How would I access variables declared within the setup script within the none setup script? I attempt to update the message in the example below when something happens within the script tags. However, msg just returns undefined, I've looked through the Vue documentation on setup scrips, but there doesn't seem to be any mention of accessing the variable in none setup scripts.
<script setup>
var msg = 'Hello!';
</script>
<script>
export default {
data() {
return {
};
},
mounted(){
// my current attempt to get msg and update it. However, I just get undefined.
this.msg = 'Something happened inside script tags';
//or msg = 'Something happened inside script tags';
},
</script>
<template>
<p>{{ msg }}</p>
</template>
Seems like you are mixing up two syntaxes here - the newer, Composition API (Vue3, setup script) and Options API (Vue2 style, one with data and mounted functions). While it's still ok to use the Options API syntax, you should only use one of the two. I suggest reading up on the different syntaxes:
Composition API
Options API
The tag is syntactic sugar for THIS type of syntax. Everything returned by the setup() function will be made available to the template. If you're using the tag, by default everything is made available.
For the Options API syntax, everything returned by the data function is made available to the template. Delete the entire first tag and try adding the "msg" property to the object returned by the data function and see if it works.
data() {
return {
msg: ''
};
}
Related
I have written the following code in a single Vue component. I am very new to Vue. I want to know how can I update the msg variable in the following and pass the updated value to the template in this Vue component:
<template>
<div class="dropzone">
<form id="dropzone" method='POST' enctype="multipart/form-data" v-on:drop="upload" #dragover.prevent>
<my-vue-component v-model="msg" ref="markdownEditor" />
</form>
</div>
</template>
<script>
export default {
data: () => {
return {
msg: 'zyx'
}
},
methods: {
upload: (e) => {
self.msg = '123'
}
}
}
</script>
I am really stuck and none of the links that google redirects me to are out of my reach. Because all of them either talk about new Vue({}) or dont provide much on export default.
Am I doing something wrong here?
I have also tried this.msg, but then I get the error saying msg of undefined...
Change this:
upload: (e) => {
self.msg = '123'
}
to this:
upload (e) {
this.msg = '123'
}
Note that upload (e) { is short-hand for upload: function (e) {.
The key changes are:
Use this instead of self.
Don't use an arrow function because that binds this to the surrounding scope and in this case that's the global scope. What you want is for this to be bound to your component instance (which is actually a Vue instance) so you need to use a normal function. Vue tries to ensure the binding is correct but it can't do that with an arrow function because it is already bound.
The config options that appear in a component like this are almost all the same as the config options that you would pass to new Vue, so if you see examples that are using the other one it will rarely make any difference. Usually it is pretty obvious when a config setting doesn't make sense for one or the other.
I have a template like this:
<template>
<div>{{hello}}</div>
</template>
<script>
export default {
data() {
hello: "Hello World!",
secret: "The answer is 42"
}
}
</script>
How can I get, and manipulate the value of secret from the Chrome debugging console?
I have installed the Vue extension which allows me to look at my component and see the variables. What I would like to do is to get these variables and manipulate them.
Is this possible?
There is a similar discussion on the Vue.js forum. Specifically, SevenLines post on Mar 25 2018 reads:
Update from 2018. If you use vue-devtools, you can access Vue from
console by selecting desired component, and then accessing it through
$vm variable. Check the image with example:
I use this
// if result is single element
document.getElementById('app').__vue__
// if result is multiple elements
document.getElementsByClassName('some-class')[0].__vue__
assuming your using id #app for your entry
can also do it in other elements as long as identified as Vue Component
element
and get element by tag/id/class
Here's what I put in the Console, and it immediately modifies the data shown on the page:
myapp = app.__vue__.$children[0]
myapp.hello = 'Bonjour'
myapp.hello = 'Buenos dias'
Mysteriously, if you skip assigning the object to a variable, it doesn't work as intended:
app.__vue__.$children[0].hello = 'Bonjour' // first time it works
app.__vue__.$children[0].hello = 'Buenos dias' // second time it doesn't work
I have a menu of topics (e.g. "About us", "Support") and I want to be able to tell what topic is active right now. When a topic is clicked it will become the active one. Think of it as a substitute for a router that will set an active route. This is not possible in my case since I'm working in SharePoint 2010... in a content editor. So I made the decision to have an activeTopic variable in my Vue instance.
The Vue instance
new Vue({
el: '#app',
data: {
activeTopic: '',
}
});
This is because the activeTopic has to update another component and show some data based on the active topic. Like a router showing a child route.
