javascript 如何从 Android 移动设备键盘获取 keyCodes?
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How to get keyCodes from Android mobile device keyboard?
提问by Arya
Currently, I am facing a problem on a mobile device. I have an input field where only some keys are allowed to be pressed: e.g. only the numbers 0–9. It works fantastic on a web browser. But when I open it in my Android mobile device it fails.
目前,我在移动设备上遇到了问题。我有一个输入字段,其中只允许按下某些键:例如,只有数字 0–9。它在网络浏览器上工作得很好。但是当我在我的 Android 移动设备中打开它时,它失败了。
I have used keyup
and keypress
. keyup
is working but I want to know which key fired the event from the mobile keyboard. How would I get that?
我用过keyup
和keypress
。keyup
正在工作,但我想知道哪个键从移动键盘触发了事件。我怎么会得到那个?
回答by Juned Lanja
I'm using a array that has maping to all keyboard keys with keycode at given index and then on element's keydown i'm checking whether its allowed key or not, because in mobile some keyboard key will have the same code as numeric key's keycode so it will allow that keys.
我正在使用一个数组,该数组在给定索引处使用键码映射到所有键盘键,然后在元素的键下我正在检查它是否允许键,因为在移动设备中,某些键盘键将与数字键的键码具有相同的代码,所以它将允许该键。
So i'm using following to prevent that situation.
所以我正在使用以下内容来防止这种情况。
//keyboard maping array
var keyboardMap = ["", "", "", "CANCEL", "", "", "HELP", "", "BACK_SPACE", "TAB", "", "", "CLEAR", "ENTER", "RETURN", "", "SHIFT", "CONTROL", "ALT", "PAUSE", "CAPS_LOCK", "KANA", "EISU", "JUNJA", "FINAL", "HANJA", "", "ESCAPE", "CONVERT", "NONCONVERT", "ACCEPT", "MODECHANGE", "SPACE", "PAGE_UP", "PAGE_DOWN", "END", "HOME", "LEFT", "UP", "RIGHT", "DOWN", "SELECT", "PRINT", "EXECUTE", "PRINTSCREEN", "INSERT", "DELETE", "", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "COLON", "SEMICOLON", "LESS_THAN", "EQUALS", "GREATER_THAN", "QUESTION_MARK", "AT", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "WIN", "", "CONTEXT_MENU", "", "SLEEP", "NUMPAD0", "NUMPAD1", "NUMPAD2", "NUMPAD3", "NUMPAD4", "NUMPAD5", "NUMPAD6", "NUMPAD7", "NUMPAD8", "NUMPAD9", "MULTIPLY", "ADD", "SEPARATOR", "SUBTRACT", "DECIMAL", "DIVIDE", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15", "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23", "F24", "", "", "", "", "", "", "", "", "NUM_LOCK", "SCROLL_LOCK", "WIN_OEM_FJ_JISHO", "WIN_OEM_FJ_MASSHOU", "WIN_OEM_FJ_TOUROKU", "WIN_OEM_FJ_LOYA", "WIN_OEM_FJ_ROYA", "", "", "", "", "", "", "", "", "", "CIRCUMFLEX", "EXCLAMATION", "DOUBLE_QUOTE", "HASH", "DOLLAR", "PERCENT", "AMPERSAND", "UNDERSCORE", "OPEN_PAREN", "CLOSE_PAREN", "ASTERISK", "PLUS", "PIPE", "HYPHEN_MINUS", "OPEN_CURLY_BRACKET", "CLOSE_CURLY_BRACKET", "TILDE", "", "", "", "", "VOLUME_MUTE", "VOLUME_DOWN", "VOLUME_UP", "", "", "", "", "COMMA", "", "PERIOD", "SLASH", "BACK_QUOTE", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "OPEN_BRACKET", "BACK_SLASH", "CLOSE_BRACKET", "QUOTE", "", "META", "ALTGR", "", "WIN_ICO_HELP", "WIN_ICO_00", "", "WIN_ICO_CLEAR", "", "", "WIN_OEM_RESET", "WIN_OEM_JUMP", "WIN_OEM_PA1", "WIN_OEM_PA2", "WIN_OEM_PA3", "WIN_OEM_WSCTRL", "WIN_OEM_CUSEL", "WIN_OEM_ATTN", "WIN_OEM_FINISH", "WIN_OEM_COPY", "WIN_OEM_AUTO", "WIN_OEM_ENLW", "WIN_OEM_BACKTAB", "ATTN", "CRSEL", "EXSEL", "EREOF", "PLAY", "ZOOM", "", "PA1", "WIN_OEM_CLEAR", ""];
//Allowed keys as per your requirement
var allowedKey = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "NUMPAD0", "NUMPAD1", "NUMPAD2", "NUMPAD3", "NUMPAD4", "NUMPAD5", "NUMPAD6", "NUMPAD7", "NUMPAD8", "NUMPAD9", "DELETE", "BACK_SPACE", "DECIMAL", "LEFT", "RIGHT", "TAB", "SUBTRACT", "PERIOD"];
//bind keydown to your element
element.on("keydown", function (e) {
var key = e.charCode || e.keyCode || 0;
var keyValue = keyboardMap[key];
if ($.inArray(keyValue, allowedKey) !== -1){
return true;
}
else{
return false;
}
}
It's working for me hope so it will work for you also.
它对我有用,希望对你也有用。