Vue Tip: Create Custom v-model Modifier
v-model has some built-in modifiers like .lazy, .number and .trim. But sometimes, you might need to add your custom modifier.
In this simple demo, I want to create a custom modifier called no-underscore that removes all underscores _ from an input:
<Comp v-model.no-underscore="text" />Inside our component we can access the modifier via the modelModifiers prop. We manipulate the value if an input event is fired and the modifier is available:
<script setup>const props = defineProps({ modelValue: String, modelModifiers: { default: () => ({}) },})const emit = defineEmits(['update:modelValue'])function emitValue(e) { let value = e.target.value if (props.modelModifiers['no-underscore']) { value = value.replace('_', '') } emit('update:modelValue', value)}</script><template> <input type="text" :value="modelValue" @input="emitValue" /></template>If your v-model binding includes both modifiers and argument then the generated prop name will be arg + "Modifiers":
<template> <Comp v-model:name.no-underscore="text" /></template><script setup>const props = defineProps(['name', 'nameModifiers'])defineEmits(['update:name'])</script>Demo for this code is available at Vue SFC Playground
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