How can I set selected option selected in vue.js 2? - javascript

My component vue is like this :
<template>
<select class="form-control" v-model="selected" :required #change="changeLocation">
<option :selected>Choose Province</option>
<option v-for="option in options" v-bind:value="option.id" >{{ option.name }}</option>
</select>
</template>
I use this : <option :selected>Choose Province</option> to selected
But whene executed, on the gulp watch exist error
The error like this :
ERROR in
./~/vue-loader/lib/template-compiler.js?id=data-v-53777228!./~/vue-load
er/lib/selector.js?type=template&index=0!./resources/assets/js/components/bootst
rap/LocationBsSelect.vue Module build failed: SyntaxError: Unexpected
token (28:4)
Seems my step is wrong
How can I solve it?

Handling the errors
You are binding properties to nothing. :required in
<select class="form-control" v-model="selected" :required #change="changeLocation">
and :selected in
<option :selected>Choose Province</option>
If you set the code like so, your errors should be gone:
<template>
<select class="form-control" v-model="selected" :required #change="changeLocation">
<option>Choose Province</option>
<option v-for="option in options" v-bind:value="option.id" >{{ option.name }}</option>
</select>
</template>
Getting the select tags to have a default value
you would now need to have a data property called selected so that v-model works. So,
{
data () {
return {
selected: "Choose Province"
}
}
}
If that seems like too much work, you can also do it like:
<template>
<select class="form-control" :required="true" #change="changeLocation">
<option :selected="true">Choose Province</option>
<option v-for="option in options" v-bind:value="option.id" >{{ option.name }}</option>
</select>
</template>
When to use which method?
You can use the v-model approach if your default value depends on some data property.
You can go for the second method if your default selected value happens to be the first option.
You can also handle it programmatically by doing so:
<select class="form-control" :required="true">
<option
v-for="option in options"
v-bind:value="option.id"
:selected="option == '<the default value you want>'"
>{{ option }}</option>
</select>

The simplest answer is to set the selected option to true or false.
<option :selected="selectedDay === 1" value="1">1</option>
Where the data object is:
data() {
return {
selectedDay: '1',
// [1, 2, 3, ..., 31]
days: Array.from({ length: 31 }, (v, i) => i).slice(1)
}
}
This is an example to set the selected month day:
<select v-model="selectedDay" style="width:10%;">
<option v-for="day in days" :selected="selectedDay === day">{{ day }}</option>
</select>
On your data set:
{
data() {
selectedDay: 1,
// [1, 2, 3, ..., 31]
days: Array.from({ length: 31 }, (v, i) => i).slice(1)
},
mounted () {
let selectedDay = new Date();
this.selectedDay = selectedDay.getDate(); // Sets selectedDay to the today's number of the month
}
}

<select v-model="challan.warehouse_id">
<option value="">Select Warehouse</option>
<option v-for="warehouse in warehouses" v-bind:value="warehouse.id" >
{{ warehouse.name }}
</option>
Here "challan.warehouse_id" come from "challan" object you get from:
editChallan: function() {
let that = this;
axios.post('/api/challan_list/get_challan_data', {
challan_id: that.challan_id
})
.then(function (response) {
that.challan = response.data;
})
.catch(function (error) {
that.errors = error;
});
}

You simply need to remove v-bind (:) from selected and required attributes.
Like this :-
<template>
<select class="form-control" v-model="selected" required #change="changeLocation">
<option selected>Choose Province</option>
<option v-for="option in options" v-bind:value="option.id" >{{ option.name }}</option>
</select>
</template>
You are not binding anything to the vue instance through these attributes thats why it is giving error.

My code for reactive multiselect
data() {
return {
article: {title: 'aaaaa', 'categoriesIds': [1,3], ...},
selectCategories: {1: 'xxx', 2: 'www', 3: 'yyy', 4: 'zzz'},
}
},
template
<div class="form-group">
<label for="content">Categories</label>
<select name="categories"
v-model="article.categoriesIds"
id="categories"
multiple
class="form-control col-md-5"
size="6">
<option v-for="(category, key) in selectCategories"
:key="key"
v-bind:value="key">{{category}}</option>
</select>
</div>
Selected items are binded to the article.categoriesIds array.

