在AJAX控件工具包选项卡控件中，Google可视化功能很小

本文介绍了在AJAX控件工具包选项卡控件中，Google可视化功能很小的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图在asp.net AJAX工具包选项卡控件中使用谷歌可视化，列图，但是我的问题很小（字面意思）。

如果我将该图表添加到页面加载时默认显示的选项卡中，但条形图正确显示，但是，如果我将相同的控件添加到另一个选项卡并且重新加载页面，当我点击另一个标签时，显示控件，但它的微小且不可用。

下面是一些代码test.aspx页面，说明问题：

 <％@ Page Language =vbAutoEventWireup =falseCodeBehind = Default.aspx.vbInherits =TestProject._Default％> 
 
 <！DOCTYPE html PUBLIC -  // W3C // DTD XHTML 1.0 Transitional // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"> 
< html xmlns =http://www.w3.org/1999/xhtml> 
< head id =Head1runat =server> 
< title>< / title> 
 
< script type =text / javascriptsrc =http://www.google.com/jsapi>< / script> 
 
< script type =text / javascript> 
 google.load（'visualization'，'1'，{packages：['columnchart']}）; 
< / script> 
 
< script type =text / javascript> 
函数drawVisualization（）{
 //创建并填充数据表。 
 var data = new google.visualization.DataTable（）; 
 data.addColumn（'string'，'Name'）; 
 data.addColumn（'number'，'Height'）; 
 data.addRows（3）; 
 data.setCell（0，0，'Tong Ning mu'）; 
 data.setCell（1，0，'Huang Ang fa'）; 
 data.setCell（2，0，'teng nu'）; 
 data.setCell（0，1，174）; 
 data.setCell（1，1，523）; 
 data.setCell（2，1，86）; 
 
 //创建并绘制可视化图。 
 new google.visualization.ColumnChart（document.getElementById（'visualization1'））。 
 draw（data，null）; 
 new google.visualization.ColumnChart（document.getElementById（'visualization2'））。 
 draw（data，null）; 
} 
 google.setOnLoadCallback（drawVisualization）; 
< / script> 
 
< / head> 
< body> 
< form id =form1runat =server> 
< asp：ScriptManager ID =ScriptManager1runat =server> 
< / asp：ScriptManager> 
< div> 
< cc1：TabContainer ID =TabContainer1runat =server> 
 < ContentTemplate> 
< div id =visualization1style =width：300px; height：300px;> 
< / div> 
< / ContentTemplate> 
< / cc1：TabPanel> 
< cc1：TabPanel runat =serverHeaderText =TabPanel1ID =TabPanel2> 
< ContentTemplate> 
< div id =visualization2style =width：300px; height：300px;> 
< / div> 
< / ContentTemplate> 
< / cc1：TabPanel> 
< / cc1：TabContainer> 
< / div> 
< / form> 
< / body> 
< / html>

解决方案

好的，我没有收到任何回复这篇文章所以这里是我如何解决这个问题，希望它可以帮助别人。

我从来没有真正得到这个问题的根源，但我发现如果我推迟了加载Visualisations直到包含它的标签被点击，然后问题消失。

在TabControl中，我调用一个JavaScript函数在点击时加载标签可视化：

 < cc1：TabContainer ID =TabContainer1runat =serverOnClientActiveTabChanged =tabChanged> 
 < ContentTemplate> 
< div id =visualization1style =width：300px; height：300px;>< / div> 
< / ContentTemplate> 
< / cc1：TabPanel> 
< cc1：TabPanel runat =serverHeaderText =TabPanel1ID =TabPanel2> 
< ContentTemplate> 
< div id =visualization2style =width：300px; height：300px;>< / div> 
< / ContentTemplate> 
< / cc1：TabPanel> 
< / cc1：TabContainer>