The topic component
Vue.component('topic', {
props: ["title"],
methods: {
setActiveTopic: function (title) {
activeTopic = title;
},
isActiveTopic: function (title) {
return activeTopic == title;
}
},
template: `
<div v-bind:class="{active: isActiveTopic(title)}" v-on:click="setActiveTopic(title)">
<p v-text="title"></p>
</div>
`
});
The setActiveTopic function works as it should when I click it; it updates the activeTopic. But the isActiveTopic function gives me this error:
Error in render: "ReferenceError: activeTopic is not defined"
What I don't understand is that I can edit the activeTopic variable but I can't make a comparison? I've tried setting a default value but it still says it is undefined.
activeTopic should be assigned to the Vue component by setting and reading this.activeTopic. As is, you have two independent activeTopic variables scoped within each of your component methods.
You'll also want to include activeTopic in the component's data block, rather than on the Vue object itself, since it's specific to the component.
(If there's a reason to put that variable on the Vue object you would either want to pass it down to the component as a prop, or else access it directly as Vue.activeTopic instead of this.activeTopic. I'm honestly not certain whether Vue would treat that last structure as a reactive value within components -- I've never had a reason to try that, and can't think of a situation where that'd be a reasonable architecture.)
Vue.component('topic', {
props: ["title"],
data() { return {
activeTopic: ''
}},
methods: {
setActiveTopic(title) {
this.activeTopic = title;
},
isActiveTopic(title) {
return this.activeTopic == title;
}
},
template: `
<div v-bind:class="{active: isActiveTopic(title)}" v-on:click="setActiveTopic(title)">
<p v-text="title"></p>
</div>
`
});
I am new to Vue, and have seen data being defined as an object in several examples.
But apparently, as per the documentation, you have to use data as a function that returns an object.
This is to ensure that all instances will have it's own version of the data object, and is not shared with all instances.
Instead of
data: {
count: 0
}
use
data: function () {
return {
count: 0
}
}
However I still don't know why in one of my component, data as an object worked, and in a child component with it's own data as an object, I got the error count is undefined;
I am assuming, the root element, (defined by new Vue({}) has to be a singleton, and is not intended to have several instances.
And since components, can have instances, the data in that needs to be defined as a function.
I'm a beginner, this is probably more of a javascript problem than vue but anyway:
there a plugin for spreadsheet named handsontable and in the normal use you make the table by doing this
hot = new Handsontable(container, {option})
and then you can use the method like hot.loadData() etc..
To use handsontable with vuejs, there a wrapper we can find here https://github.com/handsontable/vue-handsontable-official. With the wrapper you make a table like this :
<template>
<div id="hot-preview">
<HotTable :root="root" :settings="hotSettings"></HotTable>
</div>
</template>
<script>
import HotTable from 'vue-handsontable-official';
import Vue from 'vue';
export default {
data: function() {
return {
root: 'test-hot',
hotSettings: {
data: [['sample', 'data']],
colHeaders: true
}
};
},
components: {
HotTable
}
mounted () {
localforage.config({
driver: localforage.INDEXEDDB,
name: 'matchlist-database'
})
localforage.getItem('DB').then(function (value) {
console.log('then i fetch the DB: ' + JSON.stringify(value))
if (value !== 'null') {
console.log('dB contain something')
**root**.loadData(value)
}
</script>
So it work fine when i give an array but to load the data from a DB you must call the handsontable method hot.loadData(data).
i cannot find how to call this method in vuejs i always get the error
TypeError: root.loadData is not a function
i tried with all i could think of instead of root ex: HotTable.loadData(value)
but to no avail
Can someone point me out how i would call handsontable methods from the vuejs wrapper. Or point me out what kind of reading i should do to understand my mistake. Thank a lot
There are two problems here, not bad ones :)
1st problem:
If you want to refer to your data inside Vue's methods/computed properties/watchers/lifecycle events, you should use the this keyword. If you have data: function() { return { root: "root-value" }} and you would like to console.log that "root-value" string, you should write console.log(this.root) inside your mounted handler.
If you had something like:
data: function() {
return {
hot = new Handsontable(container, {option})
....
};
You could call hot.loadData() like so:
mounted() {
this.hot.loadData();
...
}
So this refers to the Vue instance which exposes your data properties.
2nd problem:
If I understand the component wrapper correctly, you are supposed to pass data to it as props, not call any Handsontable methods directly.
<HotTable :root="root" :settings="hotSettings"></HotTable>
This means that Vue passes whatever you have as root in your data to the HotTable component. It also passes whatever you have as settings in your data. In the example, HotTable receives these:
root: 'test-hot',
hotSettings: {
data: [['sample', 'data']],
colHeaders: true
}
Now if you want to change/update/modify/add data that should be passed to the HotTable component, you should update your data in the Vue instance. You should do something like this.hotSettings = something new and this.root = something else and the HotTable component would receive those.