Another way, which I often find more reliable, is you could add a directive to your app.js or wherever you are initiating your VueJS, eg:
Vue.directive('attr', (el, binding) => {
if (binding.value === true) binding.value = ''
if (binding.value === '' || binding.value) {
el.setAttribute(binding.arg, binding.value)
}
})
You can then utilise v-attr to set an attribute, eg:
<option value="Western Australia" v-attr:selected="form.state == 'Western Australia'">Western Australia</option>

So as I understand the main goal is to set "Choose Province" as the default. I tried other options but the simple one worked for me the best:
<template>
<select class="form-control" v-model="selected" :required #change="changeLocation">
<option>Choose Province</option> # just an option with no selected or assigned v-model
<option v-for="option in options" v-bind:value="option.id" >{{ option.name }}</option>
</select>
</template>

Related

Onclick button isnt working in vue.js in option tag

Im trying to get the item properties that is being clicked in the option button
This is my code
<select #click="populate" class="form-control" tabindex="12">
<option disabled value="" selected="selected">Select one</option>
<option v-for="(payment, index) in paymentsSelect" #click="pop(payment)"
:key="index"
:value="payment.id">{{ payment.name }}
</option>
</select>
this is my data
selectedPayment: '',
paymentsSelect: [],
these are my methods
pop(payment){
console.log(payment)
},
populate(){
var self = this
this.$http.get(this.$backendUrl + 'subjects/payment_method')
.then(function(response) {
self.paymentsSelect = response.data.data
})
.catch(function() {})
},
No need to add event, just bind the select input to a data property using v-model like :
<select v-model="selectedPayment" class="form-control" tabindex="12">
<option disabled value="" selected="selected">Select one</option>
<option
v-for="(payment, index) in paymentsSelect"
:key="index"
:value="payment">
{{ payment.name }}
</option>
</select>
selectedPayment changes when you select an option then use it in your script like this.selectedPayment

How to push object to existing array in Vue.js

In the below code I have a value and that is an object how to can I push to the exist array.
methods: {
onChange(event) {
this.newItems.push(event.target.value);
console.log(event.target.value);
}
}
and my blade is:
<select #change='onChange($event)' class="form-control">
<option value="" selected disabled>Choose</option>
<option v-for='item,key in items' :value="item">#{{ item.name }}</option>
</select>
I would suggest using v-model on the select to detect which is currently selected.
<div id="app">
<select #change="onChange" class="form-control" v-model="selected">
<option value="" selected disabled>Choose</option>
<option v-for='item,key in items' :value="item">#{{ item.name }}
</option>
</select>
<p v-for="newItem in newItems">
{{newItem}}
</p>
</div>
and then push this.selected in your onChange method instead:
this.newItems.push(this.selected)
Hope this helps.
Working fiddle of your code with some small modifications:
https://jsfiddle.net/MapletoneMartin/e4oth98p/7/

How to create dynamic two relational dropdown in Vuejs

I am new to vue.js. I'm stuck trying to dynamically set the options of one select based on the selected value in another.
For example, I have two dropdowns named division and district.
var A = [{1: 'a'},{2:'b'}];
If value of A is 1, then the district select should load the related codes. I can do it with jQuery but not with Vue.
Here is my template.
<div class="form-group" :class="class_obj">
<select name="div_code" v-model="div_code" class="form-control" required>
<option value="">Choose One</option>
<option v-for="option in div_list" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
</div>
<div class="form-group" :class="class_label">
<label for="">District</label>
</div>
<div class="form-group" :class="class_obj">
<select name="dist_code" v-model="dist_code" class="form-control" required>
<option value="">Choose One</option>
</select>
</div>
Here is my javascript.
export default {
data():{
div_list: [
{'1': "ABC"} , {'2': "DEF"}
];
}
}
How can I load the dist_code select with related data from ajax when div_code value is 1?
Handle a change event on the div_code change
<select name="div_code"
v-model="div_code"
#change="onDivCodeChange"
class="form-control"
required>
<option value="">Choose One</option>
<option v-for="option in div_list" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
And add the onDivCodeChange method to your Vue.
methods:{
onCodeChange(){
// make an ajax call and set the options for your
// dist_code here. For example:
$.ajax({
url: "...",
data: {div_code: this.div_code},
success: codes => this.code_list = codes
error: err => console.log(err)
})
}
}
And of course add code_list as a property of your data and update your template.
<select name="dist_code" v-model="dist_code" class="form-control" required>
<option value="">Choose One</option>
<option v-for="code in code_list" :value="code.value">{{code.text}}</option>
</select>
Create computed property. Basically, when data property changes(should be used in computed property) the computed property will update itself.
As in below example, when message property changes the reverseMessage will update itself.
<div id="example">
<p>Original message: "{{ message }}"</p>
<p>Computed reversed message: "{{ reversedMessage }}"</p>
</div>
var vm = new Vue({
el: '#example',
data: {
message: 'Hello'
},
computed: {
// a computed getter
reversedMessage: function () {
// `this` points to the vm instance
return this.message.split('').reverse().join('')
}
}
})
1- In your example, bind your first dropdown value to a data property.
2 -Create a computed property for the second dropdown and use the data
property in it.
3 -Write the template of it.
Done.
When the first dropdown changes the second dropdown will update itself.
Note: Vue documentation advise to use Watcher for Ajax requests instead of computed properties. Both are very similar.
https://v2.vuejs.org/v2/guide/computed.html#Watchers

