将C＃字符串变量转换成JavaScript警报在ASP.NET code背后

问题描述

我使用的GridView的一些文本框和一个下拉它框。当用户点击某行（文本框或DDL），我想弹出一个JavaScript警告告诉他们行号是什么。我可以得到一个事件，当用户点击文本框之一开火，但我不能告诉他们这是警报内部哪一行，因为我似乎无法弄清楚如何把一个C＃变量为一个Javascript警报。

I'm using a Gridview with some text boxes and a drop down box in it. When the user clicks on a row (text box or DDL), I want to pop up a Javascript alert that tells them what the row number is. I can get an event to fire when a user clicks on one of the text boxes, but I can't tell them which row it is inside the alert because I can't seem to figure out how to put a C# variable into a Javascript alert.

下面是我已经试过：

public void gv_instruments_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
       TextBox txtBox1 = (TextBox)e.Row.FindControl("txt_partNumbers");
       if (txtBox1 != null)
       {
           txtBox1.Attributes.Add("onclick", "javascript:alert('Message')"); //works

           Int32 selectedRow = e.Row.RowIndex;//get row index number
           string message = "You've selected row: " + selectedRow.ToString();
           message = "javascript:alert('" + message + "')";

           //txtBox1.Attributes.Add("onclick", message); //doesn't work 

           string title = "title";
           //ScriptManager.RegisterStartupScript(Page, Page.GetType(), 
                title, "alert('" + message + "');", true); //doesn't work

           //ScriptManager.RegisterClientScriptBlock(Page,Page.GetType(), 
                title, "alert('" + message + "');",true); //doesn't work
            }
        }
    }

我发现，使用的javascript：警报（'在互联网上的网页+消息+'）; 结构，但它不工作（或至少我无法得到它的工作）。我一直小心使用双引号和放大器;单引号和我可以看到在调试器看起来像一个有效的消息（如： JavaScript的：警报（'您已经选择行：0'），我还以为。撇号你可能会出现的问题，所以我删除和放大器;以你所取代它，但这并不工作的唯一的构造，我可以得到的工作是这样的：

I've found pages on the internet that use the "javascript:alert('" + message + "')"; construct, but it doesn't work (or at least I can't get it to work). I've been careful with the double quotes & single quotes and I can see what looks like a valid message in the debugger (EG: javascript:alert('You've selected row: 0'), I also thought the apostrophe in "you've" might have been the problem, so I removed that & replaced it with "you have", but that doesn't work either. The only construct that I can get to work is this:

txtBox1.Attributes.Add（onclick事件，JavaScript的：警报（'消息'））;

我是什么失踪？

推荐答案

如果你移动你的JavaScript来的前端，您的code会大量清洁。

If you move your javascript to front end, your code will be a lot cleaner.

下面是如果你点击一个文本框用于显示一个警告框的例子。

Here is an example which displays an alert box if you click on a textbox.

<script type="text/javascript">
    function showMessage(id) {
        alert('You have selected row: ' + id);
    }
</script>        
<asp:GridView runat="server" ID="gv_instruments" 
    OnRowDataBound="gv_instruments_RowDataBound"
    AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField HeaderText="Id" DataField="Id" />
        <asp:BoundField HeaderText="FirstName" DataField="FirstName" />
        <asp:BoundField HeaderText="LastName" DataField="LastName" />
        <asp:TemplateField HeaderText="Click Me">
            <ItemTemplate>
                <asp:TextBox runat="server" ID="txt_partNumbers">
                </asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

public class User
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        var collection = new List<User>()
            {
                new User {Id = 1, FirstName = "John", LastName = "Doe"},
                new User {Id = 2, FirstName = "Marry", LastName = "Doe"},
                new User {Id = 3, FirstName = "David", LastName = "Newton"},
            };

        gv_instruments.DataSource = collection;
        gv_instruments.DataBind();
    }
}

public void gv_instruments_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        var txtBox1 = (TextBox) e.Row.FindControl("txt_partNumbers");
        if (txtBox1 != null)
        {
            txtBox1.Attributes.Add("onclick", 
              string.Format("showMessage('{0}')", e.Row.RowIndex));
        }
    }
}

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