To understand what's really happnening with the HotTable, read all of the component documentation. Really. You will save lots of time if you read through the documentation. It all makes sense after that!
https://v2.vuejs.org/v2/guide/components.html
I'd like to insert new vuejs components on the fly, at arbitrary points within a block of not-necessarily-predefined HTML.
Here's a slightly contrived example that demonstrates the sort of thing I'm trying to do:
Vue.component('child', {
// pretend I do something useful
template: '<span>--><slot></slot><--</span>'
})
Vue.component('parent', {
data() {
return {
input: 'lorem',
text: '<p>Lorem ipsum dolor sit amet.</p><p><i>Lorem ipsum!</i></p>'
}
},
template: `<div>
Search: <input type='text' v-model="input"><br>
<hr>
This inserts the child component but doesn't render it
or the HTML:
<div>{{output}}</div>
<hr>
This renders the HTML but of course strips out the child component:
<div v-html="output"></div>
<hr>
(This is the child component, just to show that it's usable here:
<child>hello</child>)
<hr>
This is the goal: it renders both the input html
and the inserted child components:
TODO ¯\_(ツ)_/¯
</div>`,
computed: {
output() {
/* This is the wrong approach; what do I replace it with? */
var out = this.text;
if (this.input) {
this.input = this.input.replace(/[^a-zA-Z\s]/g,'');
var regex = new RegExp(this.input, "gi");
out = out.replace(regex, '<child><b>' + this.input + '</b></child>');
}
return out;
}
}
});
new Vue({
el: '#app'
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.0/vue.js"></script>
<div id="app">
<parent></parent>
</div>
In the above snippet, assume data.text is sanitized HTML. <child> is some sub-component that does something useful, which I want to wrap around chunks of data.text that aren't known ahead of time. (input is just for demo here. This MCVE doesn't really resemble the code I'm building, it's just an example that shows the sort of situation I'm stuck on.)
So: how would I change either the output function or the parent component's template, such that both the HTML from input and the inserted <child> templates are rendered properly?
What I've tried
In Vue 1, the answer to this would be a straightforward $compile. I'm using vuejs2 which removed $compile (out of justifiable concern that it made it too easy to naively introduce XSS vulnerabilities.)
v-html sanitizes what you feed it, which strips the child component out. Obviously this is not the way to do this. (That page suggests using partials instead, but I'm not sure how that could be applied to this situation; in any case partials have also been removed from vue2.)
I've tried passing the results of output() into another component which would then use it as its template. This seems like a promising approach, but I can't figure out how to change that secondary component's template. template only accepts a string, not a function like many of the other component properties, so I can't pass the template html in, say, a prop. Something like rewriting this.template inside beforeMount() or bind() would have been nice, but no joy there either. Is there some other way to replace a component's template string before it's mounted?
Unlike template, I can pass data to a component's render() function... but then I'm still stuck having to parse that html string into nested createElement functions. Which is exactly what Vue is doing internally in the first place; is there some way to hook into that here short of reinventing it myself?
Vue.component('foo', {
props: ['myInput'],
render(createElement) {
console.log(this.myInput); // this works...
// ...but how to parse the html in this.myInput into a usable render function?
// return createElement('div', this.myInput);
},
})
I wasn't able to cheat my around this with inline-template, either: <foo inline-template>{{$parent.output}}</foo> does exactly the same thing as a plain old {{output}}. In retrospect that should have been obvious, but it was worth a shot.
Maybe constructing an async component on the fly is the answer? This could clearly generate a component with an arbitrary template, but how would I reasonably call that from the parent component, and feed output to the constructor? (It would need to be reusable with different input, with multiple instances potentially visible simultaneously; no globals or singletons.)
I've even considered ridiculous stuff like having output() split the input into an array at the points where it would have inserted <child>, and then doing something like this in the main template:
...
<template v-for="chunk in output">
<span v-html="chunk"></span>
<child>...</child>
</template>
....
That would be doable, if laborious -- I'd have to split out what goes in the child's slot into a separate array too and get it by index during the v-for, but that could be done... if input were plain text instead of HTML. In splitting HTML I'll often wind up with unbalanced tags in each chunk, which can mess up the formatting when v-html rebalances it for me. And anyway this whole strategy feels like a bad hack; there must be a better way.
Maybe I just drop the whole input into a v-html and then (somehow) insert the child components at the proper positions through after-the-fact DOM manipulation? I haven't explored this option too deeply because it, too, feels like a hack, and the reverse of the data-driven strategy, but maybe it's a way to go if all else fails?
A couple of pre-emptive disclaimers
I'm very well aware of the XSS risks involved in $compile-like operations. Please be assured that none of what I'm doing involves unsanitized user input in any way; the user isn't inserting arbitrary component code, instead a component needs to insert child components at user-defined positions.
