我试图创建一个显示从数据谷歌的图表中的SQL数据库的Asp.net应用程序生成的脚本中的JavaScript变量。现在,我只是试图将C#int变量的值传递给JavaScript变量。我会在稍后找出其余的。传递一个C#变量值在代码隐藏类
我已创建的C#变量: 公众诠释timcs = 40;
我尝试创建JavaScript变量并将其显示在警告框中: var timjs ='<%= timcs%>'; alert(timjs);
产生的警告框只是说:<%= timcs%>。
如果我变种timjs = <%= timcs%>; (没有引号)它根本不起作用。
我已经尝试了许多不同的方法,它从来没有工作。我究竟做错了什么?所有的代码如下。
谢谢。
using System;
using System.Web.UI;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
namespace TheBIGContest
{
public partial class _Default : System.Web.UI.Page
{
public int timsc = 40;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
// Bind Gridview
BindGvData();
// Bind Charts
BindChart();
}
}
private void BindGvData()
{
gvData.DataSource = GetChartData();
gvData.DataBind();
}
private void BindChart()
{
DataTable dsChartData = new DataTable();
StringBuilder strScript = new StringBuilder();
try
{
dsChartData = GetChartData();
strScript.Append(@"<script type='text/javascript'>
// Load the Visualization API and the corechart package.
google.charts.load('current', { 'packages': ['corechart'] });</script>
<script type='text/javascript'>
// Set a callback to run when the Google Visualization API is loaded.
google.charts.setOnLoadCallback(drawChart);
var timjs = '<%=timcs %>';
alert(timjs);
// Callback that creates and populates a data table,
// instantiates the pie chart, passes in the data and
// draws it.
function drawChart() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Person');
data.addColumn('number', 'Points');
data.addRows([ ['Tim', 10], ['Barb', 20], ['Lee Ann', 30] ]);");
//Set chart options
strScript.Append("var options = {'title':'Points to Date', chartArea: { left: 43, top: 50, width: '80 %', height: '80%' }, backgroundColor: 'fff', 'width': 610, 'height':450, 'vAxis': { minValue: 0, ticks: [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50]}, 'legend':'none'};");
// Instantiate and draw our chart, passing in some options.
strScript.Append("var chart = new google.visualization.ColumnChart(document.getElementById('chart_div')); chart.draw(data, options); }");
strScript.Append("</script>");
ltScripts.Text = strScript.ToString();
}
catch
{
}
finally
{
dsChartData.Dispose();
strScript.Clear();
}
}
/// <summary>
/// fetch data from mdf file saved in app_data
/// </summary>
/// <returns>DataTable</returns>
private DataTable GetChartData()
{
DataSet dsData = new DataSet();
try
{
SqlConnection sqlCon = new SqlConnection(ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString);
SqlDataAdapter sqlCmd = new SqlDataAdapter("GetData", sqlCon);
sqlCmd.SelectCommand.CommandType = CommandType.StoredProcedure;
sqlCon.Open();
sqlCmd.Fill(dsData);
sqlCon.Close();
}
catch
{
throw;
}
return dsData.Tables[0];
}
}
}
它,因为你使用的是文本字符串所以它不执行服务器端代码。我将在不带文字(@)的单独.Append方法中首先追加变量。你可以看看使用内插和文字字符串组合($ @),但你可能需要转义一些括号等。 – WraithNath
我试过“如何从ASP.NET变量给JavaScript变量数据?”它没有工作。还有其他的错误。 –
@WithithNath - 你能解释一些吗?我对此很感兴趣。谢谢! –