Form ​

Introduction to forms and controls ​

Be sure to use an appropriate type on all inputs (e.g., email for email address or number for numerical information) to take advantage of newer input controls like email verification, number selection, and more.

Here is a quick example to demonstrate BootstrapVueNext's form styles. Keep reading for documentation on supported components, form layout, and more.

{
  "email": "",
  "name": "",
  "food": null,
  "checked": []
}

<template>
  <BForm @submit="onSubmit" @reset="onReset" v-if="show">
    <BFormGroup
      id="input-group-1"
      label="Email address:"
      label-for="input-1"
      description="We'll never share your email with anyone else."
    >
      <BFormInput
        id="input-1"
        v-model="form.email"
        type="email"
        placeholder="Enter email"
        required
      />
    </BFormGroup>

    <BFormGroup id="input-group-2" label="Your Name:" label-for="input-2">
      <BFormInput id="input-2" v-model="form.name" placeholder="Enter name" required />
    </BFormGroup>
    <BFormGroup id="input-group-3" label="Food:" label-for="input-3">
      <BFormSelect id="input-3" v-model="form.food" :options="foods" required />
    </BFormGroup>

    <BFormGroup id="input-group-4">
      <BFormCheckboxGroup v-model="form.checked" id="checkboxes-4">
        <BFormCheckbox value="me">Check me out</BFormCheckbox>
        <BFormCheckbox value="that">Check that out</BFormCheckbox>
      </BFormCheckboxGroup>
    </BFormGroup>
    <BButton type="submit" variant="primary">Submit</BButton>
    <BButton type="reset" variant="danger">Reset</BButton>
  </BForm>

  <BCard class="mt-3" header="Form Data Result">
    <pre class="m-0">{{ form }}</pre>
  </BCard>
</template>

<script setup lang="ts">
const foods = [{text: 'Select One', value: null}, 'Carrots', 'Beans', 'Tomatoes', 'Corn']

const form = reactive({
  email: '',
  name: '',
  food: null,
  checked: [],
})
const show = ref(true)

const onSubmit = (event) => {
  event.preventDefault()
  alert(JSON.stringify(form))
}

const onReset = (event) => {
  event.preventDefault()
  // Reset our form values
  form.email = ''
  form.name = ''
  form.food = null
  form.checked = []
  // Trick to reset/clear native browser form validation state
  show.value = false
  nextTick(() => {
    show.value = true
  })
}
</script>

Inline form ​

Bootstrap 5 has dropped form-specific layout classes for the grid system. See the Bootstrap 5 Changelog.

To create horizontal forms with the grid add the .row class to form groups and use the .col-_-_ classes to specify the width of your labels and controls. Be sure to add .col-form-label to your <label>s as well, so they’re vertically centered with their associated form controls.

You may need to manually address the width and alignment of individual form controls with spacing utilities (as shown below). Lastly, be sure to always include a <label> with each form control, even if you need to hide it from non-screenreader visitors with class .visually-hidden.

<BForm class="d-flex flex-row align-items-center flex-wrap">
  <label class="col-form-label visually-hidden" for="inline-form-input-name">Name</label>
  <div class="col-lg-3 me-2 my-2">
    <BFormInput id="inline-form-input-name" placeholder="Jane Doe" />
  </div>
  <label class="col-form-label visually-hidden" for="inline-form-input-username"
    >Username</label
  >
  <div class="col-lg-3 me-2 my-2">
    <BInputGroup prepend="@" class="col-lg-4">
      <BFormInput id="inline-form-input-username" placeholder="Username" />
    </BInputGroup>
  </div>
  <div class="col-lg-3 me-2 my-2">
    <BFormCheckbox>Remember me</BFormCheckbox>
  </div>
  <div class="col-lg-1 my-2">
    <BButton variant="primary">Save</BButton>
  </div>
</BForm>

Custom form controls and selects are also supported.

