Form

Bootstrap form component that optionally supports inline form styles and validation states

<template>
  <div>
    <b-form @submit="onSubmit" @reset="onReset" v-if="show">
      <b-form-group id="exampleInputGroup1"
                    label="Email address:"
                    label-for="exampleInput1"
                    description="We'll never share your email with anyone else.">
        <b-form-input id="exampleInput1"
                      type="email"
                      v-model="form.email"
                      required
                      placeholder="Enter email">
        </b-form-input>
      </b-form-group>
      <b-form-group id="exampleInputGroup2"
                    label="Your Name:"
                    label-for="exampleInput2">
        <b-form-input id="exampleInput2"
                      type="text"
                      v-model="form.name"
                      required
                      placeholder="Enter name">
        </b-form-input>
      </b-form-group>
      <b-form-group id="exampleInputGroup3"
                    label="Food:"
                    label-for="exampleInput3">
        <b-form-select id="exampleInput3"
                      :options="foods"
                      required
                      v-model="form.food">
        </b-form-select>
      </b-form-group>
      <b-form-group id="exampleGroup4">
        <b-form-checkbox-group v-model="form.checked" id="exampleChecks">
          <b-form-checkbox value="me">Check me out</b-form-checkbox>
          <b-form-checkbox value="that">Check that out</b-form-checkbox>
        </b-form-checkbox-group>
      </b-form-group>
      <b-button type="submit" variant="primary">Submit</b-button>
      <b-button type="reset" variant="danger">Reset</b-button>
    </b-form>
  </div>
</template>

<script>
export default {
  data () {
    return {
      form: {
        email: '',
        name: '',
        food: null,
        checked: []
      },
      foods: [
        { text: 'Select One', value: null },
        'Carrots', 'Beans', 'Tomatoes', 'Corn'
      ],
      show: true
    }
  },
  methods: {
    onSubmit (evt) {
      evt.preventDefault();
      alert(JSON.stringify(this.form));
    },
    onReset (evt) {
      evt.preventDefault();
      /* Reset our form values */
      this.form.email = '';
      this.form.name = '';
      this.form.food = null;
      this.form.checked = [];
      /* Trick to reset/clear native browser form validation state */
      this.show = false;
      this.$nextTick(() => { this.show = true });
    }
  }
}
</script>

<!-- b-form-1.vue -->

Inline form

Use the inline prop on <b-form> to display a series of labels, form controls, and buttons on a single horizontal row. Form controls within inline forms vary slightly from their default states.

• Controls are display: flex, collapsing any HTML white space and allowing you to provide alignment control with spacing and flexbox utilities.
• Controls and input groups receive width: auto to override the Bootstrap default width: 100%.
• Controls only appear inline in viewports that are at least 576px wide to account for narrow viewports on mobile devices.

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 .sr-only.

<template>
  <div>
    <b-form inline>
      <label class="sr-only" for="inlineFormInputName2">Name</label>
      <b-input class="mb-2 mr-sm-2 mb-sm-0" id="inlineFormInputName2" placeholder="Jane Doe" />
      <label class="sr-only" for="inlineFormInputGroupUsername2">Username</label>
      <b-input-group left="@" class="mb-2 mr-sm-2 mb-sm-0">
        <b-input id="inlineFormInputGroupUsername2" placeholder="Username" />
      </b-input-group>
      <b-form-checkbox class="mb-2 mr-sm-2 mb-sm-0">Remember me</b-form-checkbox>
      <b-button variant="primary">Save</b-button>
    </b-form>
  </div>
</template>

<!-- b-form-inline-1.vue -->

Custom form controls and selects are also supported.

<template>
  <div>
    <b-form inline>
      <label class="mr-sm-2" for="inlineFormCustomSelectPref">Preference</label>
      <b-form-select class="mb-2 mr-sm-2 mb-sm-0"
                     :value="null"
                     :options="{ '1': 'One', '2': 'Two', '3': 'Three' }"
                     id="inlineFormCustomSelectPref">
        <option slot="first" :value="null">Choose...</option>
      </b-form-select>
      <b-form-checkbox class="mb-2 mr-sm-2 mb-sm-0">
        Remember my preference
      </b-form-checkbox>
      <b-button variant="primary">Save</b-button>
    </b-form>
  </div>
</template>

<!-- b-form-inline-2.vue -->

Note: <b-form-group> is not supported in inline forms due to layout conflicts.

Alternatives to hidden labels

Assistive technologies such as screen readers will have trouble with your forms if you don’t include a label for every input. For these inline forms, you can hide the labels using the .sr-only class. There are further alternative methods of providing a label for assistive technologies, such as the aria-label, aria-labelledby or title attributes. If none of these are present, assistive technologies may resort to using the placeholder attribute, if present, but note that use of placeholder as a replacement for other labelling methods is not advised.

Related Form Control Components

See also:

• <b-form-input> Textual and text-like inputs
• <b-form-textarea> Text area inputs
• <b-form-select> Select input
• <b-form-radio> Radio Inputs
• <b-form-checkbox> Checkbox Inputs
• <b-form-file> File Input
• <b-form-group> Form input wrapper to generate form-groups that support labels, help text and feedback
• <b-button> Buttons
• <b-input-group> Form inputs with add-ons

Helper components

• <b-form-row> create grid rows and columns with tighter margins
• <b-form-text> Help text blocks for inputs
• <b-form-invalid-feedback> Invalid feedback text blocks for input invalid states
• <b-form-valid-feedback> Valid feedback text blocks for input valid states

Validation

Disable browser native HTML5 validation by setting the novalidate prop to true on <b-form>.

Set the validated prop, on <b-form>, to true to add the Bootstrap V4 .was-validated class to the form to trigger validation states

Refer to the Bootstrap V4 Form Validation Documentation for details on the new Bootstrap V4 validation states.

Validation mechanisms

Documentation and examples (hopefully) coming soon.

Please see the following references:

• Bootstrap V4: Form Validation Documentation
• MDN: Learn Form Validation - Using JavaScript API
• MDN: HTML5 Constraint Validation
• MDN: Validity State API

Component Reference