我的问题可能有点令人困惑，但我会尽力解释它。首先，我想告诉您，我是编程的初学者，所以我的问题可能听起来很愚蠢。请耐心等待...
我已经成功地使用 JavaScript 隐藏和显示 html 元素，但是，我注意到可见元素没有占据隐藏元素的位置。不知怎的，我明白该元素是存在的，但不仅仅是可见的。我怎样才能使可见元素重叠或占据隐藏元素的位置。
这 2 个元素是:
- div id="show_description"
- 输入类型=“提交”id=“send_notice”
代码如下:
index.php
<?php include('functions.php'); ?>
<?php session_start(); ?>
<?php
$yr = isset($_GET['year_list']) ? $_GET['year_list'] : null;
$evnt = isset($_GET['event_list']) ? $_GET['event_list'] : null;
?>
<html>
<head>
<script type="text/javascript" src="myscripts.js"></script>
<style type='text/css'>
#show_description {
min-height: 100px;
min-width: 500px;
max-height: 100px;
max-width: 500px;
background-color: #000;
color: #fff;
padding: 10px;
}
</style>
</head>
<body onload="check_year_event();">
<div>
<form name="myform" action="index.php" method="get" >
Select Year: <?php echo hspacer(1); ?>
<select id="year_list" name="year_list" onchange="check_year_event();" >
<?php
for($year = (date('Y') - 100); $year <= (date('Y') + 100); $year++ ) {
if ($year == date('Y')) echo "<option value='$year' name='$year' selected='' >" . $year . "</option>";
else echo "<option value='$year' name='$year' >" . $year . "</option>";
}
?>
</select>
<?php echo hspacer(5); ?>
Select Event: <?php echo hspacer(1); ?>
<select id="event_list" name="event_list" onchange="check_year_event();" >
<?php
$events = array("Karate Tournament", "Beauty Pageant", "Film Festival", "Singing Contest", "Wedding");
foreach($events as $event) echo "<option value='$event' name='$event' >" . $event . "</option>";
?>
</select>
<?php echo vspacer(2); echo hspacer(22); ?>
<input type="submit" id="send_notice" value="Send Notice" />
</form>
</div>
<div id="show_description" >
</div>
</body>
</html>
functions.php
<?php
function hspacer($num_of_spaces) {
$spaces = "";
if ($num_of_spaces > 0) for($i=0; $i<$num_of_spaces; $i++ ) $spaces .= " ";
return $spaces;
}
function vspacer($num_of_linefeeds) {
$linefeeds = "";
if ($num_of_linefeeds > 0) for($i=0; $i<$num_of_linefeeds; $i++ ) $linefeeds .= "<br />";
return $linefeeds;
}
?>
myscripts.js
function create2DArray(row, col){
var array2D = new Array(row);
for (var i = 0; i < row; i++) {
array2D[i] = new Array(col);
}
return array2D;
}
function check_year_event() {
var years_and_events = create2DArray(10, 3);
years_and_events[0][0] = 2001;
years_and_events[0][1] = "Karate Tournament";
years_and_events[0][2] = "Annual karate tournament held globally";
years_and_events[1][0] = 2002;
years_and_events[1][1] = "Beauty Pageant";
years_and_events[1][2] = "Beauty pageant held globally";
years_and_events[2][0] = 2003;
years_and_events[2][1] = "Film Festival";
years_and_events[2][2] = "Film festival held globally";
years_and_events[3][0] = 2004;
years_and_events[3][1] = "Singing Contest";
years_and_events[3][2] = "Singing contest tournament held globally";
years_and_events[4][0] = 2005;
years_and_events[4][1] = "Wedding";
years_and_events[4][2] = "Wedding tournament held globally";
years_and_events[5][0] = 2007;
years_and_events[5][1] = "Karate Tournament";
years_and_events[5][2] = "Annual karate tournament held globally";
years_and_events[6][0] = 2008;
years_and_events[6][1] = "Beaty Pageant";
years_and_events[6][2] = "Beauty pageant held globally";
years_and_events[7][0] = 2009;
years_and_events[7][1] = "Film Festival";
years_and_events[7][2] = "Film festival held globally";
years_and_events[8][0] = 2010;
years_and_events[8][1] = "Singing Contest";
years_and_events[8][2] = "Singing contest tournament held globally";
years_and_events[9][0] = 2011;
years_and_events[9][1] = "Wedding";
years_and_events[9][2] = "Wedding tournament held globally";
var year = document.getElementById('year_list').value;
var event = document.getElementById('event_list').value;
var found = false;
for (var i = 0; i < years_and_events.length; i++) {
if ((year == years_and_events[i][0]) && (event == years_and_events[i][1])) {
document.getElementById('show_description').innerHTML = years_and_events[i][2];
document.getElementById('send_notice').style.visibility = "hidden";
document.getElementById('show_description').style.visibility = "visible";
found = true;
break;
}
}
if (found == false) {
document.getElementById('show_description').style.visibility = "hidden";
document.getElementById('send_notice').style.visibility = "visible";
}
}
最佳答案
使用 display: none 来隐藏您的对象。 Visibility:hidden 仍然占据元素的空间。
关于php - 如何重叠 document.getElementById ('' ).style.visibility = "hidden"中的 html 元素；，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6012804/