Merge pull request #395 from dod-ccpo/dropdown-keyboard-access

Dropdown selector keyboard accessibility

js/components/selector.js

@@ -1,10 +1,46 @@
 import { VPopover } from 'v-tooltip'
 
+const SelectorInput = {
+  name: 'SelectorInput',
+  props: {
+    name: String,
+    value: String,
+    label: String,
+    description: String,
+    selected: Boolean,
+    handleChange: Function,
+    handleEnter: Function,
+    handleEsc: Function
+  },
+
+  computed: {
+    id: function () {
+      return `${this.name}_${this.value}`
+    }
+  },
+
+  methods: {
+    onChange: function (e) {
+      this.handleChange(this.value)
+    },
+
+    onEnter: function (e) {
+      this.handleEnter()
+    },
+
+    onEsc: function (e) {
+      this.handleEsc()
+    }
+  }
+}
+
+
 export default {
   name: 'selector',
 
   components: {
-    VPopover
+    VPopover,
+    SelectorInput
   },
 
   props: {
@@ -20,7 +56,9 @@ export default {
   data: function () {
     return {
       value: this.initialChoice || null,
-      showError: (this.initialErrors && this.initialErrors.length) || false
+      currentChoice: this.initialChoice || null,
+      showError: (this.initialErrors && this.initialErrors.length) || false,
+      usingKeyboard: false
     }
   },
 
@@ -38,10 +76,38 @@ export default {
   },
 
   methods: {
-    change: function (e) {
-      this.value = e.target.value
+
+    change: function (value) {
+      this.value = value
       this.showError = false
-      setTimeout(() => this.$refs.popover.hide(), 300)
+    },
+
+    onShow: function () {
+      setTimeout(() => { // timeout is a hack to make focus work in Chrome
+        this.$refs.choices.find(choice => choice.selected).$refs.input[0].focus()
+      }, 100)
+    },
+
+    enter: function () {
+      this.$refs.popover.hide()
+    },
+
+    esc: function () {
+      this.value = this.currentChoice
+      this.usingKeyboard = false
+      this.$refs.popover.hide()
+    },
+
+    handleEnterOption: function (e) {
+      this.change(e.target.value)
+      this.currentChoice = e.target.value
+      this.usingKeyboard = false
+      this.$refs.popover.hide()
+    },
+
+    handleButtonArrowDown: function (e) {
+      this.usingKeyboard = true
+      this.$refs.popover.show()
     }
   },
 }

styles/elements/_block_lists.scss

@@ -68,6 +68,24 @@
   }
 }
 
+@mixin block-list-selectable-label {
+  margin: 0;
+  max-width: 100%;
+  display: flex;
+  flex-direction: row-reverse;
+  align-items: center;
+  justify-content: space-between;
+  &::before {
+    flex-shrink: 0;
+    margin-right: 0;
+    margin-left: $gap * 2;
+  }
+
+  &:hover {
+    color: $color-primary;
+  }
+}
+
 
 .block-list {
   @include block-list;
@@ -105,24 +123,23 @@
   @include block-list-item;
 
   &.block-list__item--selectable {
-    > label {
-      margin: 0;
-      max-width: none;
+    > div {
       display: flex;
       flex-direction: row-reverse;
-      align-items: center;
-      justify-content: space-between;
-      &::before {
-        flex-shrink: 0;
-        margin-right: 0;
-        margin-left: $gap * 2;
+
+      @include ie-only {
+        width: 100%;
       }
 
-      &:hover {
-        color: $color-primary;
+      > label {
+        @include block-list-selectable-label;
       }
     }
 
+    > label {
+      @include block-list-selectable-label;
+    }
+
     input:checked {
       + label {
         color: $color-primary;

templates/components/selector.html

@@ -11,7 +11,7 @@
   inline-template>
 
   <fieldset v-bind:class="['selector usa-input', { 'usa-input--error': initialErrors }]">
-    <v-popover v-bind:container='false' ref='popover'>
+    <v-popover v-bind:container='false' ref='popover' v-on:show='onShow'>
       <legend>
         <div class="usa-input__title">{{ field.label | striptags }}</div>
 
@@ -22,7 +22,14 @@
         <span v-show='showError'>{{ Icon('alert',classes="icon-validation") }}</span>
       </legend>
 
-      <button class='selector__button' type='button' v-html='label'></button>
+      <button
+        class='selector__button'
+        type='button'
+        v-html='label'
+        v-on:keydown.down.prevent.stop='handleButtonArrowDown'
+        v-on:keydown.up.prevent.stop='handleButtonArrowDown'
+        v-tooltip='{ container:false }'>
+      </button>
 
       <span v-show='showError'>{{ Icon('alert',classes="icon-validation") }}</span>
 
@@ -35,23 +42,48 @@
       <template slot='popover'>
         <div class='block-list'>
           <ul>
-            <li v-for='choice in choices' class='block-list__item block-list__item--selectable'>
+            <li v-for='(choice, index) in choices' class='block-list__item block-list__item--selectable'>
               <template v-if='choice[0] !== ""'>
-                <input
-                  type='radio'
-                  v-bind:id="'{{ field.name }}_' + choice[0]"
+
+                <selector-input
+                  name="{{ field.name }}"
+                  ref='choices'
                   v-bind:value='choice[0]'
-                  v-bind:checked='value === choice[0]'
-                  v-on:change='change'/>
-                <label v-bind:for="'{{ field.name }}_' + choice[0]">
-                  <template v-if='choice[1].description'>
+                  v-bind:label='choice[1].name'
+                  v-bind:description='choice[1].description'
+                  v-bind:selected='value === choice[0]'
+                  v-bind:handle-change='change'
+                  v-bind:handle-enter='enter'
+                  v-bind:handle-esc='esc'
+                  inline-template>
+
+                  <div>
+                    <input
+                      ref='input'
+                      tabindex='0'
+                      type='radio'
+                      v-bind:name='name'
+                      v-bind:id='id'
+                      v-bind:value='value'
+                      v-bind:checked='selected'
+                      v-bind:autofocus='selected'
+                      v-on:change='onChange'
+                      v-on:keydown.enter.prevent.stop='onEnter'
+                      v-on:keydown.esc.prevent.stop='onEsc'/>
+
+                    <label v-bind:for='id'>
+                      <template v-if='description'>
                         <dl>
-                      <dt v-html='choice[1].name'></dt>
-                      <dd v-html='choice[1].description'></dd>
+                          <dt v-html='label'></dt>
+                          <dd v-html='description'></dd>
                         </dl>
                       </template>
-                  <span v-else v-html='choice[1].name'>
+                      <span v-else v-html='label'>
                     </label>
+                  </div>
+
+                </selector-input>
+
               </template>
             </li>
           </ul>