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1 <!-- | |
2 @license | |
3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved. | |
4 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt | |
5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt | |
6 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt | |
7 Code distributed by Google as part of the polymer project is also | |
8 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt | |
9 --> | |
10 | |
11 <link rel="import" href="../polymer/polymer.html"> | |
12 <link rel="import" href="../iron-flex-layout/classes/iron-flex-layout.html"> | |
13 <link rel="import" href="../iron-validatable-behavior/iron-validatable-behavior.
html"> | |
14 | |
15 <!-- | |
16 `iron-autogrow-textarea` is an element containing a textarea that grows in heigh
t as more | |
17 lines of input are entered. Unless an explicit height or the `maxRows` property
is set, it will | |
18 never scroll. | |
19 | |
20 Example: | |
21 | |
22 <iron-autogrow-textarea id="a1"> | |
23 <textarea id="t1"></textarea> | |
24 </iron-autogrow-textarea> | |
25 | |
26 Because the `textarea`'s `value` property is not observable, you should use | |
27 this element's `bind-value` instead for imperative updates. | |
28 | |
29 @group Iron Elements | |
30 @hero hero.svg | |
31 @demo demo/index.html | |
32 --> | |
33 | |
34 <dom-module id="iron-autogrow-textarea"> | |
35 | |
36 <style> | |
37 :host { | |
38 display: inline-block; | |
39 position: relative; | |
40 width: 400px; | |
41 border: 1px solid; | |
42 padding: 2px; | |
43 -moz-appearance: textarea; | |
44 -webkit-appearance: textarea; | |
45 } | |
46 | |
47 .mirror-text { | |
48 visibility: hidden; | |
49 word-wrap: break-word; | |
50 } | |
51 | |
52 textarea { | |
53 position: relative; | |
54 outline: none; | |
55 border: none; | |
56 resize: none; | |
57 background: inherit; | |
58 /* see comments in template */ | |
59 width: 100%; | |
60 height: 100%; | |
61 font-size: inherit; | |
62 font-family: inherit; | |
63 } | |
64 | |
65 ::content textarea:invalid { | |
66 box-shadow: none; | |
67 } | |
68 | |
69 </style> | |
70 <template> | |
71 <!-- the mirror sizes the input/textarea so it grows with typing --> | |
72 <div id="mirror" class="mirror-text" aria-hidden="true"> </div> | |
73 | |
74 <!-- size the input/textarea with a div, because the textarea has intrinsic
size in ff --> | |
75 <div class="textarea-container fit"> | |
76 <textarea id="textarea" required$="[[required]]" rows$="[[rows]]" maxlengt
h$="[[maxlength]]"></textarea> | |
77 </div> | |
78 </template> | |
79 | |
80 <script> | |
81 | |
82 Polymer({ | |
83 | |
84 is: 'iron-autogrow-textarea', | |
85 | |
86 behaviors: [ | |
87 Polymer.IronValidatableBehavior | |
88 ], | |
89 | |
90 properties: { | |
91 | |
92 /** | |
93 * Use this property instead of `value` for two-way data binding. | |
94 */ | |
95 bindValue: { | |
96 observer: '_bindValueChanged', | |
97 type: String | |
98 }, | |
99 | |
100 /** | |
101 * The initial number of rows. | |
102 * | |
103 * @attribute rows | |
104 * @type number | |
105 * @default 1 | |
106 */ | |
107 rows: { | |
108 type: Number, | |
109 value: 1, | |
110 observer: '_updateCached' | |
111 }, | |
112 | |
113 /** | |
114 * The maximum number of rows this element can grow to until it | |
115 * scrolls. 0 means no maximum. | |
116 * | |
117 * @attribute maxRows | |
118 * @type number | |
119 * @default 0 | |
120 */ | |
121 maxRows: { | |
122 type: Number, | |
123 value: 0, | |
124 observer: '_updateCached' | |
125 }, | |
126 | |
127 /** | |
128 * Set to true to mark the textarea as required. | |
129 */ | |
130 required: { | |
131 type: Boolean | |
132 }, | |
133 | |
134 /** | |
135 * The maximum length of the input value. | |
136 */ | |
137 maxlength: { | |
138 type: Number | |
139 } | |
140 | |
141 }, | |
142 | |
143 listeners: { | |
144 'input': '_onInput' | |
145 }, | |
146 | |
147 /** | |
148 * Returns the underlying textarea. | |
149 */ | |
150 get textarea() { | |
151 return this.$.textarea; | |
152 }, | |
153 | |
154 _update: function() { | |
155 this.$.mirror.innerHTML = this._valueForMirror(); | |
156 | |
157 var textarea = this.textarea; | |
158 // If the value of the textarea was updated imperatively, then we | |
159 // need to manually update bindValue as well. | |
160 if (textarea && this.bindValue != textarea.value) { | |
161 this.bindValue = textarea.value; | |
162 } | |
163 }, | |
164 | |
165 _bindValueChanged: function() { | |
166 var textarea = this.textarea; | |
167 if (!textarea) { | |
168 return; | |
169 } | |
170 | |
171 textarea.value = this.bindValue; | |
172 this._update(); | |
173 // manually notify because we don't want to notify until after setting val
ue | |
174 this.fire('bind-value-changed', {value: this.bindValue}); | |
175 }, | |
176 | |
177 _onInput: function(event) { | |
178 this.bindValue = event.path ? event.path[0].value : event.target.value; | |
179 this._update(); | |
180 }, | |
181 | |
182 _constrain: function(tokens) { | |
183 var _tokens; | |
184 tokens = tokens || ['']; | |
185 // Enforce the min and max heights for a multiline input to avoid measurem
ent | |
186 if (this.maxRows > 0 && tokens.length > this.maxRows) { | |
187 _tokens = tokens.slice(0, this.maxRows); | |
188 } else { | |
189 _tokens = tokens.slice(0); | |
190 } | |
191 while (this.rows > 0 && _tokens.length < this.rows) { | |
192 _tokens.push(''); | |
193 } | |
194 return _tokens.join('<br>') + ' '; | |
195 }, | |
196 | |
197 _valueForMirror: function() { | |
198 var input = this.textarea; | |
199 if (!input) { | |
200 return; | |
201 } | |
202 this.tokens = (input && input.value) ? input.value.replace(/&/gm, '&')
.replace(/"/gm, '"').replace(/'/gm, ''').replace(/</gm, '<').replace
(/>/gm, '>').split('\n') : ['']; | |
203 return this._constrain(this.tokens); | |
204 }, | |
205 | |
206 _updateCached: function() { | |
207 this.$.mirror.innerHTML = this._constrain(this.tokens); | |
208 } | |
209 }) | |
210 </script> | |
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