<template>
  <BForm>
    <div class="row">
      <label class="col-form-label col-lg-2 me-sm-2" for="inline-form-custom-select-pref"
        >Preference</label
      >
      <div class="col-lg-2">
        <BFormSelect
          id="inline-form-custom-select-pref"
          v-model="customSelect"
          class="mb-2 me-sm-2 mb-sm-0"
          :options="[{text: 'Choose...', value: null}, 'One', 'Two', 'Three']"
        />
      </div>
      <BFormCheckbox class="col-form-label col-lg-3 mb-2 me-sm-2 mb-sm-0"
        >Remember my preference</BFormCheckbox
      >
      <div class="col-lg-2 col-form-label">
        <BButton variant="primary">Save</BButton>
      </div>
    </div>
  </BForm>
</template>

<script setup lang="ts">
import {ref} from 'vue'

const customSelect = ref(null)
</script>

Floating Labels ​

Wrap a BFormInput, BFormTextarea, or BFormSelect in a BFormFloatingLable to enable floating labesl. A placeholder is required on each input in order to make the Bootstrap 5 css work correctly.

<BForm>
  <BFormFloatingLabel label="Email address" label-for="floatingEmail" class="my-2">
    <BFormInput id="floatingEmail" type="email" placeholder="Email address" />
  </BFormFloatingLabel>
  <BFormFloatingLabel label="Password" label-for="floatingPassword" class="my-2">
    <BFormInput id="floatingPassword" type="password" placeholder="Password" />
  </BFormFloatingLabel>
</BForm>

Floating labels work correclty for disable state and readonly states. In addition to styled textual inputs, floating labels also work for plaintext inputs, textareas, input groups and selects. See the Bootstrap 5 documentation for more details.

The floating attribute on the BForm component only applies to single form controls like this:

<BForm floating>
  <BFormInput
    id="floatingFormInputValue"
    type="email"
    placeholder="name@example.com"
  />
  <label for="floatingFormInputValue">Input with value</label>
</BForm>

Accessibility ​

Ensure that all form controls have an appropriate accessible name so that their purpose can be conveyed to users of assistive technologies. The simplest way to achieve this is to use a <label> element, or—in the case of buttons—to include sufficiently descriptive text as part of the <button>...</button> content.

For situations where it’s not possible to include a visible <label> or appropriate text content, there are alternative ways of still providing an accessible name, such as:

• <label> elements hidden using the .visually-hidden class
• Pointing to an existing element that can act as a label using aria-labelledby
• Providing a title attribute
• Explicitly setting the accessible name on an element using aria-label

If none of these are present, assistive technologies may resort to using the placeholder attribute as a fallback for the accessible name on <input> and <textarea> elements. The examples in this section provide a few suggested, case-specific approaches.

While using visually hidden content (.visually-hidden, aria-label, and even placeholder content, which disappears once a form field has content) will benefit assistive technology users, a lack of visible label text may still be problematic for certain users. Some form of visible label is generally the best approach, both for accessibility and usability.

Related form control and layout components ​

See also:

• BFormInput Textual and text-like inputs
• BFormTextarea Text area inputs
• BFormSelect Select input
• BFormRadio Radio Inputs
• BFormCheckbox Checkbox Inputs
• BFormFile File Input
• BFormSpinbutton Numerical range spinbutton input
• BFormTags Customizable tag input
• BFormRating Star rating custom form input and display (Not yet implemented)
• BButton Buttons
• BFormGroup Form Input wrapper to generate form-groups that support labels, help text and feedback
• BInputGroup Form Inputs with add-ons
• BFormRow Create grid rows and columns with tighter margins (available via the Layout and grid components)

Form helper components ​

The following helper components are available with the Form plugin:

• BFormText Help text blocks for inputs
• BFormInvalidFeedback Invalid feedback text blocks for input invalid states
• BFormValidFeedback Valid feedback text blocks for input valid states
• BFormDatalist Easily create a <datalist> for use with BFormInput or plain <input>

Form text helper ​

Display a block of help text below an input with the BFormText helper component. text is displayed with a muted color and slightly smaller font-size.

