Javascript 使用 jQuery 识别退格和空格键
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Recognize the backspace and spacebar with jQuery
提问by Michael Rader
when a user clicks the spacebar or backspace I need to create a variable that stores the action so I can use it to manipulate an array. I want the backspace to delete a value in an array and the spacebar to create a space. How can I do this?
当用户单击空格键或退格键时，我需要创建一个存储操作的变量，以便我可以使用它来操作数组。我希望退格键删除数组中的值，空格键创建一个空格。我怎样才能做到这一点？
回答by Saeed Neamati
Maybe this can help you:
也许这可以帮助你：
$('body').keyup(function(e){
if(e.keyCode == 8){
// user has pressed backspace
array.pop();
}
if(e.keyCode == 32){
// user has pressed space
array.push('');
}
});
回答by run
try this
尝试这个
$(document).ready( function() {
$('#inputid').bind('keypress', function(e) {
if (e.which == 32){//space bar
alert('space');
}
if (e.which == 8) {//backspace
alert('back space');
}
});
});
回答by Irvin Dominin
Try this fiddle: http://jsfiddle.net/gSWwp/1/
试试这个小提琴：http: //jsfiddle.net/gSWwp/1/
I call the method e.preventDefault(); for ignore the default event associated to the keypress for a field. http://api.jquery.com/event.preventDefault/
我调用方法 e.preventDefault(); 忽略与字段按键相关的默认事件。 http://api.jquery.com/event.preventDefault/
回答by Safeer Ahmed
It scrolled down the page!I wanted to use the space bar key to trigger a function as:
它向下滚动页面！我想使用空格键来触发一个函数：
$("#org").on("keydown", function(e){
if(e.keyCode == 32){
my_func();//The function executes but the page is scrolled down
}
});
Now I have changed the code and added return falseand it worked perfectly as I don't want space in typed word as well.
现在我已经更改了代码并添加了return false并且它工作得很好，因为我也不希望输入的单词中有空格。
$("#org").on("keydown", function(e){
if(e.keyCode == 32){
my_func();
return false;//to fix the scrolling down on space bar key press
}
});
