当搜索没有结果时抛出弹出窗口

发布于 2025-01-06 11:56:50 字数 614 浏览 0 评论 0原文

事情是这样的。拥有一个使用 ASP.NET WebForms 和 C# 后端运行的 Web 应用程序。这东西工作得很好，但作为这方面的初学者，我一直在寻求改进。现在，为了处理用户的搜索没有返回结果，我利用以下内容，并想知道是否有任何更干净的方法来做到这一点，以供将来参考：

DataClass data = new DataClass();
var searchresults = data.GetData(searchBox.Text);
int datanumber = searchresults.Count();
if (datanumber == 0)
{
    ClientScript.RegisterStartupScript(this.GetType(), "alert", "javascript:alert('There were no records found to match your search');", true);
}
else
{
    DropDownList1.Visible = true;
    DropDownList1.Items.Clear();
    DropDownList1.DataSource = searchresults;
    DropDownList1.DataBind();
}

原文

Here's the deal. Have a functioning web app using ASP.NET WebForms with a C# backend. The thing works fine, but I'm always looking to improve, as a beginner at this stuff. Right now, to deal with a user's search coming back with no results, I utilize the following, and was wondering if there was any cleaner way to do it, for future reference:

DataClass data = new DataClass();
var searchresults = data.GetData(searchBox.Text);
int datanumber = searchresults.Count();
if (datanumber == 0)
{
    ClientScript.RegisterStartupScript(this.GetType(), "alert", "javascript:alert('There were no records found to match your search');", true);
}
else
{
    DropDownList1.Visible = true;
    DropDownList1.Items.Clear();
    DropDownList1.DataSource = searchresults;
    DropDownList1.DataBind();
}

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七秒鱼° 2025-01-13 11:56:50

我同意不使用弹出窗口，因此您始终可以做一些简单的事情，例如在页面上放置一个 Label 对象：

<asp:Label runat="server" id="lblResultMsg" ForeColor="Red" Visible="False" />

然后动态设置文本（或将其作为属性添加到代码中）并将标签设置为在如果没有找到结果则回发：

if (datanumber == 0)
{
    lblResultMsg.Text = "There were no records found to match your search.";
    lblResultMsg.Visible = true;
}
else
{
    lblResultMsg.Text = "";
    lblResultMsg.Visible = false;

    // do your data binding
}

但是有很多方法可以实现这样的目标。关于您关于使用 Enumerable 集合中的 .Count 的问题 - 没有什么可以阻止您这样做，因为它是完全有效的。问题是您认为哪种方法更具可读性？

I agree with the not using popups, so you could always do something as simple as having a Label object on your page:

<asp:Label runat="server" id="lblResultMsg" ForeColor="Red" Visible="False" />

And then set the text dynamically (or add it as a property to the code) and set the label to be visible on postback if no results are found:

if (datanumber == 0)
{
    lblResultMsg.Text = "There were no records found to match your search.";
    lblResultMsg.Visible = true;
}
else
{
    lblResultMsg.Text = "";
    lblResultMsg.Visible = false;

    // do your data binding
}

But there are quite a vast number of ways you could achieve something like this. Regarding your question about using the .Count from the Enumerable collection - there's nothing stopping you doing this as it's perfectly valid. The question is which method do you find more readable?

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走过海棠暮 2025-01-13 11:56:50

如果您包含 jquery ui 对话框（http://jqueryui.com/demos/dialog/），您可以简单地调用它来创建一个漂亮的对话框：

$('<div>message</div>').dialog({autoOpen:true,title:'Error'});

if you include the jquery ui dialog (http://jqueryui.com/demos/dialog/), you can simply call this to create a nice dialog box:

$('<div>message</div>').dialog({autoOpen:true,title:'Error'});

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So尛奶瓶 2025-01-13 11:56:50

就我个人而言，我更喜欢创建一个辅助函数来将相关的 javascript 插入到页面中，并且只将参数传递给函数，这样我就不需要每次都担心混乱的细节。

类似于：

public static void GrowlMessage(System.Web.UI.Control pageControl, string header = "", string message = "", bool sticky = false, string position = "top-right", string theme = "", bool closer = true, int life = 8)
{
    string _js = "$.jGrowl('" + HttpContext.Current.Server.HtmlEncode(message) + "', { header:'" + header + "', sticky:" + sticky.ToString().ToLower() + ", position: '" + position + "', theme: '" + theme + "', closer: " + closer.ToString().ToLower() + ", life:" + life * 1000 + "});";
    ScriptManager.RegisterStartupScript(pageControl, pageControl.GetType(),"Growl",_js, true);            
}

我使用的示例还需要 jQuery 和可用的 jGrowl 库此处。恕我直言，这些消息很漂亮。它们不引人注目，用户不需要单击按钮即可使它们消失，并且它们会在您指定的时间后消失。

但我同意 Mike 的观点，如果您没有任何记录，则应该使用 GridView 的内置属性（EmptyDataRowStyle 和 EmptyDataRowText）来显示“没有与您的查询匹配的数据”样式消息。假设您正在使用 GridView，那就是..

Personally I prefer to create a helper function for inserting the relevant javascript into the page, and only pass parameters to the function so that I don't need to worry about the messy details every time.

Something like :

public static void GrowlMessage(System.Web.UI.Control pageControl, string header = "", string message = "", bool sticky = false, string position = "top-right", string theme = "", bool closer = true, int life = 8)
{
    string _js = "$.jGrowl('" + HttpContext.Current.Server.HtmlEncode(message) + "', { header:'" + header + "', sticky:" + sticky.ToString().ToLower() + ", position: '" + position + "', theme: '" + theme + "', closer: " + closer.ToString().ToLower() + ", life:" + life * 1000 + "});";
    ScriptManager.RegisterStartupScript(pageControl, pageControl.GetType(),"Growl",_js, true);            
}

The sample I have used also requires jQuery and the jGrowl library available here. And IMHO the messages are pretty. They are unobtrusive, the user does not need to click a button to make them go away, and they fade away after your specified amount of time.

But I agree with Mike, that if you don't have any records, you should just use the built in properties of a GridView (EmptyDataRowStyle and EmptyDataRowText) to display a 'no data matching your query' style message. Assuming that you're using a GridView at all, that is..

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不必了 2025-01-13 11:56:50

当谈到用户反馈时，Impromptu 是我的朋友。 Aaron Goldenthal 的网站上有一个很好的 Impromptu ASP.NET 实现：http://www.aarongoldenthal.com/post/2009/11/11/Using-jQuery-Impromptu-With-ASPNET.aspx

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