Creating input fields in Vue 3: Best practices

Question

Creating input fields in Vue 3: Best practices

I am looking to create an input field that automatically removes entered characters if they do not match a specific pattern.

Here is the template:

<input
  type="text"
  :value="val"
  @input="input"
/>

And here is the script:

import { ref } from "vue";
export default {
  setup() {
    let val = ref("");
    const input = ({ target }) => {
      val.value = target.value.replace(/[^\d]/g, "");
    };
    return { val, input };
  },
};

You can view the sandbox here.

javascript vue.js vuejs3

Answer 1

Answer №1

To eliminate entered numbers, you can utilize a watcher:

const { ref, watch } = Vue
const app = Vue.createApp({
  setup() {
    let val = ref("");
    watch(val,
      (newValue, oldValue) => {
        val.value = newValue.replace(/\d+/g, "")
      },
    );
    return { val };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
<div>
    <input
      type="text"
      placeholder="Full Name"
      autocomplete="off"
      v-model="val"
    />
  </div>
  {{ val }}
</div>

Answer 2

To eliminate entered numbers, you can utilize a watcher:

const { ref, watch } = Vue
const app = Vue.createApp({
  setup() {
    let val = ref("");
    watch(val,
      (newValue, oldValue) => {
        val.value = newValue.replace(/\d+/g, "")
      },
    );
    return { val };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
<div>
    <input
      type="text"
      placeholder="Full Name"
      autocomplete="off"
      v-model="val"
    />
  </div>
  {{ val }}
</div>

Answer 3

Answer №2

To restrict user input to numbers only, HTML provides a built-in feature with the

<input type="number">

element.

Answer 4

To restrict user input to numbers only, HTML provides a built-in feature with the

<input type="number">

element.

Answer 5

Answer №3

When looking at your code, it seems that you are replacing content when a pattern is matched. However, based on your question, you want to set the content to null when the pattern is not matched.

setup() {
    let val = ref("");
    const input = ({ target }) => {
      if (target && !target.value) val.value = "";
      if (!/[^\d]/g.test(target.value)) {
        val.value = "";
      }
      val.value = target.value;
    };
    return { val, input };
  },

A more efficient approach would be to create a directive if you plan to implement this in multiple input fields.

const app = createApp({})


app.directive('text-format', {
    mounted(el, binding) {
    el._listener = el.addEventListener("input", (e) => {
      if (!binding.value.test(el.value)) {
        el.value = "";
      }
    });
  },
  unmounted(el) {
    el.removeEventListener("input", el._listener);
  },
})

Your input field should now look like this:

 <input
      v-text-format="/[^\d]/g"
      type="text"
      placeholder="Full Name"
      autocomplete="off"
      v-model="val"
    />

Answer 6

When looking at your code, it seems that you are replacing content when a pattern is matched. However, based on your question, you want to set the content to null when the pattern is not matched.

setup() {
    let val = ref("");
    const input = ({ target }) => {
      if (target && !target.value) val.value = "";
      if (!/[^\d]/g.test(target.value)) {
        val.value = "";
      }
      val.value = target.value;
    };
    return { val, input };
  },

A more efficient approach would be to create a directive if you plan to implement this in multiple input fields.

const app = createApp({})


app.directive('text-format', {
    mounted(el, binding) {
    el._listener = el.addEventListener("input", (e) => {
      if (!binding.value.test(el.value)) {
        el.value = "";
      }
    });
  },
  unmounted(el) {
    el.removeEventListener("input", el._listener);
  },
})

Your input field should now look like this:

 <input
      v-text-format="/[^\d]/g"
      type="text"
      placeholder="Full Name"
      autocomplete="off"
      v-model="val"
    />

Creating input fields in Vue 3: Best practices

Answer №1

Answer №2

Answer №3

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