Question

我在我的应用程序中使用geomap-linechart api ..我想在下拉选择的索引更改事件中查看地图和图表..如果我把它放在更新面板中它不起作用..它变为空白..但如果我把控件放在更新面板之外，它会很好。这个问题是否有任何原因或建议？是不是可以在更新面板里面使用geomap ??

这是我的代码..

<script src="Scripts/jquery-1.3.2.min.js" type="text/javascript"></script>
<script type='text/javascript' src='http://www.google.com/jsapi'></script>
<script src='http://maps.google.com/maps?file=api&v=2&key=ABCDEFG' type='text/javascript'></script>
<script type='text/javascript'>

google.load('visualization', '1', { 'packages': ['geomap'], 'language': 'fr'});        

    var countryCode;

// map function

    function DrawWorldMap(country, lat, lang, name, count, usercount, user, bandwidth, vtitle, htitle, title1, title2) {
        try {
            var data = new google.visualization.DataTable();
            data.addRows(count);
            data.addColumn('string', 'Country');
            data.addColumn('number', 'BandWidth');
            var contry = country.split(',');
            var band = bandwidth.split(',');

            for (var i = 0; i < count; i++) {
                data.setValue(i, 0, contry[i]);
            }
            for (var h = 0; h < count; h++) {
                data.setValue(h, 1, Number(band[h]));
            }
            var options = {};
            options['dataMode'] = 'regions';

            var container = document.getElementById('<%=map_canvas.ClientID%>');
            var geomap = new google.visualization.GeoMap(container);
            geomap.draw(data, options);
            var lati = lat;
            var langi = lang;
            var loop = count;
            google.visualization.events.addListener(
    geomap, 'regionClick', function (e) {
        countryCode = e['region'];
        CreateCountryMap(lati, langi, name, loop, usercount, country, user, bandwidth, vtitle, htitle, title1, title2);

    });

        }            
        catch (exception) {
            alert('drawworldmap: ' + exception);
        } 
        drawVisualization(user, bandwidth, usercount, vtitle, htitle, title1, title2); // here am calling the chart function..
    }

//图表功能

   function drawVisualization(User, Bandwidth, counts, vtitle, htitle, title1, title2) {
        try {
            // Create and populate the data table.
            var data = new google.visualization.DataTable();
            data.addColumn('string', title1);
            data.addColumn('number', title2);
            var username = User.split(',');
            var BandWidth = Bandwidth.split(',');
            for (var i = 0; i < counts; i++) {
                data.addRow([String(username[i]), Number(BandWidth[i])]);
            }

            // Create and draw the visualization.
            new google.visualization.LineChart(document.getElementById('<%=visualization.ClientID%>')).
        draw(data, { curveType: "function", pointSize: 5, title: 'User Chart', titlePosition: 'out',
            width: 400, height: 350, backgroundColor: 'AliceBlue',
            vAxis: { maxValue: 100, title: vtitle }, fontSize: 8, hAxis: { title: htitle }
        }
            );
        }
        catch (exception) {
            alert(exception);
        }
    }       

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>

<asp:DropDownList ID="ddlusername" runat="server" AutoPostBack="true" 
        OnSelectedIndexChanged="ddlusername_SelectedIndexChanged" Height="17px" 
        Width="132px">   </asp:DropDownList>    

<div id="visualization" align="center" style="border: thin solid grey;" runat="server"> </div>

<div id='map_canvas' style="border: thin solid grey;" align="center" runat="server"> </div>

<asp:Label ID="lblmap" runat="server"></asp:Label>

</ContentTemplate>
</asp:UpdatePanel>

我正在从这背后的代码调用drawworldmap函数..

   ScriptManager.RegisterStartupScript(lblmap, this.GetType(), "js2", "google.setOnLoadCallback(DrawWorldMap('" + contry + "','" + city + "','" + langitude + "','" + longitude + "'," + count + "," + usercount + ",'" + username + "','" + bandwidth + "','Bandwidth','UserName','User','BandWidth'));", true);

如果您有任何想法，请帮忙..

谢谢..

Answer 1

第一个解决方案是再次加载google map的调用函数，就像javascript中的initMap（）函数一样。第二个解决方案是从地图制作iframe页面，并在点击地图div时加载它。

您的问题是在更新面板中，它未正确加载。

所以。当你再次点击地图的div时，首先通过第一个解决方案加载地图。其他方面通过加载iframe来使用第二个解决方案。

我在我的项目中完成了这两件事。

希望这会对你有所帮助。

Answer 2

<script type="text/javascript">
      function ActiveTabChanged(sender, e) {
        if (sender.get_activeTab().get_headerText().toLowerCase().indexOf('contact') > -1) {
            var FrameSrc = ('<%=SetFrameSrc() %>');
            document.getElementById('<%=ifrmMap.ClientID %>').src = FrameSrc;
        }   
    }
</script>

<iframe id="ifrmMap" runat="server" height="324px" width="462px" frameborder="0" scrolling="no" marginwidth="0" marginheight="0"></iframe>

在Code Behind

/// <summary>
        /// Get the iframe source when contact tab active.
        /// </summary>
        /// <returns></returns>
        public string SetFrameSrc()
        {
            string strSrc = string.Empty;
            if (!string.IsNullOrEmpty(queryID))
            {
                strSrc = //Add Google Map New page url;
            }
            return strSrc;
        }

当您从下拉列表中选择地图时，请在选定的indexchanged上调用此javascript函数。把iframe放在你现在放置地图div的地方。并将地图功能放到新页面上。这个iframe加载了。最后一个函数是函数后面的函数，你必须在那里设置你的新页面写地图代码。

GeoMap在更新面板中无法正常工作

2 个答案:

在Code Behind