[英]Update panel doesn't work in asp.net
我正在尝试在页面上显示在线火车,而无需进行任何刷新。 所以我认为我必须使用updatepanel
。 我的面板应该每秒更新一次。
让我们解释一下我的代码。
我将这部分代码放在页面中:
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" OnLoad="UpdatePanel1_Load">
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
因此,我放置了一个时间间隔函数来刷新我的面板,
<script type="text/javascript">
$(function () {
setInterval("__doPostBack('<%=UpdatePanel1.ClientID%>', '');", 1000);
});
在我后面的代码中,我放置了所有获取的数据,
protected void UpdatePanel1_Load(object sender, EventArgs e)
{
foreach (var t in OnlineTrainList)
{
Response.Write("<div id='train-box' style='margin-left:" + (t.XTrainLocation - 8) + "px;margin-top:" + t.YTrainLocation + "px;background:" + t.Train.TrainColor + "'>" +
"<span>" +
t.TrainId +
"</span>" +
"</div>");
List<Sensor> PassedSensor = new List<Sensor>();
PassedSensor = SensorRepository.FindBy(i => i.CurrentTrainId == t.TrainId).ToList();
string color = TrainRepository.FindBy(i => i.Id == t.TrainId).First().TrainColor;
foreach (Sensor sensor in PassedSensor)
{
Response.Write("<div class='CurrentColor-Sensor' style='margin-left:" + (sensor.XLocation - 1) + "px;margin-top:" + (sensor.YLocation + 8) + "px;background:" + color + "'></div>");
}
}
}
所以我的问题是面板不刷新。面板UpdatePanel1_Load
只调用一次。
所以你的代码是:
foreach (var t in OnlineTrainList)
{
Response.Write("<div id='train-box' style='margin-left:" + (t.XTrainLocation - 8) + "px;margin-top:" + t.YTrainLocation + "px;background:" + t.Train.TrainColor + "'>" +
"<span>" +
t.TrainId +
"</span>" +
"</div>");
List<Sensor> PassedSensor = new List<Sensor>();
PassedSensor = SensorRepository.FindBy(i => i.CurrentTrainId == t.TrainId).ToList();
string color = TrainRepository.FindBy(i => i.Id == t.TrainId).First().TrainColor;
foreach (Sensor sensor in PassedSensor)
{
Response.Write("<div class='CurrentColor-Sensor' style='margin-left:" + (sensor.XLocation - 1) + "px;margin-top:" + (sensor.YLocation + 8) + "px;background:" + color + "'></div>");
}
}
首先,我必须引起您注意分配给所有这些div的id
,它必须是唯一的且永不相同。 您可以使用一个增量变量并将其附加到您的div的ID上,例如: div0, div1... etc
现在让我们看看循环中的第一行。 它基本上具有的是<span>
嵌套在<div>
并包含一些带有文本的属性。
Asp.Net处理元素的方式将是面向对象的,而不仅仅是html字符串:
protected void UpdatePanel1_Load(object sender, EventArgs e)
{
//clear the update panel
UpdatePanel1.ContentTemplateContainer.Controls.Clear();
//var to generate unique div id's
int divIDIncrement = 0;
foreach (var t in OnlineTrainList)
{
//increment the id generator
divIDIncrement++;
// create a a DIV element
HtmlGenericControl _tempDIV = new HtmlGenericControl("div");
//set the attributes for the div
_tempDIV.ID = "train-box" + divIDIncrement.ToString();
_tempDIV.Style["margin-left"] = (t.XTrainLocation - 8).ToString() + "px";
_tempDIV.Style["margin-top"] = t.YTrainLocation.ToString() + "px";
_tempDIV.Style["background"] = t.Train.TrainColor.ToString();
//create the inner span
HtmlGenericControl _tempSPAN = new HtmlGenericControl("span");
//set the span's innerText
_tempSPAN.InnerText = t.TrainId.ToString();
//add the span into the Div
_tempDIV.Controls.Add(_tempSPAN);
//add the Div into your UpdatePanel
UpdatePanel1.ContentTemplateContainer.Controls.Add(_tempDIV);
List<Sensor> PassedSensor = new List<Sensor>();
PassedSensor = SensorRepository.FindBy(i => i.CurrentTrainId == t.TrainId).ToList();
string color = TrainRepository.FindBy(i => i.Id == t.TrainId).First().TrainColor;
foreach (Sensor sensor in PassedSensor)
{
// create another div for the sub stuff
HtmlGenericControl _tempSubDIV = new HtmlGenericControl("div");
_tempSubDIV.Attributes["class"] = "CurrentColor-Sensor";
_tempSubDIV.Style["margin-left"] = (sensor.XLocation - 1).ToString() + "px";
_tempSubDIV.Style["margin-top"] = (sensor.YLocation + 8).ToString() + "px";
_tempSubDIV.Style["background"] = color.ToString();
//add the sub stuff to the update panel
UpdatePanel1.ContentTemplateContainer.Controls.Add(_tempSubDIV);
}
}
}
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