MD Downloads: make Ctrl+f invoke in-page search

ui/webui/resources/cr_elements/cr_search_field/cr_search_field.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @interface */
 var SearchFieldDelegate = function() {};
 
 SearchFieldDelegate.prototype = {
   /**
    * @param {string} value
    */
   onSearchTermSearch: assertNotReached,
 };
 
 var SearchField = Polymer({
   is: 'cr-search-field',
 
   properties: {
     label: {
       type: String,
       value: '',
     },
 
     clearLabel: {
       type: String,
       value: '',
     },
 
-    showingSearch_: {
+    showingSearch: {
       type: Boolean,
       value: false,
+      observer: 'showingSearchChanged_',
     },
   },
 
-  /** @param {SearchFieldDelegate} delegate */
-  setDelegate: function(delegate) {
-    this.delegate_ = delegate;
+  focus: function() {
+    this.$$('#search-input').focus();
   },
 
   /**
    * Returns the value of the search field.
    * @return {string}
    */
   getValue: function() {
     var searchInput = this.$$('#search-input');
     return searchInput ? searchInput.value : '';
   },
 
+  /** @param {SearchFieldDelegate} delegate */
+  setDelegate: function(delegate) {
+    this.delegate_ = delegate;
+  },
+
   /** @private */
   onSearchTermSearch_: function() {
     if (this.delegate_)
       this.delegate_.onSearchTermSearch(this.getValue());
   },
 
   /** @private */
   onSearchTermKeydown_: function(e) {
-    assert(this.showingSearch_);
     if (e.keyIdentifier == 'U+001B')  // Escape.
-      this.toggleShowingSearch_();
+      this.showingSearch = false;
   },
 
   /** @private */
-  toggleShowingSearch_: function() {
-    this.showingSearch_ = !this.showingSearch_;
+  showingSearchChanged_: function() {
     this.async(function() {
       var searchInput = this.$$('#search-input');
-      if (this.showingSearch_) {
+
+      if (!searchInput)
+        return;
+
+      if (this.showingSearch) {
         searchInput.focus();

[Dan Beam, 2016/01/21 22:14:46]

^ this is why the code was still working, but I also want to re-focus the search
input if it's already showing and the user presses Ctrl+f

[michaelpg, 2016/01/21 22:19:01]

right. Maybe just do that in focus() though:

this.showingSearch = true;
this.async(fn(){...});

       } else {
         searchInput.value = '';
         this.onSearchTermSearch_();
       }
     });
   },
+
+  /** @private */
+  toggleShowingSearch_: function() {
+    this.showingSearch = !this.showingSearch;
+  },
 });