我实现一个自定义的下拉列表中,我有一个问题,当我移动通过键盘:悬停工作过,我不知道如何禁用它。我在这里粘贴了我的代码http://jsfiddle.net/4o0bcv1d/,但这里我的代码工作正确。当我将代码复制到index.html时 - 悬停再次运行,当我通过键盘移动时。 我该如何解决它?禁用悬停时,按下键
var doc = document;
var keydown_count = -1;
var dropdown_content = doc.querySelector('.dropdown-content');
var dropdown_items = doc.querySelectorAll('.dropdown-item');
var dropdown_items_length = dropdown_items.length;
var clear_navigation_hover = function() {
for (var i = 0; i < dropdown_items_length; ++i) {
dropdown_items[i].classList.remove('dropdown-item--hover');
};
}
var navigation_hover_by_keydown = function (event) {
var event = event || event.window;
var UP = 38;
var DOWN = 40;
var SCROLL_STEP = 66;
if (event.keyCode === UP) {
keydown_count--;
if (keydown_count < 0) {
keydown_count = dropdown_items_length - 1;
dropdown_content.scrollTop = 66 * dropdown_items_length;
}
if (keydown_count < (dropdown_items_length - 3)) {
dropdown_content.scrollTop -= 66;
};
} else if (event.keyCode === DOWN) {
keydown_count++;
if (keydown_count >= dropdown_items_length) {
keydown_count = 0;
dropdown_content.scrollTop = 0;
}
if (keydown_count > 3) {
dropdown_content.scrollTop += 66;
};
}
clear_navigation_hover();
dropdown_items[keydown_count].classList.add('dropdown-item--hover');
}
var dropdown_input = doc.querySelector('.dropdown-input');
dropdown_input.addEventListener('keydown', navigation_hover_by_keydown, false);
var navigation_hover_by_hover = function() {
clear_navigation_hover();
this.classList.add('dropdown-item--hover');
keydown_count = this.getAttribute('data-index');
console.log('hover');
}
for (var i = 0; i < dropdown_items_length; ++i) {
dropdown_items[i].addEventListener('mouseover', navigation_hover_by_hover, false);
}