必填字段验证问题验证文本框的值 [英] Required Field Validator issue validating TextBox value

问题描述

我有一个文本框，我用它来存储一个URL来施加＆LT; ASP：超链接＆GT; 控制。我想要做的就是关火时， TextBox.Text 值为空，并在用户点击的RequiredFieldValidator >保存的。据我所知，我的逻辑是确定的，但验证器发射了？

I have a TextBox which i use to store a url to applied a <asp:HyperLink> control. What i want to do is fire off the RequiredFieldValidator when the TextBox.Text value is empty and the user clicks save. As far as i can tell, my logic is OK, but the validator isn't firing off?

下面的标记：

<div class="frmRow">
        <div class="frmControls">  
            <asp:Label ID="lblLink" AssociatedControlID="txtImgUrl" runat="server" Text="Image URL"></asp:Label>
            <asp:RequiredFieldValidator ID="imgUrlValidator" runat="server" ControlToValidate="txtImgUrl" ErrorMessage="Enter a Valid URL"  />
            <asp:TextBox ID="txtImgUrl" runat="server" />  
        </div>
        <div class="clearBoth"></div>
    </div>

下面是code，检查一个有效的绝对URL这是我的 btnSave 事件中：

Here is the code to check a valid absolute URL which is inside my btnSave event:

Uri url;
if (!string.IsNullOrEmpty(txtImgUrl.Text))
{
    txtImgUrl.Text = Uri.TryCreate(txtImgUrl.Text, UriKind.Absolute, out url) ? url.AbsoluteUri : string.Empty;
}

Save按钮标记：

Save button markup:

<br class="clearBoth" />
<asp:Button ID="btnSave" Text="Save Case study" ImageUrl="~/Assets/Design/buttons/btn-update.gif" CssClass="btn fltr" runat="server" OnClick="btnSave_OnClick" />
<div class="clearBoth"></div>

应该不是的RequiredFieldValidator 在 TryCreate 失败的一个狡猾的URL并发射了 txtImgUrl.Text =？

Shouldn't the RequiredFieldValidator be fired off when TryCreate fails on a dodgy URL and txtImgUrl.Text = ""?

有什么明显地告诉我在这里丢失？

Is there something blatantly obvious that I'm missing here?

任何帮助很多AP preciated

Any help is much appreciated

推荐答案

您应该检查按钮点击

 if (Page.IsValid) 
         {
            lblOutput.Text = "Required field is filled!";
         }
         else 
         {
            lblOutput.Text = "Required field is empty!";
         }

在ASPX中的按钮添加

In ASPX in the button add

CausesValidation="true"

这篇关于必填字段验证问题验证文本框的值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！