I am trying to pass through a v-for the text and the #click action of each li. For the text I know how to do it...but for the click action?enter code here
Each item of the array menuOptions (which is in the 'data' part of my Vue component) is structured like this :
{name: "firstOption",action: "console.log('first option called')"}
The first parameter is the name of the option, the
<ul>
<li v-for="option in menuOptions" #click="option.action">{{option.name}}</li>
</ul>
Do you have some ideas? (I guess that's maybe a pure JS question, but maybe there are possibilities to do it Vue too?)
Pass a function expression to the action property, instead of a "stringified" function.
{
name: 'firstOption',
action: function() {console.log('first option called'}
}
var app = new Vue({
el: '#app',
data: {
menuOptions: [{
action: function() {
console.log('foo')
},
name: 'foo'
}, {
action: function() {
console.log('bar')
},
name: 'bar'
}],
}
})
<script src="https://unpkg.com/vue"></script>
<div id='app'>
<ul>
<li v-for="option in menuOptions" #click="option.action">{{option.name}}</li>
</ul>
</div>
Related
Super simple question but i've never been able to solve it.
Say we have some data:
section: {
option1: true,
option2: true
}
and on a button we have:
<button #click="toggle(option1)">
How do I dynamically paste 'option1' arg into something like this:
toggle(opp){
console.log(this.section.opp)
}
Because currently it's literally looking for this.section.opp, and opp doesn't exist in the data.
Use this.section[opp] instead of this.section.opp as opp contains dynamic value and can not access directly with dot(.) notation as it is containing a different value.
Working Demo :
new Vue({
el: '#app',
data: {
section: {
option1: true,
option2: true
},
result: null
},
methods: {
toggle(opp) {
this.result = this.section[opp];
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<button #click="toggle('option1')">Click Me</button>
<p>Result: {{ result }}</p>
</div>
I'm trying create a follow button on list items in Vue. My strategy is to grab the value of a particular list item property and store it in the data object. Then use this value in a method to add it to an array in my database.
<div v-for="result in results" :key="result.symbol">
{{ result.name }}
<button #click="followStock">+follow</button>
</div>
I'm not sure how to get the value of result.symbol "into" the button element to set the value symbol in the data object below.
<script>
export default {
data() {
return {
results: [ // this is populated by an api call
{
currency: "USD"
exchangeShortName: "NYSE"
name: "International Game Technology PLC"
stockExchange: "NYSE"
symbol: "IGT"
},
{...},
...
],
symbol: "",
};
},
followStock() {
// add this.symbol to database array
},
},
};
</script>
I'm guessing there might be an easier strategy I'm overlooking as I'm still new to Vue, so any other solution that essentially allows me to fire off the value of result.symbol from any rendered result to my database would be awesome.
You can just pass the result as a parameter to your method.
<div v-for="result in results" :key="result.symbol">
{{ result.name }}
<button #click="followStock(result)">+follow</button>
</div>
And in your method:
methods: {
followStock(result) {
// do something with result
console.log({result});
let symbol = result.symbol;
},
}
P.S I didn't see you put your followStock() inside a methods object, but I did so in the example. https://v2.vuejs.org/v2/api/#methods
Write directly as a function call.
The vue compiler will turn followStock(result.symbol) into function(event) {followStock(result.symbol)}.
new Vue({
el: '#app',
data() {
return {
results: [
{
name: "International Game Technology PLC",
symbol: "IGT"
},
{
name: "A name",
symbol: "A symbol"
}
]
};
},
methods: {
followStock(symbol) {
console.log(symbol)
},
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="result in results" :key="result.symbol">
{{ result.name }}
<button #click="followStock(result.symbol)">+follow</button>
</div>
</div>
As Nazaire mentioned you can access the results anywhere inside the child elements when using v-for.
(it works like a normal for-loop)
It's not only limited to the corresponding element (the element in which you do v-for)
<div v-for="result in results" :key="result.symbol">
{{ result.name }}
<button #click="followStock(result.symbol)">+follow</button>
</div>
followStock(symbol){
// you can now add symbol to db
}
I'm using html and laravel to build select box options in a foreach loop
This works and populates with ID as value and name as the option. What I want, and can't quite figure out here, is how to take my function when I call it and get the id and value as separate vue options for a post axios call I'm going to make.