Tip: Help text should be explicitly associated with the form control it relates to using the aria-describedby attribute. This will ensure that assistive technologies, such as screen readers, will announce this help text when the user focuses or enters the control.

<BForm @submit.stop.prevent>
  <label for="text-password">Password</label>
  <BFormInput
    type="password"
    id="text-password"
    aria-describedby="password-help-block"
  />
  <BFormText id="password-help-block">
    Your password must be 8-20 characters long, contain letters and numbers, and must not
    contain spaces, special characters, or emoji.
  </BFormText>
</BForm>

Feedback helpers ​

The BFormValidFeedback and BFormInvalidFeedback helper components will display feedback (based on input state) as a block of colored text. They rely on being placed after an input (sibling) and will show based on the browser native validation state of the input. To force them to show, set the prop force-show to true, or bind the controls state to the state prop of the feedback helper, or set the was-validated class on a parent element (such as a form). See the Validation section below for additional details.

Use the optional Boolean prop tooltip to change the display from a block to a static tooltip style. The feedback will typically appear below the form control. When this mode is enabled, it is important that the parent container have a position: relative: css style (or position-relative class). Note that tooltip style feedback may, since its positioning is static, obscure other inputs, labels, etc.

Note: Some form controls, such as BFormRadio and BFormCheckbox have wrapper elements which will prevent the feedback text from automatically showing (as the feedback component is not a direct sibling of the form control's input). Use the feedback component's state prop (bound to the state of the form control) or the force-show prop to display the feedback.

<template>
  <BForm @submit.stop.prevent>
    <label for="feedback-user">User Id</label>
    <BFormInput v-model="userId" :state="validation" id="feedback-user" />
    <BFormInvalidFeedback :state="validation">
      Your user Id must be 5-12 characters long.
    </BFormInvalidFeedback>
    <BFormValidFeedback :state="validation"> Looks Good. </BFormValidFeedback>
  </BForm>
</template>

<script setup lang="ts">
const userId = ref('')

const validation = computed(() => userId.value.length > 4 && userId.value.length < 13)
</script>

Datalist helper ​

For browsers that support <datalist> elements, the <BFormDatalist> helper component will allow you to quickly create a <datalist> and child <option> elements via an array passed to the options prop.

You may also manually provide <option> elements inside <BFormDatalist>. They will appear below any <option> elements generated from the options prop. Or use the first slot to place options above the generated options.

<template>
  <div>
    <label for="input-with-list">Input with datalist</label>
    <BFormInput id="input-with-list" list="input-list" />
    <BFormDatalist id="input-list" :options="datalistOptions" />
  </div>
</template>

<script setup lang="ts">
const datalistOptions = ['Apple', 'Banana', 'Grape', 'Kiwi', 'Orange']
</script>

See also:

• <BFormInput> datalist for datalist usage.
• <BFormSelect> options prop docs for details on the formats and helper props associated with options. Note that <BFormDatalist> only support a flat list of BFormSelectOptions, unlike <BFormSelect> which support a heirarchy of BFormSelectOption and BFormSelectOptionGroup.

Validation ​

Disable browser native HTML5 validation by setting the novalidate prop to true on BForm.

Set the validated prop, on BForm, to true to add the Bootstrap v5 .was-validated class to the form to trigger validation states.

All form controls support a state prop, which can be used to set the form control into one of three contextual states:

• false (denotes invalid state) is great for when there is a blocking or required field. A user must fill in this field properly to submit the form
• true (denotes valid state) is ideal for situations when you have per-field validation throughout a form and want to encourage a user through the rest of the fields
• null Displays no validation state (neither valid nor invalid)

Refer to the Bootstrap v5 Form Validation Documentation for details on the Bootstrap v5 validation states.