How can I programmatically trigger a change event for a dropdown in Vue.js?

Question

How can I programmatically trigger a change event for a dropdown in Vue.js?

I am looking to trigger a dropdown change event within a Vue.js method.

<select id="idDropdown" v-model="Result.Value" v-on:change.prevent="changeSelection($event, 'somevalue')">

How can I call the above `changeSelection()` method when the dropdown value changes in any Vue.js method and pass the `$event` variable?

I have 2 dropdown buttons, and when the model value changes through code like this `Result.Value = 10`, then I want to trigger the `changeSelection` method to bind some data in the second dropdown.

javascript vue.js

Answer 1

Answer №1

It's not necessary to manually trigger the changeSelection function, as it will be invoked automatically when an option is selected.

The use of the .prevent modifier is also unnecessary.

UPDATE

If you programmatically set the selected option outside of the select element, a watcher will be required to execute your desired function.

watch: {
   selected(newVal, oldVal) {
      this.changeSelection(null,newVal)
   }
}

const { createApp } = Vue

const App = {
  data() {
    return { selected: null }
  },
  methods: {
    changeSelection(event, value) {
      if (event != null) console.log("event.target.value: " + event.target.value)
      console.log("value: " + value)
    }
  },
  watch: {
    selected(newVal, oldVal) {
      this.changeSelection(null,newVal)
    }
  }
}

const app = createApp(App)
app.mount('#app')

#app { line-height: 1.75; }
[v-cloak] { display: none; }

<div id="app">
  Select: <select v-model="selected" v-on:change="changeSelection($event, 'somevalue')">
    <option value=1>1</option>
    <option value=2>2</option>
    <option value=3>3</option>
  </select><br/>
  Selected: {{selected}}<br/>
  <button @click="selected = 0">Set 0</button>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>

Answer 2

It's not necessary to manually trigger the changeSelection function, as it will be invoked automatically when an option is selected.

The use of the .prevent modifier is also unnecessary.

UPDATE

If you programmatically set the selected option outside of the select element, a watcher will be required to execute your desired function.

watch: {
   selected(newVal, oldVal) {
      this.changeSelection(null,newVal)
   }
}

const { createApp } = Vue

const App = {
  data() {
    return { selected: null }
  },
  methods: {
    changeSelection(event, value) {
      if (event != null) console.log("event.target.value: " + event.target.value)
      console.log("value: " + value)
    }
  },
  watch: {
    selected(newVal, oldVal) {
      this.changeSelection(null,newVal)
    }
  }
}

const app = createApp(App)
app.mount('#app')

#app { line-height: 1.75; }
[v-cloak] { display: none; }

<div id="app">
  Select: <select v-model="selected" v-on:change="changeSelection($event, 'somevalue')">
    <option value=1>1</option>
    <option value=2>2</option>
    <option value=3>3</option>
  </select><br/>
  Selected: {{selected}}<br/>
  <button @click="selected = 0">Set 0</button>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>

How can I programmatically trigger a change event for a dropdown in Vue.js?

Answer №1

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