So when I select the option and submit the form to call the function, how can I get the ID as one prop and the name as another?
<select>
#foreach($details as $detail)
<option value="{{$detail->id}}">{{$detail->name}}</option>
#endforeach
</select>
new Vue({
data: {
detailID: [''],
detailName: ['']
},
methods: {
let data = {
detailID: this.detailID,
detailName: this.detailName
};
}
})
Here is a code example just using vue.js
Template
<div id="app">
<select v-model="selectedDetailId">
<option v-for="detail in details" v-bind:value="detail.id">
{{ detail.name }}
</option>
</select>
</div>
Script
new Vue({
el: '#app',
data: {
selectedDetailId: null,
details: [
{ id: 1, name: 'A' },
{ id: 2, name: 'B' },
{ id: 3, name: 'C' }
]
},
methods:{
post(){
//your selected Id is this.selectedDetailId
}
}
})
You can find more details and examples in the official Vue.js docs.
https://v2.vuejs.org/v2/guide/forms.html#Value-Bindings
Use v-model to bind the selection to your component data. SeeForm input bindings:
new Vue({
data: {
detailID: ""
},
// now you can access the id with this.detailID in your post request
})
<select v-model="detailID">
#foreach($details as $detail)
<option value="{{$detail->id}}">{{$detail->name}}</option>
#endforeach
</select>
And if you need both id and name, one work around could be:
new Vue({
data: {
detail: ""
},
// now you can access the id & name with this.detail.split(',') in your post request
})
<select v-model="detail">
#foreach($details as $detail)
<option value="{{$detail->id.','.$detail->name}}">{{$detail->name}}</option>
#endforeach
</select>
You would need to set a v-model to your select element and bind the entire object to each option element instead of just the id like you are doing in your example.
Here is a codepen with a simple example.
I have below array, that contains a number of columns. Below example contains three columns, but columns can be added/removed dynamically:
[['position', '30'], ['position', '60'], ['position', '90']]
I am facing issues when deleting the correct column (index in array) with Vue.
Consider below snippet:
new Vue({
el: '#app',
data: {
message: 'Hello Vue.js!',
columns: [['position', '30'], ['position', '60'], ['position', '90']]
},
methods: {
deleteColumn: function(index) {
this.columns.splice(index, 1);
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="(item, index) in columns" :key="index">
Column #: {{index}} - <a #click="deleteColumn(index)">Delete me</a>
</div>
</div>
If you run the above code snippet end try to delete the #1 column, it will actually remove the #2 column (last item of the array). Same goes for #0.
I thought that by providing the index to my deleteColumn function, I could remove the "right" index from the array.
Any help is appreciated.
Just give them a property name and you are done. Notice what I changed here. Columns is no more a 2D array, but objects. Use this.$delete(this.columns, index); to delete the objects.
new Vue({
el: '#app',
data: {
message: 'Hello Vue.js!',
columns: {
'1': {
position: 30
},
'2': {
position: 60
},
'3': {
position: 90
}
}
},
methods: {
deleteColumn: function(index) {
this.$delete(this.columns, index);
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="(item, index) in columns" :key="index">
Column #: {{index}} - <a #click="deleteColumn(index)">Delete me</a>
</div>
</div>
{
'1': {
position: 30
},
'2': {
position: 60
},
'3': {
position: 90
}
}
Here, '1' is a property name and it's value is another object. It's like giving ids to your data.
The format for value of object is this
{ property_name : value }
Here, value is another object, and in that object, there is another property, named "position" with your corresponding values.
When you clicked any item you are removing it in the right way, your index is your key, that's the problem, but is visually, in the logic it's right. Display your position in your template just for you can see it. ANd for me your data it's not in the right way.
