opnform/client/components/forms/SignatureInput.vue

<template>
  <input-wrapper
    v-bind="inputWrapperProps"
  >
    <template #label>
      <slot name="label" />
    </template>

    <VueSignaturePad ref="signaturePad"
                     :class="[theme.default.input,{ '!ring-red-500 !ring-2': hasError, '!cursor-not-allowed !bg-gray-200':disabled }]"
                     height="150px"
                     :name="name"
                     :options="{ onEnd }"
    />

    <template #bottom_after_help>
      <small :class="theme.default.help">
        <a :class="theme.default.help" href="#" @click.prevent="clear">Clear</a>
      </small>
    </template>

    <template #error>
      <slot name="error" />
    </template>
  </input-wrapper>
</template>

<script>
import { inputProps, useFormInput } from './useFormInput.js'
import InputWrapper from './components/InputWrapper.vue'
import { VueSignaturePad } from 'vue-signature-pad'

export default {
  name: 'SignatureInput',
  components: { InputWrapper, VueSignaturePad },

  props: {
    ...inputProps
  },

  setup (props, context) {
    return {
      ...useFormInput(props, context)
    }
  },

  methods: {
    clear () {
      this.$refs.signaturePad.clearSignature()
      this.onEnd()
    },
    onEnd () {
      if (this.disabled) {
        this.$refs.signaturePad.clearSignature()
      } else {
        const { isEmpty, data } = this.$refs.signaturePad?.saveSignature()
        this.form[this.name] = (!isEmpty && data) ? data : null
      }
    }
  }
}
</script>