<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="format-detection" content="telephone=no">
<title>三級關聯多選下拉框</title>
<script src="<?php echo base_url() ?>js/jquery-1.7.2.min.js"></script>
<link href="<?php echo base_url(); ?>css/buildfair/jquery-ui.css" rel="stylesheet" />
<script src="<?php echo base_url() ?>js/jquery-ui.min.js"></script>
<script src="<?php echo base_url() ?>js/jquery.multiselect.min.js"></script>
<script src="<?php echo base_url() ?>js/jquery.multiselect.zh-cn.js"></script>
<link href="<?php echo base_url(); ?>css/buildfair/jquery.multiselect.css" rel="stylesheet"/>
<script src="<?php echo base_url() ?>js/jquery.multiselect.filter.js"></script>
<link href="<?php echo base_url(); ?>css/buildfair/jquery.multiselect.filter.css" rel="stylesheet"/>
</head>
<body>
<div>
<p>多選下拉框：</p>
<select id="first_dist" multiple="multiple" data-level="1" style="display: none;">
<?php foreach ( $firstDist as $row ): ?>
<option value="<?php echo $row[ 'id' ]; ?>"><?php echo $row[ 'name' ]; ?></option>
<?php endforeach; ?>
</select>
<select id="second_dist" multiple="multiple" data-level="2" style="display: none;">
</select>
<select id="third_dist" multiple="multiple" data-level="3" style="display: none;">
</select>
<select id="fourth_dist" multiple="multiple" data-level="4" style="display: none;">
</select>
<br/>
</div>
<div>
<p>單選下拉框：</p>
<select id="first_dist_single" style="display: none;">
<?php foreach ( $firstDist as $row ): ?>
<option value="<?php echo $row[ 'id' ]; ?>"><?php echo $row[ 'name' ]; ?></option>
<?php endforeach; ?>
</select>
</div>
<div>
<p>單選下拉框（帶搜尋功能）：</p>
<select id="first_dist_single_filter" style="display: none;">
<?php foreach ( $firstDist as $row ): ?>
<option value="<?php echo $row[ 'id' ]; ?>"><?php echo $row[ 'name' ]; ?></option>
<?php endforeach; ?>
</select>
</div>
</body>
</html> <script>
(function() {
// 預設隻顯示選擇了的3個
var DEF_SHOW_SELELCTED_NUMBER = 3;
$("#first_dist_single").multiselect({
multiple: false,
header: "選擇一項",
selectedList: 1
});
$("#first_dist_single_filter").multiselect({
multiple: false,
noneSelectedText: "請選擇",
selectedList: 1
}).multiselectfilter();
$("#first_dist").multiselect({
selectedList: DEF_SHOW_SELELCTED_NUMBER,
noneSelectedText: '請選擇省市',
close: function(event, ui) {
showNextDist($(this));
}
}
);
var showNextDist = function(obj) {
var level = obj.data('level'),
nextLevel = parseInt(level) + 1,
nextDistNode = null, defaultText = '';
if (parseInt(nextLevel) === 2) {
nextDistNode = $('#second_dist');
defaultText = '請選擇市縣';
} else if (parseInt(nextLevel) === 3) {
nextDistNode = $('#third_dist');
defaultText = '請選擇地級市';
} else if (parseInt(nextLevel) === 4) {
nextDistNode = $('#fourth_dist');
defaultText = '請選擇區鎮';
}
var selectedArr = obj.multiselect("getChecked").map(function() {
return this.value;
}).get();
var selectedVal = selectedArr.join(',');
if (selectedVal !== '') {
var url = '<?php echo site_url(); ?>/m/buildfair/get_district';
$.post(url, {upid: selectedVal, level: nextLevel}, function(data) {
if (data.success) {
var srcData = data.data;
if (nextDistNode !== null && srcData.length > 0) {
nextDistNode.html('');
for (index in srcData) {
var opt = srcData[index]
nextDistNode.append('<option value="' + opt.id + '">' + opt.name + '</option>');
}
nextDistNode.multiselect({
selectedList: DEF_SHOW_SELELCTED_NUMBER,
noneSelectedText: defaultText,
close: function(event, ui) {
showNextDist(nextDistNode);
}
}).multiselect('refresh');
}
}
}, 'json');
} else {
if (nextDistNode !== null) {
nextDistNode.multiselect().multiselect("destroy").hide();
var nextDistLevel = nextDistNode.data('level');
if (parseInt(nextDistLevel) === 2) {
$('#third_dist').multiselect().multiselect("destroy").hide();
$('#fourth_dist').multiselect().multiselect("destroy").hide();
} else if (parseInt(nextDistLevel) === 3) {
$('#fourth_dist').multiselect().multiselect("destroy").hide();
}
}
}
}
})();
</script> 注：記得要引入相關的js和css檔案。如果不知道去哪找，這裡有個連結，在裡面可以找到：
![DOM下元素 offset client scroll 相關屬性簡介[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)