value, while referenceFn will have the reference to the function handleAnalytics allowing you to do things like:
if (someCondition) {
referenceFn();
}
A more practical example:
function callEuropeanUnionServers() { ... }
function callAmericanServers() { ... }
// Where would the user like for his data to be stored
const callAPI = user.preferesDataIn === 'europe'
? callEuropeanUnionServers
: callEuropeanUnionServers;
// do some logic
// ...
// In this state you won't care which servers the data is stored.
// You will only care that you need to make a request to store the user data.
callAPI();
In your example what happens is that you are doing:
#click="author.linkUrl ? handleAnalytics() : null"
What happens in pseudo code is:
Check the author has a linkUrl
If yes, then EXECUTE handleAnalytics first and then the result of it pass to handler #click
If not, simply pass null
Why it works when you use handleAnalytics and not handleAnalytics()?
Check the author has a linkUrl
If yes, then pass the REFERENCE handleAnalytics to handler #click
If not, simply pass null
Summary
When using handleAnalytics you are passing a reference to #click. When using handleAnalytics() you are passing the result returned from handleAnalytics to #click handler.
I want to keep the value of a variable identical with the content of a textarea.
I don't want to use v-bind or v-model, because I have already bound the textarea with another value.
This is a notebook app, and the textarea is used to display the content of a note, so it has been bound using v-bind with a note object, like
<textarea cols="30" rows="3" v-bind:value="note"></textarea>
Now, I want to add the "edit note" functionality. So when the content of the textarea changes, I want to store its value into a variable, and when the "submit" button is clicked, I pass the value of the variable, which contains the new content of the note, to backend to update the note.
My question is, how to store the textarea's content into the variable after each time the content changes?
I think I cannot use v-model because this way the note will be changed right after the content of the textarea is modified (though not sent to backend), but this is not what I want. What I want is the note to be changed only after the "submit" button is clicked. Thus, I cannot use v-model
Should I use v-on:change? If so, how to get the content of the textarea?
Like,
<textarea v-on:change="updateTheVariable(I need to get the content of the textarea here)"> ... </textarea>
methods: {
updateTheVariable(content of the textarea) {
this.variable = content of the textarea
}
}
Thanks
I'm assuming this thing only shows up when you click some kind of edit button which is why you don't want to alter note so try something like this instead
<button type="button" v-if="!editMode" #click="editNote">Edit</button>
<form v-if="editMode" #submit="handleSubmit">
<fieldset :disabled="saving">
<textarea v-model="editingNote"></textarea>
<button type="submit">Edit</button>
</fieldset>
</form>
export default {
data: () => ({
note: 'whatever', // maybe it's a prop, maybe assigned later, doesn't matter
editMode: false,
editingNote: null, // this will be used to bind the edited value
saving: false
}),
methods: {
editNote () {
this.editingNote = this.note
this.editMode = true
this.saving = false
},
async handleSubmit () {
this.saving = true // disables form inputs and buttons
await axios.post('/notes/update', { note: this.editingNote}) // just an example
this.note = this.editingNote // or maybe use data from the response ¯\_(ツ)_/¯
// or if it's a prop, this.$emit('updated', this.editingNote)
this.editMode = false
}
}
}
As #Phil indicated in a deleted post, the right way to do it is
<textarea #input="updateTheVariable($event.target.value)"></textarea>
.
.
.
methods:{
updateTheVariable(value){
this.variable = value
}
}
I am rendering two texts based on a condition and be able to pass methods to the click event based on the condition. The default text is ADD TO COLLECTION because initially hasPaid property is false. Once payment has been made, I want to set that property to true
The function addToCollection first opens a modal, on the modal, the handlePayment function is implemented. I have been able to conditionally render the div to show either ADD TO COLLECTION or DOWNLOAD using v-on="". I also return hasPaid property from the handlePayment function.
<div class="float-right peexo-faded-text card-inner-text" :face="face" v-on="!hasPaid ? {click: addToCollection} : {click: handleDownload(face)}">
{{!hasPaid ? 'ADD TO COLLECTION': 'DOWNLOAD' }}
</div>
data: function () {
return {
hasPaid: false,
}
},
addToCollection(){
this.showcollectionModal = true;
},
handlePayment(){
this.showcollectionModal = false;
let accept = true;
this.showpaymentsuccessmodal = true;
//this.hasPaid = true;
return {
hasPaid: accept
}
},
I want to be able to set hasPaid property on the handlePayment function for the render function to pick it, so that the handleDownload function can then work.
The last section of this bit is going to be problematic:
v-on="!hasPaid ? {click: addToCollection} : {click: handleDownload(face)}"
When hasPaid is true it will invoke the method handleDownload immediately. That is, it will be called during render, not when the <div> is clicked.
You could fix it by 'wrapping' it in a function:
{click: () => handleDownload(face)}
I've used an arrow function in my example but you could use a normal function if you prefer.
Personally I wouldn't try to do this using the object form of v-on.
My first instinct is that you should consider just having two <div> elements and use v-if to decide which one is showing.
If you did want to use a single <div> I would put the click logic in a method. So:
<div class="..." :face="face" #click="onDivClick(face)">
Note that despite the apparent syntactic similarity to the way you defined your click listener this won't invoke the method immediately.
Then in the methods for the component:
methods: {
onDivClick (face) {
if (this.hasPaid) {
this.handleDownload(face)
} else {
this.addToCollection()
}
}
}
I'm trying to create a custom widget using templates, but variable substitution does not seem to be working for me.
I can see the property value being updated inside the widget, but the DOM does not change. For example, when I use the get() method, I can see the new value of the widget's property. However, the DOM never changes its value.
Here is my template:
<div class="outerContainer">
<div class="container">
<span class="mySpan">My name is ${name}</span>
</div>
</div>
Now, here is my widget code:
define([
"dojo/_base/declare",
"dijit/_WidgetBase",
"dijit/_TemplatedMixin",
"dojo/text!/templates/template.html",
], function (declare, _WidgetBase, _TemplatedMixin, template) {
return declare([_WidgetBase, _TemplatedMixin], {
templateString: template,
name: "",
constructor: function (args) {
console.log("calling constructor of the widget");
this.name = args.name;
},
startup: function() {
this.inherited(arguments);
this.set("name", "Robert"); // this does not work
},
postCreate: function() {
this.inherited(arguments);
this.set("name, "Robert"); // this does not work either
},
_setNameAttr: function(newName) {
// I see this printed in the console.
console.log("Setting name to " + newName);
this._set("name", newName);
// I also see the correct value when I get()
console.log(this.get("name")); // This prints Robert
}
});
});
I was expecting the DOM node to say "My name is Robert" i.e. the new value, but it never updates. Instead, it reads "My name is ". It does not overwrite the default value.
I'm sure I'm missing a silly step somewhere, but can someone help me figure out what?
You should bind the property to that point in the dom. So you will need to change the template to this:
<span class="mySpan">My name is <span data-dojo-attach-point='nameNode'></span></span>
And in your widget you should add this function to bind it whenever name changes:
_setNameAttr: { node: "nameNode", type: "innerHTML" },
Now when name changes, it will change the innerHTML of the nameNode inside your mySpan span. If you need to know more about this binding I recommend checking the docs out.
Hope this helps!