我在每行中創建了一個包含三個鏈接的HTML表格。我的目標是在用戶(1)懸停在其上或(2)通過按選項卡輸入鏈接時突出顯示一行。我還想確保一次僅突出顯示一行。這裏是我的HTML的一個簡化版本(show.htm):如何防止onfocus後自動onmouseover?
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<script type="text/javascript" src="show.js"></script>
<link rel="stylesheet" type="text/css" href="show.css"/>
</head>
<body>
<h2>Basic Information:</h2>
<table>
<tr class="data">
<td>London:</td>
<td><a href="http://example.com/london_001.htm">Part 1</a></td>
<td><a href="http://example.com/london_002.htm">Part 2</a></td>
<td><a href="http://example.com/london_003.htm">Part 3</a></td>
</tr>
<tr class="data">
<td>New York:</td>
<td><a href="http://example.com/newyork_001.htm">Part 1</a></td>
<td><a href="http://example.com/newyork_002.htm">Part 2</a></td>
<td><a href="http://example.com/newyork_003.htm">Part 3</a></td>
</tr>
<tr class="data">
<td>Tokyo:</td>
<td><a href="http://example.com/tokyo_001.htm">Part 1</a></td>
<td><a href="http://example.com/tokyo_002.htm">Part 2</a></td>
<td><a href="http://example.com/tokyo_003.htm">Part 3</a></td>
</tr>
<tr class="data">
<td>Rio de Janeiro:</td>
<td><a href="http://example.com/riodejaneiro_001.htm">Part 1</a></td>
<td><a href="http://example.com/riodejaneiro_002.htm">Part 2</a></td>
<td><a href="http://example.com/riodejaneiro_003.htm">Part 3</a></td>
</tr>
<tr class="data">
<td>Melbourne:</td>
<td><a href="http://example.com/melbourne_001.htm">Part 1</a></td>
<td><a href="http://example.com/melbourne_002.htm">Part 2</a></td>
<td><a href="http://example.com/melbourne_003.htm">Part 3</a></td>
</tr>
</table>
</body>
</html>
這裏是JavaScript(show.js):
window.onload = function(){
var rows = document.getElementsByClassName('data');
var links = document.getElementsByTagName('a');
var len = rows.length;
var old_index = -1;
var set_color = function(index, color){
return function(){
if(index !== old_index){
if(old_index !== -1){
rows[old_index].style.backgroundColor = null;
}
rows[index].style.backgroundColor = color;
old_index = index;
}
}
}
var i, j;
for(i = 0; i < len; i++){
rows[i].onmouseover = set_color(i, '#FFFFBB');
rows[i].onmouseout = set_color(i, null);
for(j = 0; j < 3; j++){
links[i*3+j].onfocus = set_color(i, '#FFFFBB');
links[i*3+j].onblur = set_color(i, null);
}
}
}
最後,這裏是CSS (show.css):
table{
margin:auto;
width:98%;
border-collapse:collapse;
border:none;
}
td{
border-top:1px solid gray;
border-bottom:1px solid gray;
border-left:none;
border-right:none;
vertical-align:center;
font-weight:bold;
}
.data{
background-color:rgba(120, 120, 240, 0.4);
font-family:Tahoma;
font-size:16px;
}
.data>td{
padding:6px 16px;
}
每當加載頁面時,我按選項卡,第一個鏈接接收焦點,但鼠標指針所在行(不一定是第一行)被突出顯示。看起來onmouseover
事件在onfocus
之後立即觸發,即使實際上沒有鼠標移動。如何解決這個問題(不使用任何外部庫,如JQuery)?任何幫助將不勝感激。
更新:
我已經爲了檢測實際的鼠標移動(借用尼克公牛的答案的想法)修改了我的Javascript代碼。但問題依然存在。我需要進一步的幫助。
window.onload = function(){
var rows = document.getElementsByClassName('data');
var links = document.getElementsByTagName('a');
var len = rows.length;
var old_index = -1;
var old_coords = {X:event.screenX, Y:event.screenY};
var set_color = function(index, color, keyboard_event){
return function(){
if(keyboard_event || event.screenX !== old_coords.X || event.screenY !== old_coords.Y){
if(index !== old_index){
if(old_index !== -1){
rows[old_index].style.backgroundColor = null;
}
rows[index].style.backgroundColor = color;
old_index = index;
if(!keyboard_event){
old_coords.X = event.screenX;
old_coords.Y = event.screenY;
}
}
}
}
}
var i, j;
for(i = 0; i < len; i++){
rows[i].onmouseover = set_color(i, '#FFFFBB', false);
rows[i].onmouseout = set_color(i, null, false);
for(j = 0; j < 3; j++){
links[i*3+j].onfocus = set_color(i, '#FFFFBB', true);
links[i*3+j].onblur = set_color(i, null, true);
}
}
}
文件加載:
第一片被壓:
如果我爲此,'onmouseover'不具有其期望的效果,即改變懸停的行的背景色。 –
爲什麼不呢?如果最後一個'onmouseover'事件的座標與前一個'ommouseover'事件不一致,就會發生。 –
@SharanyaDutta向JS添加了一條評論,以幫助您瞭解決策發生的位置。 –