JavaScript函数

 函数tabChanged（sender，args）{
 var ActiveTab = sender.get_activeTabIndex（）; 
 if（sender.get_activeTabIndex（）== 0）{
 if（tab0Loaded！= true）{
 //载入可视化
 new google.visualization.ColumnChart（document。 getElementById（'visualization2'））。draw（data，null）; 
 tab0Loaded = true 
} 
} 
 if（sender.get_activeTabIndex（）== 1）{
 if（tab1Loaded！= true）{
 / /加载可视化
 new google.visualization.ColumnChart（document.getElementById（'visualization2'））。draw（data，null）; 
 tab1Loaded = true 
} 
} 
 
}

在回发过程中，活动标签可能会发生变化，以应对此问题我有一个JavaScript函数，当页面加载时执行，如果当前活动标签是包含可视化文件的标签，那么我加载它。

I'm trying to use a google visualisation, the column chart, inside an asp.net AJAX Toolkit Tab Control, but I'm having small (literally) problems.

If I add the visualisation to the tab that's displayed by default when the page loads, the bar chart displays correctly, however, if I add the same control to another tab and reload the page, when I click on the other tab, the control is displayed, but its tiny and unusable.

Here's some code for a test.aspx page that illustrates the problem:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="TestProject._Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>

    <script type="text/javascript" src="http://www.google.com/jsapi"></script>

    <script type="text/javascript">
        google.load('visualization', '1', { packages: ['columnchart'] });
    </script>

    <script type="text/javascript">
        function drawVisualization() {
            // Create and populate the data table.
            var data = new google.visualization.DataTable();
            data.addColumn('string', 'Name');
            data.addColumn('number', 'Height');
            data.addRows(3);
            data.setCell(0, 0, 'Tong Ning mu');
            data.setCell(1, 0, 'Huang Ang fa');
            data.setCell(2, 0, 'Teng nu');
            data.setCell(0, 1, 174);
            data.setCell(1, 1, 523);
            data.setCell(2, 1, 86);

            // Create and draw the visualizations.
            new google.visualization.ColumnChart(document.getElementById('visualization1')).
            draw(data, null);
            new google.visualization.ColumnChart(document.getElementById('visualization2')).
            draw(data, null);
        }
        google.setOnLoadCallback(drawVisualization);
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
        <cc1:TabContainer ID="TabContainer1" runat="server">
            <cc1:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel1">
                <ContentTemplate>
                    <div id="visualization1" style="width: 300px; height: 300px;">
                    </div>
                </ContentTemplate>
            </cc1:TabPanel>
            <cc1:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel2">
                <ContentTemplate>
                    <div id="visualization2" style="width: 300px; height: 300px;">
                    </div>
                </ContentTemplate>
            </cc1:TabPanel>
        </cc1:TabContainer>
    </div>
    </form>
</body>
</html>

解决方案

Ok, I didn't get a single response to this post so here is how I worked around the problem, hope it helps someone.

I never actually got the the root of this problem but I found that if I delayed the loading of the Visualisations till the tab that contains it is clicked then the problem goes away.

In the TabControl I call a JavaScript function to load the tabs visualisation when clicked:

<cc1:TabContainer ID="TabContainer1" runat="server" OnClientActiveTabChanged="tabChanged">
  <cc1:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel1">
    <ContentTemplate>
      <div id="visualization1" style="width: 300px; height: 300px;"></div>
    </ContentTemplate>
  </cc1:TabPanel>
    <cc1:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel2">
      <ContentTemplate>
        <div id="visualization2" style="width: 300px; height: 300px;"></div>
      </ContentTemplate>
  </cc1:TabPanel>
</cc1:TabContainer>

The JavaScript function

function tabChanged(sender, args) {
        var ActiveTab = sender.get_activeTabIndex();
        if (sender.get_activeTabIndex() == 0) {
            if (tab0Loaded != true) {
                //load the visualisation
                new google.visualization.ColumnChart(document.getElementById('visualization2')).draw(data, null);
                tab0Loaded = true
            }
        }
        if (sender.get_activeTabIndex() == 1) {
            if (tab1Loaded != true) {
                //load the visualisation
                new google.visualization.ColumnChart(document.getElementById('visualization2')).draw(data, null);
                tab1Loaded = true
            }
        }

 }

During postback the active tab could change, to cope with this I have a JavaScript function that executes when the page loads, if the current active tab is one containing a visualisation then I load it.

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