Sorry for newbie question. But how can i get an index of selected element from selectbox and run a function. My code below doesn't trigger switchView() function.
<select id="selectbox" @change="switchView(index)">
<option [v-for="(item, index) in items" v-bind:value="item.title"]>
{{ item.title }}
</option>
</select>
any help will be appreciated.
EDITED: moved @change="switchView(index)"
from <option>
to <select>
, thanks to @Phil
I need index, because i have several calculated items. And i need change view according to user's selection from items.
$event.target.selectedIndex
to your functionUse the @change
directive to listen to the change event. Invoke your function and pass the $event
or the selected index of the event target $event.target.selectedIndex
as a parameter to your function.
<select @change="switchView($event, $event.target.selectedIndex)">
Your method receives the passed parameters.
methods: {
switchView: function(event, selectedIndex) {
console.log(event, selectedIndex);
}
}
<div id="app">
<select @change="switchView($event, $event.target.selectedIndex)">
<option v-for="(item, index) in items" v-bind:value="item.title">
{{ item.title }}
</option>
</select>
<p>
{{ selectedIndex }} {{ items[selectedIndex].id }}
</p>
</div>
<script>
new Vue({
el: "#app",
data: {
items: [
{ title: "Learn JavaScript", id: 'A' },
{ title: "Learn Vue", id: 'B' },
{ title: "Play around in JSFiddle", id: 'C' },
{ title: "Build something awesome", id: 'D' }
],
selectedIndex: 0
},
methods: {
switchView: function(event, selectedIndex) {
console.log(event, selectedIndex);
this.selectedIndex = selectedIndex;
}
}
});
</script>
Mozilla documentation about HTMLSelectElement.selectedIndex .
You can use @change
on select
element and get the index with help of indexOf function. Here is working demo .
See code:
var demo = new Vue({
el: '#demo',
data: function(){
return {
age: '',
selectedIndex: '',
options: [1,2,3,44,55]
};
},
methods: {
selected: function () {
this.selectedIndex = this.options.indexOf(this.age)
alert('this is selected Index ' + this.selectedIndex)
}
}
})
For an pre-modified bootstrap-vue, this event handling might be different from the $event.target.selectedIndex . Especially for Vue 3, this answer might save your time.
<b-form-select @change="onChange" :options="options"></b-form-select>
Method that receives event from the user selection.
methods: {
onChange: function(event) {
let index = event.target.selectedIndex
}
}
Full Example might be as follows:
<div id="app">
<select @change="onChange">
</select>
<p>Selected index: {{ selectedIndex }}</p>
</div>
<script>
new Vue({
el: "#app",
data: {
items: [
"option 1",
"option 2",
"option 3",
"option 4"
],
selectedIndex: 0
},
methods: {
onChange: function(event) {
let index = event.target.selectedIndex // this selectedIndex is from event.
this.selectedIndex = index
}
}
});
</script>
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