Select2 with Vue Js as directive

I have been following the vue js wrapper component example. I am trying to change how this works to allow me to add a v-select2 directive to a regular select box rather than have to create templates and components for each one.
I have a JS Bin here which shows using the component.
The component html is as follows (with the options being set in the JS).
<div id="app"></div>
<script type="text/x-template" id="demo-template">
<div>
<p>Selected: {{ selected }}</p>
<select2 :options="options" v-model="selected">
<option disabled value="0">Select one</option>
</select2>
<p>Selected: {{ selected2 }}</p>
<select2 :options="options" v-model="selected2">
<option disabled value="0">Select one</option>
</select2>
<p>Selected: {{ selected3 }}</p>
<select2 :options="options" v-model="selected3">
<option disabled value="0">Select one</option>
</select2>
</div>
</script>
<script type="text/x-template" id="select2-template">
<select>
<slot></slot>
</select>
</script>
With the JS as follows:
Vue.component('select2', {
props: ['options', 'value'],
template: '#select2-template',
mounted: function () {
var vm = this
$(this.$el)
.val(this.value)
// init select2
.select2({ data: this.options })
// emit event on change.
.on('change', function () {
vm.$emit('input', this.value)
})
},
watch: {
value: function (value) {
// update value
$(this.$el).val(value)
},
options: function (options) {
// update options
$(this.$el).select2({ data: options })
}
},
destroyed: function () {
$(this.$el).off().select2('destroy')
}
})
var vm = new Vue({
el: '#app',
template: '#demo-template',
data: {
selected: 0,
selected2: 0,
selected3: 0,
options: [
{ id: 1, text: 'Hello' },
{ id: 2, text: 'World' }
]
}
})
What I want is something like the following
<div id="app">
<p>Selected: {{ selected }}</p>
<select name="selected1" id="selected1" class="select2" v-selectize v-model="selected">
... options here ...
</select>
<p>Selected: {{ selected2 }}</p>
<select name="selected2" id="selected2" class="select2" v-selectize v-model="selected2">
... options here ...
</select>
<p>Selected: {{ selected3 }}</p>
<select name="selected3" id="selected3" class="select2" v-selectize v-model="selected3">
... options here ...
</select>
</div>
You can use your component in pretty much the way you want to use your directive:
<select2 name="selected1" id="selected1" v-model="selected">
<option disabled value="0">Select one</option>
<option value="1">Hello</option>
<option value="2">World</option>
</select2>
The name and id attributes get transferred to the underlying select element.
There is no (good) way to do this with a directive, which is an intentional design decision in Vue 2. There is no communication channel between a directive and the Vue as there is between a component and its parent component. A directive is not a sub-Vue, as a component is, it is a way of dealing with a small piece of the DOM in isolation.
I do not think there would be any particular advantage to writing this with a directive rather than a component.

Vue 2 Dynamic Model with V-for loop pass v-model

I am using a v-for loop to get categories from a vuex store and display in a dropdown form like here:
<label for="sub-category">
<select name="sub-category" required>
<option value="">Choose sub category</option>
<option v-for="(sub, index) in subcategory" :key="index" :value="sub.value">{{ sub.name }}</option>
</select>
<span class="form-error">
<p>You have to choose a sub-category</p>
</span>
</label>
Now everything above works fine, but now I want to save its value to data() and then use that data to make a post request.
I tried
export default {
name: 'formPost',
data() {
return {
selectedSubCat '',
show: false,
};
},
components: {
Headers,
Footers,
},
};
then on the form add a v-model="selectedSubCat", but it's not working.
I also tried:
<select name="sub-category" required>
<option value="">Choose sub category</option>
<option v-model="selectedSubCat[sub.value]" v-for="(sub, index) in subcategory" :key="index" :value="selectedSubCat">{{ sub.name }}</option>
</select>
How can I fix this problem?
I FIXED IT :(
<select name="sub-category" required v-model="selectedSubCat">
<option value="">Choose sub category</option>
<option v-for="(sub, index) in subcategory" :key="index" :value="selectedSubCat">{{ sub.name }}</option>
</select>
I was missing it :( - I had to get the value from select...
This is the solution to my problem!
<select name="sub-category" required v-model="selectedSubCat">
<option value="">Choose sub category</option>
<option v-for="(sub, index) in subcategory" :key="index" :value="selectedSubCat">{{ sub.name }}</option>
</select>

Categories