[英]Using keycodes for '+' and '-'
Hi I have the following code in my Cesium project and would like to know how I can use other keys other than the characters. 嗨,我在Cesium项目中有以下代码,并且想知道如何使用除字符以外的其他键。 Here is what I have at the minute: 这是我目前的情况:
function getFlagForKeyCode(keyCode) {
switch (keyCode) {
case 'W'.charCodeAt(0):
return 'moveForward';
case 'S'.charCodeAt(0):
return 'moveBackward';
case 'Q'.charCodeAt(0):
return 'moveUp';
case 'E'.charCodeAt(0):
return 'moveDown';
case 'D'.charCodeAt(0):
return 'moveRight';
case 'A'.charCodeAt(0):
return 'moveLeft';
default:
return undefined;
}
} }
I want to be able to use the - and + keys. 我希望能够使用-和+键。 How can I achieve this? 我该如何实现?
If your keyCode
comes from keyup/keydown event, you need to do something like this: 如果您的keyCode
来自keyup / keydown事件,则需要执行以下操作:
document.addEventListener("keydown", function(e){
if ((e.shiftKey && e.keyCode == 187) || e.keyCode == 107) {
e.keyCode = 43; // 43 - char code for "+"
}
if (e.keyCode == 189 || e.keyCode == 109) {
e.keyCode = 45; // 45 - char code for "-"
}
getFlagForKeyCode(e.keyCode);
}, false);
And extend your getFlagForKeyCode
function 并扩展您的getFlagForKeyCode
函数
function getFlagForKeyCode (keyCode) {
switch (keyCode) {
case 'W'.charCodeAt(0):
return 'moveForward';
case 'S'.charCodeAt(0):
return 'moveBackward';
case 'Q'.charCodeAt(0):
return 'moveUp';
case 'E'.charCodeAt(0):
return 'moveDown';
case 'D'.charCodeAt(0):
return 'moveRight';
case 'A'.charCodeAt(0):
return 'moveLeft';
case '+'.charCodeAt(0):
// return what you need
case '-'.charCodeAt(0):
// return what you need
default:
return undefined;
}
}
Up, down, left and right use the arrow keys which are codes 37-40 and the + and - keys are 187 and 189: 向上,向下,向左和向右使用箭头键(代码37-40),而+和-键分别为187和189:
function getFlagForKeyCode(keyCode) {
switch (keyCode) {
case 187:
return 'moveForward';
case 189:
return 'moveBackward';
case 38:
return 'moveUp';
case 40:
return 'moveDown';
case 39:
return 'moveRight';
case 37:
return 'moveLeft';
default:
return undefined;
}
} }
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