如何从文本框中删除文本 [英] How to remove the text from textbox

问题描述

大家好，



我已经为文本框分配了一个默认的文本字符串。现在我想如果有人点击该文本框，文本框中的值将被删除。



i我使用下面的代码，但它不起作用并给我一个错误。

  public   void  TextBox_GotFocus（ object  sender，RoutedEventArgs e）
 {
 TextBox tb =（TextBox）sender; 
 tb.Text =  string  .Empty; 
 tb.GotFocus  -  = TextBox_GotFocus; 
} 

任何人都可以帮我解决这个问题。

解决方案

使用ASP来自 WaterMark Textbox 的.NET WaterMark文本框[ ^ ]。它位于 Ajax Toolkit 。

也可以查看..

^ ]

http://oneaonej.blogspot.com/2012/10/ajax-control-toolkit-textboxwatermark.html [ ^ ]

http：//www.aspdotnet-suresh .com / 2011/10 / how-to-create-watermark-textbox-using.html [ ^ ]

请试试这个。



< input type =textplaceholder =mm / dd / yy onblur =if（this.value ==''）{this.placeholder ='mm / dd / yy'; this.style.color ='＃293f46';}autocomplete =offid =datepickerstyle =color： rgb（41,63,70）;/>





演示网址

演示网址

试试这个：

 <   asp：TextBox    < span class =code-attribute> ID   =  new_range1    onChange   =  newobjCompute（）      onFocus   =  this.value =''; return false;    runat   =  server    BorderWidth   =  0px   高度  =  47px  
                      < span class =code-attribute>            < span class =code-attribute>                      宽度  =  90px    style   =  text-align：center >  0 <   / asp：TextBox  >  
 

看到onFocus标签？首先为文本框设置一个值。如果单击文本框，它将删除默认值为null。

Hi All,

i have assigned a default string of text to a text box. now i want if someone click on that textbox, value inside the textbox gets removed.

i am using below code but its not working and giving me an error.

public void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
   TextBox tb = (TextBox)sender;
   tb.Text = string.Empty;
   tb.GotFocus -= TextBox_GotFocus;
}

can anyone please help me in resolving this issue.

解决方案

Use a ASP.NET WaterMark textBox from WaterMark Textbox[^]. It is in Ajax Toolkit.
Also can view..
How to used watermark in asp.net for Textbox[^]
http://oneaonej.blogspot.com/2012/10/ajax-control-toolkit-textboxwatermark.html[^]
http://www.aspdotnet-suresh.com/2011/10/how-to-create-watermark-textbox-using.html[^]

Please try this.

<input type="text" placeholder="mm/dd/yy" onblur="if(this.value==''){ this.placeholder='mm/dd/yy';this.style.color='#293f46';}" autocomplete="off" id="datepicker" style="color: rgb(41, 63, 70);"/>


Demo URL
Demo URL

try this one:

<asp:TextBox ID="new_range1" onChange="newobjCompute()"  onFocus="this.value=''; return false;" runat="server" BorderWidth="0px" Height="47px"
                           Width="90px" style="text-align: center">0</asp:TextBox>

see the "onFocus" tag? set a value for your textbox first. if you click the textbox, it will delete the default value to null.

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