我在here问过类似但不一样的东西(已经回答了)。现在我有一些跟进问题,我认为最好再问一下(我已经阅读了规则,我希望我不会破坏任何规则。但如果我愿意,请提醒我)。
我从MySQL表中加载了几个城市的id,名称和位置,然后将其填充到HTML表格中。还有一个谷歌地图,标记指向这些城市。
当用户点击其中一个HTML行(tr标签)时,我希望在城市标记上弹出一个信息窗口。我在没有任何jQuery的情况下使用PHP,Javascript和XML。我已经做到了这一点。
现在我正在尝试使HTML表格可以排序。因此,当用户点击th时,数据将根据被点击的数据进行排序(但是,对于此示例,它只能按ID排序)。
问题是在它至少排序一次后,单击tr时信息窗口不再弹出。
我的HTML:
<?php
$query = "SELECT id, name, lat, lng FROM city ORDER BY id";
$arrCities = mysql_query ($query);
?>
<div id="gmap" style="width: 550px; height: 450px"></div>
<table id="tblData">
<tr>
<th>/* when the th clicked it'll call js function */
<a href="javascript:GetData('sort.php?by=id&val=<? echo $val; ?>', 'tblData');">ID</a>
</th>
<th>City</th>
</tr>
<?php while ($row = mysql_fetch_assoc($arrCities)) { ?>
<tr id="<?php echo $row['id']; ?>">
<td><?php echo $row['id']; ?></td>
<td><?php echo $row['name']; ?></td>
</tr>
<?php } ?>
</table>
我的PHP用于创建填充标记的XML(my-xml-generator.php):
<?php
$query = "SELECT id, name, lat, lng FROM city ORDER BY id";
$arrCities = mysql_query ($query);
$dom = new DOMDocument('1.0', 'utf-8');
$node = $dom->createElement ('markers');
$parNode = $dom->appendChild ($node);
header('Content-type: text/xml');
while ($row = mysql_fetch_assoc($arrCities))
{
$node = $dom->createElement ('marker');
$newNode = $parNode->appendChild ($node);
$newNode->setAttribute ('id', $row['id']);
$newNode->setAttribute ('name', $row['name']);
$newNode->setAttribute ('lat', $row['lat']);
$newNode->setAttribute ('lng', $row['lng']);
}
echo $dom->saveXML();
?>
我的Google Maps Javascript:
var gmap = new google.maps.Map (mapDiv, options);
var arrMarkers = [];
var infoWindow = new google.maps.InfoWindow;
// add markers to the map
DownloadUrl ("my-xml-generator.php", function(data)
{
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName ("marker");
for (var i = 0; i < markers.length; i++)
{
var id = markers[i].getAttribute("id");
var lat = parseFloat (markers[i].getAttribute("lat"));
var lng = parseFloat (markers[i].getAttribute("lng"));
var pos = new google.maps.LatLng (lat, lng);
var markerOptions =
{
position : pos,
map : gmap,
draggable : false
};
// add the marker
var marker = new google.maps.Marker (markerOptions);
arrMarkers.push(marker);
// assign onclick event for each tr
// this is the part that I have to somehow re-run after the sorting is done
var tr = document.getElementById(id);
google.maps.event.addDomListener (tr, "click",
(function(i) {
var row = i;
return function() {
RowClick (row);
}
})(i)
);
// add info window
var html = '<div>' + id + '</div>';
BindInfoWindow (marker, gmap, infoWindow, html);
}
});
function BindInfoWindow (marker, map, infoWindow, html)
{
google.maps.event.addListener (marker, "click", function()
{
infoWindow.setContent (html);
infoWindow.open (map, marker);
});
}
function RowClick (i)
{
google.maps.event.trigger (arrMarkers[i], "click");
}
function DownloadUrl (url, callback)
{
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function()
{
if (xhr.readyState == 4)
{
xhr.onreadystatechange = DoNothing;
callback(xhr, xhr.status);
}
};
xhr.open ('GET', url, true);
xhr.send (null);
}
function DoNothing() {}
我的GetData()函数(简单和常用):
function GetData (dataSource, divID)
{
var xhr = new XMLHttpRequest();
xhr.open ("GET", dataSource);
xhr.onreadystatechange = function()
{
if (xhr.readyState === 4)
{
var targetDiv = document.getElementById (divID);
targetDiv.innerHTML = xhr.responseText;
}
}
xhr.send (null);
}
我的sort.php(我的排序方式是再次运行查询以检索所需的排序结果并将tr行输出到表的innerHTML):
<?php
$by = $_GET['by'];
$val = $_GET['val'];
$query = "SELECT id, name, lat, lng FROM city ORDER BY $by $val";
$arrCities = mysql_query ($query);
// set the new order value
$val == 'ASC' ? 'DESC' : 'ASC';
?>
<tr>
<th>
<a href="javascript:GetData('sort.php?by=id&val=<? echo $val; ?>', 'tblData');">ID</a>
</th>
<th>City</th>
</tr>
<?php while ($row = mysql_fetch_assoc($arrCities)) { ?>
<tr id="<?php echo $row['id']; ?>">
<td><?php echo $row['id']; ?></td>
<td><?php echo $row['name']; ?></td>
</tr>
<?php } ?>
</table>
单击tr时,该tr中包含的城市的信息窗口将正确弹出。排序也有效
但是在它被排序一次之后,tr的点击事件显然已经消失了。如何在分类后重新分配它?
答案 0 :(得分:1)
DownloadUrl
回调和GetData
函数中调用封装的JS。将arrMarkers设为对象:var arrMarkers = {};
function BindMarkerRows() {
for(var id in arrMarkers) {
var tr = document.getElementById(id);
google.maps.event.addDomListener (tr, "click",
(function(marker) {
return function() {
google.maps.event.trigger (marker, "click");
}
})(arrMarkers[id])
);
}
}
DownloadUrl ("my-xml-generator.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName ("marker");
for (var i = 0; i < markers.length; i++) {
var id = markers[i].getAttribute("id");
var lat = parseFloat (markers[i].getAttribute("lat"));
var lng = parseFloat (markers[i].getAttribute("lng"));
var pos = new google.maps.LatLng (lat, lng);
var markerOptions =
{
position : pos,
map : gmap,
draggable : false
};
// add the marker
var marker = new google.maps.Marker (markerOptions);
arrMarkers[id] = marker; //Here we access the object as an associative array
}
BindMarkerRows();
}
function GetData (dataSource, divID)
{
var xhr = new XMLHttpRequest();
xhr.open ("GET", dataSource);
xhr.onreadystatechange = function()
{
if (xhr.readyState === 4)
{
var status = xhr.status;
if ((status >= 200 && status < 300) || status === 304)
{
var targetDiv = document.getElementById (divID);
targetDiv.innerHTML = xhr.responseText;
BindMarkerRows();
}
}
}
xhr.send (null);
}