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nova/resources/js/components/Form/KeyValueField/KeyValueField.vue

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+<template>
+  <default-field
+    :field="field"
+    :errors="errors"
+    :full-width-content="true"
+    :show-help-text="showHelpText"
+  >
+    <template slot="field">
+      <KeyValueTable
+        :edit-mode="!field.readonly"
+        :can-delete-row="field.canDeleteRow"
+      >
+        <KeyValueHeader
+          :key-label="field.keyLabel"
+          :value-label="field.valueLabel"
+        />
+
+        <div class="bg-white overflow-hidden key-value-items">
+          <KeyValueItem
+            v-for="(item, index) in theData"
+            :index="index"
+            @remove-row="removeRow"
+            :item.sync="item"
+            :key="item.id"
+            :ref="item.id"
+            :read-only="field.readonly"
+            :read-only-keys="field.readonlyKeys"
+            :can-delete-row="field.canDeleteRow"
+          />
+        </div>
+      </KeyValueTable>
+
+      <div
+        class="mr-11"
+        v-if="!field.readonly && !field.readonlyKeys && field.canAddRow"
+      >
+        <button
+          @click="addRowAndSelect"
+          :dusk="`${field.attribute}-add-key-value`"
+          type="button"
+          class="btn btn-link dim cursor-pointer rounded-lg mx-auto text-primary mt-3 px-3 rounded-b-lg flex items-center"
+        >
+          <icon type="add" width="24" height="24" view-box="0 0 24 24" />
+          <span class="ml-1">{{ field.actionText }}</span>
+        </button>
+      </div>
+    </template>
+  </default-field>
+</template>
+
+<script>
+import { FormField, HandlesValidationErrors } from 'laravel-nova'
+import KeyValueItem from '@/components/Form/KeyValueField/KeyValueItem'
+import KeyValueHeader from '@/components/Form/KeyValueField/KeyValueHeader'
+import KeyValueTable from '@/components/Form/KeyValueField/KeyValueTable'
+
+function guid() {
+  var S4 = function () {
+    return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1)
+  }
+  return (
+    S4() +
+    S4() +
+    '-' +
+    S4() +
+    '-' +
+    S4() +
+    '-' +
+    S4() +
+    '-' +
+    S4() +
+    S4() +
+    S4()
+  )
+}
+
+export default {
+  mixins: [HandlesValidationErrors, FormField],
+
+  components: { KeyValueTable, KeyValueHeader, KeyValueItem },
+
+  data: () => ({ theData: [] }),
+
+  mounted() {
+    this.theData = _.map(this.value || {}, (value, key) => ({
+      id: guid(),
+      key: `${key}`,
+      value,
+    }))
+
+    if (this.theData.length == 0) {
+      this.addRow()
+    }
+  },
+
+  methods: {
+    /**
+     * Provide a function that fills a passed FormData object with the
+     * field's internal value attribute.
+     */
+    fill(formData) {
+      formData.append(this.field.attribute, JSON.stringify(this.finalPayload))
+    },
+
+    /**
+     * Add a row to the table.
+     */
+    addRow() {
+      return _.tap(guid(), id => {
+        this.theData = [...this.theData, { id, key: '', value: '' }]
+        return id
+      })
+    },
+
+    /**
+     * Add a row to the table and select its first field.
+     */
+    addRowAndSelect() {
+      return this.selectRow(this.addRow())
+    },
+
+    /**
+     * Remove the row from the table.
+     */
+    removeRow(id) {
+      return _.tap(
+        _.findIndex(this.theData, row => row.id == id),
+        index => this.theData.splice(index, 1)
+      )
+    },
+
+    /**
+     * Select the first field in a row with the given ref ID.
+     */
+    selectRow(refId) {
+      return this.$nextTick(() => {
+        this.$refs[refId][0].$refs.keyField.select()
+      })
+    },
+  },
+
+  computed: {
+    /**
+     * Return the final filtered json object
+     */
+    finalPayload() {
+      return _(this.theData)
+        .map(row => (row && row.key ? [row.key, row.value] : undefined))
+        .reject(row => row === undefined)
+        .fromPairs()
+        .value()
+    },
+  },
+}
+</script>