What methods can be used in VueJS to restrict users from entering numeric values?

Question

What methods can be used in VueJS to restrict users from entering numeric values?

I am struggling to create a validation that prevents users from inputting numeric values into a textbox. I have tried using a native JavaScript solution, but it does not seem to be working on my end.

In my textbox, I have set up this trigger

v-on:keyup="preventNumericInput($event)">

Within my Vue component, I have created a function in the following manner:

preventNumericInput($event) {
    console.log($event.keyCode); //displays the keyCode value
    console.log($event.key); //shows the key value

    var keyCode = ($event.keyCode ? $event.keyCode : $event.which);
    if (keyCode > 47 && keyCode < 58) {
        $event.preventDefault();
    }
}

Could someone please assist me with this issue?

javascript vue.js vuejs2

Answer 1

Answer №1

In my response, I pointed out that the event keyup may not be triggered soon enough to stop the input from being registered in the text field. Consider a scenario where a key is held down to repeatedly enter the same value; there is no corresponding key up.

It is more effective to utilize keydown or keypress

<input @keypress="preventNumericInput">

View the demonstration here: http://jsfiddle.net/wadt08jm/2/

Answer 2

In my response, I pointed out that the event keyup may not be triggered soon enough to stop the input from being registered in the text field. Consider a scenario where a key is held down to repeatedly enter the same value; there is no corresponding key up.

It is more effective to utilize keydown or keypress

<input @keypress="preventNumericInput">

View the demonstration here: http://jsfiddle.net/wadt08jm/2/

Answer 3

Answer №2

When entering input, make sure it is a number for isNaN to function correctly

<input type="number" :value="price" step="0.1" min="0" @input="onInput($event)" >

In the input field, replace any commas with periods
Check if the entered value is not a number
If the value is not a number, replace the observable price with the input element's value

data () {
  return { price: 0 }
},
methods: {
  onInput (e: Event) {
    const element = e.target as HTMLInputElement
    const value = parseFloat(element.value === '' ? '0' : element.value.replace(',', '.'))
    if (isNaN(value)) {
      element.value = this.price.toString()
    } else {
      this.price = value
    }
  }
}

Answer 4

When entering input, make sure it is a number for isNaN to function correctly

<input type="number" :value="price" step="0.1" min="0" @input="onInput($event)" >

In the input field, replace any commas with periods
Check if the entered value is not a number
If the value is not a number, replace the observable price with the input element's value

data () {
  return { price: 0 }
},
methods: {
  onInput (e: Event) {
    const element = e.target as HTMLInputElement
    const value = parseFloat(element.value === '' ? '0' : element.value.replace(',', '.'))
    if (isNaN(value)) {
      element.value = this.price.toString()
    } else {
      this.price = value
    }
  }
}

Answer 5

Answer №3

If you're working with Vue 3, there is a way to disable the scroll-to-change behavior for input elements of type number by using a custom directive. The following code snippet shows how this directive can be implemented:

beforeMount(el, binding, vnode, prevVnode) {
  el.addEventListener('wheel', (event) => {
    if (el.type === 'nunmber') {
        el.blur()
        event.preventDefault()
      }
    },
    { passive: false }
)},
unmounted(el, binding, vnode, prevVnode) {
 document.body.removeEventListener('wheel', (event) => {
   el.blur()
   event.preventDefault()
 })
}

Answer 6

If you're working with Vue 3, there is a way to disable the scroll-to-change behavior for input elements of type number by using a custom directive. The following code snippet shows how this directive can be implemented:

beforeMount(el, binding, vnode, prevVnode) {
  el.addEventListener('wheel', (event) => {
    if (el.type === 'nunmber') {
        el.blur()
        event.preventDefault()
      }
    },
    { passive: false }
)},
unmounted(el, binding, vnode, prevVnode) {
 document.body.removeEventListener('wheel', (event) => {
   el.blur()
   event.preventDefault()
 })
}

What methods can be used in VueJS to restrict users from entering numeric values?

Answer №1

Answer №2

Answer №3

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