I'm reasonably confident that this is not an XY problem, that I really do need to insert components on the fly. (I hope it's obvious from the number of failed attempts and blind alleys I've run down that I've put more than a little thought into this one!) That said, if there's a different approach that leads to similar results, I'm all ears. The salient point is that I know which component I need to add, but I can't know ahead of time where to add it; that decision happens at run time.
If it's relevant, in real life I'm using the single-file component structure from vue-cli webpack template, not Vue.component() as in the samples above. Answers that don't stray too far from that structure are preferred, though anything that works will work.
Progress!
#BertEvans points out in comments that Vue.compile() is a thing that exists, which is an I-can't-believe-I-missed-that if ever there was one.
But I'm still having trouble using it without resorting to global variables as in that documentation. This renders, but hardcodes the template in a global:
var precompiled = Vue.compile('<span><child>test</child></span>');
Vue.component('test', {
render: precompiled.render,
staticRenderFns: precompiled.staticRenderFns
});
But various attempts to rejigger that into something that can accept an input property have been unsuccessful (the following for example throws "Error in render function: ReferenceError: _c is not defined", I assume because the staticRenderFns aren't ready to go when render needs them?
Vue.component('test', {
props: ['input'],
render() { return Vue.compile(this.input).render()},
staticRenderFns() {return Vue.compile(this.input).staticRenderFns()}
});
(It's not because there are two separate compile()s -- doing the precompile inside beforeMount() and then returning its render and staticRenderFns throws the same error.)
This really feels like it's on the right track but I'm just stuck on a dumb syntax error or the like...
As mentioned in the my comment above, $compile was removed, but Vue.compile is available in certain builds. Using that below works as I believe you intend except in a couple cases.
Vue.component('child', {
// pretend I do something useful
template: '<span>--><slot></slot><--</span>'
})
Vue.component('parent', {
data() {
return {
input: 'lorem',
text: '<div><p>Lorem ipsum dolor sit amet.</p><p><i>Lorem ipsum!</i></p></div>'
}
},
template: `<div>
Search: <input type='text' v-model="input"><br>
<hr>
<div><component :is="output"></component></div>
</div>`,
computed: {
output() {
if (!this.input)
return Vue.compile(this.text)
/* This is the wrong approach; what do I replace it with? */
var out = this.text;
if (this.input) {
this.input = this.input.replace(/[^a-zA-Z\s]/g,'');
var regex = new RegExp(this.input, "gi");
out = out.replace(regex, '<child><b>' + this.input + '</b></child>');
out = Vue.compile(out)
}
return out;
}
}
});
new Vue({
el: '#app'
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.0/vue.js"></script>
<div id="app">
<parent></parent>
</div>
You mentioned you are building with webpack and I believe the default for that build is Vue without the compiler, so you would need to modify it to use a different build.
I added a dynamic component to accept the results of the compiled output.
The sample text is not a valid template because it has more than one root. I added a wrapping div to make it a valid template.
One note: this will fail if the search term matches all or part of any of the HTML tags in the text. For example, if you enter "i", or "di" or "p" the results will not be what you expect and certain combinations will throw an error on compilation.
I'm posting this as a supplement to Bert Evans's answer, for the benefit of vue-cli webpack users who want to use .vue files instead of Vue.component(). (Which is to say, I'm mostly posting this so I'll be able to find this information when I inevitably forget it...)
Getting the right Vue build
In vue-cli 2 (and possibly 1?), to ensure Vue.compile will be available in the distribution build, confirm webpack.base.conf.js contains this line:
'vue$': 'vue/dist/vue.esm.js' // or vue/dist/vue.common.js for webpack1
instead of 'vue/dist/vue.runtime.esm.js'. (If you accepted the defaults when running vue init webpack you will already have the full standalone build. The "webpack-simple" template also sets the full standalone build.)
Vue-cli 3 works somewhat differently, and does not have Vue.compile available by default; here you'll need to add the runtimeCompiler rule to vue.config.js:
module.exports = {
/* (other config here) */
runtimeCompiler: true
};
The component
The "child" component can be a normal .vue file, nothing special about that.
A bare-bones version of the "parent" component would be:
<template>
<component :is="output"></component>
</template>
<script>
import Vue from 'vue';
import Child from './Child'; // normal .vue component import
export default {
name: 'Parent',
computed: {
output() {
var input = "<span>Arbitrary single-root HTML string that depends on <child></child>. This can come from anywhere; don't use unsanitized user input though...</span>";
var ret = Vue.compile(input);
ret.components = { Child }; // add any other necessary properties similarly
ret.methods = { /* ... */ } // like so
return ret;
}
}
};
</script>
(The only significant difference between this and the non-webpack version is importing the child, then declaring the component dependencies as ret.components: {Child} before returning it.)