<div id="app">
<div v-for="(item, index) in columns" :key="index">
Column #: {{index}}-{{item.position}} -
<a #click="deleteColumn(index)">Delete me</a>
</div>
</div>
and your script for you can see the change
new Vue({
el: '#app',
data: {
message: 'Hello Vue.js!',
columns: [{position: 30}, {position: 60}, {position: 90}]
},
methods: {
deleteColumn: function(index) {
this.columns.splice(index, 1);
}
}
})
The splice method reindexes the array, moving all elements after the splice point up or down so that any new inserted values will fit and so that the array indices remain contiguous. You can see it more clearly if you also display the values of the items in your list:
new Vue({
el: '#app',
data: {
message: 'Hello Vue.js!',
columns: ['foo', 'bar', 'baz']
},
methods: {
deleteColumn: function(index) {
this.columns.splice(index, 1);
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="(item, index) in columns" :key="index">
Column #{{index}} = {{item}} - <a #click="deleteColumn(index)" style="cursor:pointer">Delete me</a>
</div>
</div>
Initially, the snippet above will render like this:
Column #0 = foo - Delete me
Column #1 = bar - Delete me
Column #2 = baz - Delete me
If you now click the "Delete me" link on column #0 ("foo"), it will change to:
Column #0 = bar - Delete me
Column #1 = baz - Delete me
You can see that the value "foo" indeed got spliced out of the array — and the values "bar" and "baz" were shifted down by one position to become the new elements #0 and #1.
Anyway, the fix for this problem is simply "don't do that":
If you're using v-for with a simple array whose elements have no natural key value, you can just omit :key entirely and let Vue decide how to best handle changes to the underlying array. As long as the contents within the v-for loop doesn't contain any form inputs or stateful components or other fancy stuff that doesn't react well to the array being reindexed, it should work just fine.
Conversely, if you do have a natural unique key available for each array element, use it. If you don't, but can create one, consider doing that.
You should not use index as the key with CRUD operations since this will confuse Vue when it comes to deleting. The key should be a unique identifier that relates to the data.
You can create a new formatted array of objects on mount with a key generated from the data within the array (note: I haven't tested the code in a browser if there are any mistakes).
<template>
<div>
<div v-for="col in formattedColumns" :key="col.key">
{{ col.value }}
</div>
</div>
</template>
<script>
export default {
data() {
return {
columns: [['position', '30'], ['position', '60'], ['position', '90']],
formattedColumns: null,
};
},
mounted() {
let columns = [];
for (let i = 0; i < this.columns.length; i++) {
columns.push({
value: this.columns[i],
key: this.columns[i][0] + this.columns[i][1],
});
}
this.formattedColumns = columns;
},
};
</script>
Try this this.$delete(this.columns, index) which is the same as Vue.delete(this.columns, index)
https://v2.vuejs.org/v2/api/index.html#Vue-delete
I am using Bootstrap-Vue to display a table, and I've added in an extra column with an update button using vue-slot. I have this displaying fine, and I have a method being called when you click the button. Within that method I can access all the information on the item however I can't seem to find a way to access the button. I want to disable it and change the contents of it. How can I access the button element? I have created a codepen example here that shows what I have set up and need to do.
HTML
<div id='app'>
<div>{{ this.output }}</div>
<b-table hover head-variant="dark"
id="pages-table"
:items="items"
:fields="fields">
<template slot="actions" slot-scope="data">
<button class="btn btn-dark" #click="update(data)">Update</button>
</template>
</b-table>
</div>
JavaScript
new Vue({
el: "#app",
data: {
output: null,
items: [
{
id: 1,
name: "Tony"
},
{
id: 2,
name: "John"
},
{
id: 3,
name: "Paul"
}
],
fields: [
{
key: "id",
label: "ID",
sortable: true
},
{ key: "name" },
{ key: "actions" }
]
},
methods: {
update(data) {
// I need to disable the button here
this.output = data;
data.item.name = "Dave";
}
}
});
You could add a dynamic ref to the button
<button class="btn btn-dark" #click="update(data)" :ref="'btn' + data.index">Update</button>
And then just access the button by that ref
this.$refs["btn" + data.index].disabled = true
This is a codepen with the example
https://codepen.io/vlaem/pen/gNjGQE
Instead of the index you could also use the id property of your data to create the ref (data.item.id)
Though personally this doens't feel right, I think it would be better if we could track the status of all the buttons on the same or a different array, maybe like in the following example
https://codepen.io/vlaem/pen/GbBMLe