javascript jQuery 处理按键组合
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jQuery handling keypress combinations
提问by Gaurav
I know that when keypressevent occurs then we can access which key is pressed by object's event property keycode, but I need to know how do we can handle keypresscombinations through jQuery like ctrl + D..etc?
我知道当keypress事件发生时，我们可以访问对象的事件属性按下了哪个键keycode，但我需要知道我们如何keypress通过 jQuery处理组合，例如ctrl + D..etc？
In the following code I tried to do something like :
在以下代码中，我尝试执行以下操作：
$(document).on("keypress", function(e) {
if( /* what condition i can give here */ )
alert("you pressed cntrl + Del");
});
回答by Sampson
jQuery already handles this for you:
jQuery 已经为你处理了这个：
if ( e.ctrlKey && ( e.which === 46 ) ) {
console.log( "You pressed CTRL + Del" );
}
回答by Vaxo Basilidze
I know that this is an old question that has already been answered, but the answer marked as correct did not work for me. Here is a simple and easy method for catching the key combinations I wrote:
我知道这是一个已经回答的老问题，但标记为正确的答案对我不起作用。这是一个简单易行的方法来捕捉我写的组合键：
NOTE:This example is catching ctrl + spacecombination, but you can easily change it to any other keys.
注意：此示例是捕获ctrl + space组合，但您可以轻松地将其更改为任何其他键。
var ctrlPressed = false; //Variable to check if the the first button is pressed at this exact moment
$(document).keydown(function(e) {
if (e.ctrlKey) { //If it's ctrl key
ctrlPressed = true; //Set variable to true
}
}).keyup(function(e) { //If user releases ctrl button
if (e.ctrlKey) {
ctrlPressed = false; //Set it to false
}
}); //This way you know if ctrl key is pressed. You can change e.ctrlKey to any other key code you want
$(document).keydown(function(e) { //For any other keypress event
if (e.which == 32) { //Checking if it's space button
if(ctrlPressed == true){ //If it's space, check if ctrl key is also pressed
myFunc(); //Do anything you want
ctrlPressed = false; //Important! Set ctrlPressed variable to false. Otherwise the code will work everytime you press the space button again
}
}
})
