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[Dart] Virtual Keyboard
source link: http://siongui.github.io/2017/01/29/dartlang-virtual-keypad/
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[Dart] Virtual Keyboard
January 29, 2017
Virtual kayboard/keypad in Dart programming language.
Real world application is Pāli Dictionary. There are special characters in romanized Pāli. For the convenience of input Pāli words, users can use the virtual keyboard to type Pāli word without installation of Pāli input method in computers
Source code:
index.html | repository | view raw
<!doctype html> <html> <head> <meta charset="utf-8"> <title>JavaScript Virtual Keypad Demo</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" type="text/css" href="keypad.css"> </head> <body> <input type="text" id="userinput"><br> <div class="keypad"></div> <script src="app.js"></script> </body> </html>
The logic in Dart code is simple:
- Create input element for each letter in Pāli alphabet.
- Listen to click event of the input element. In the callback of click event, add the corresponding Pāli letter to the user input.
app.dart | repository | view raw
import 'dart:html';
void main() {
InputElement word = querySelector("#userinput");
Element keypad = querySelector(".keypad");
var letters = [['q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p'],
['a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l'],
['z', 'x', 'c', 'v', 'b', 'n', 'm'],
['ā', 'ḍ', 'ī', 'ḷ', 'ṁ', 'ṃ', 'ñ', 'ṇ', 'ṭ', 'ū', 'ŋ', 'ṅ'] ];
for (var row = 0; row < letters.length; row++) {
var divElm = new Element.tag('div');
for (var i = 0; i < letters[row].length; i++) {
var inputElm = new InputElement();
inputElm.type = 'button';
inputElm.value = letters[row][i];
inputElm.onClick.listen((e) => word.value += e.target.value);
divElm.children.add(inputElm);
}
keypad.children.add(divElm);
}
}
.keypad {
position: absolute;
border: 1px solid #ccc;
padding: 10px;
cursor: move;
z-index: 21;
text-align: center;
background-color: #F0F8FF;
}
.keypad > div {
display: block;
}
For plain JavaScript version, see [3].
Tested on: DartPad.
References:
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