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6c61a4e871
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84 lines
2.9 KiB
Markdown
84 lines
2.9 KiB
Markdown
---
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title: v-model Does Not Update During IME Composition
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impact: MEDIUM
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impactDescription: v-model won't capture intermediate input for Chinese, Japanese, Korean and other IME languages
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type: capability
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tags: [vue3, v-model, forms, input, ime, internationalization, i18n, cjk]
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---
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# v-model Does Not Update During IME Composition
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**Impact: MEDIUM** - When users type in languages that require an Input Method Editor (Chinese, Japanese, Korean, etc.), v-model won't update until the composition is complete. This breaks real-time validation, character counters, and live search features for international users.
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IME (Input Method Editor) allows users to compose complex characters by typing multiple keystrokes. During this composition phase, v-model deliberately waits until the user confirms their selection before updating. This is usually desired, but can break features that need every keystroke.
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## Task Checklist
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- [ ] Test forms with IME input if your app serves CJK (Chinese, Japanese, Korean) users
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- [ ] For real-time features (live search, character counters), use manual event binding instead of v-model
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- [ ] Consider both behaviors when designing - sometimes waiting for composition completion IS correct
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- [ ] Document expected behavior for international users
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**Problem - v-model waits for composition:**
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```html
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<script setup>
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import { ref } from 'vue'
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const searchQuery = ref('')
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const charCount = ref(0)
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</script>
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<template>
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<!-- PROBLEM: During IME composition, searchQuery won't update -->
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<!-- Chinese user types "ni hao" -> sees no results until they press space/enter -->
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<input v-model="searchQuery" placeholder="Live search...">
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<p>{{ searchQuery.length }} characters</p>
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<!-- Character counter stays at 0 during IME input -->
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</template>
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```
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**Solution - Manual event binding for real-time updates:**
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```html
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<script setup>
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import { ref } from 'vue'
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const searchQuery = ref('')
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// This captures EVERY input event, including during IME composition
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function handleInput(event) {
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searchQuery.value = event.target.value
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}
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</script>
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<template>
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<!-- CORRECT: Manual binding captures all input, including IME composition -->
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<input
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:value="searchQuery"
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@input="handleInput"
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placeholder="Live search..."
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>
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<p>{{ searchQuery.length }} characters</p>
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</template>
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```
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```html
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<!-- Shorter inline version -->
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<input
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:value="searchQuery"
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@input="event => searchQuery = event.target.value"
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>
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```
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**When v-model behavior IS correct:**
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```html
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<!-- For form submission, waiting for composition IS usually better -->
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<!-- User expects to confirm their character selection before it's "official" -->
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<input v-model="formName" placeholder="Enter your name">
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<!-- The final composed characters will be submitted, not intermediate states -->
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```
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## Reference
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- [Vue.js Form Input Bindings](https://vuejs.org/guide/essentials/forms.html)
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