如果已更改其他文本框值，如何清除文本框 [英] How to clear a text box if the other textbox value has been changed

问题描述

你好



说我3个文本框，名为val1，val2和res。我在res中显示val1和val2中值的加法结果。因此，如果用户更改这些值（i-e val1和val2中存在的值），则应清除res。示例用户在val1中输入2，在val2中输入3，因此添加结果为5，显示在红色文本框中现在说现在用户决定更改val1中的值，因此当他开始更改时，我希望我的res文本框被清除。



初学者请原谅我的平均问题



非常感谢

解决方案

您是否尝试过实现 TextChanged [ ^ ]事件在 val1 和 val2 文本框？如果您只需要在用户向其他两个文本框输入内容时清除 res ，只需在此处理程序中写入：

 res.Text =  string  .Empty; 

< blockquote>这是一个选项，在客户端使用javascript的onkeyup事件来清除结果。当用户选择val1控件并按下并释放键时，结果值将设置为空字符串。

  <   script     type   =  text / javascript >  
  //  结果清晰 
 函数 ResetResultValue（）{
  var  el =  document  .getElementById（' <％= res.ClientID％>'）; 
 el.value = ' '; 
} 
 <   /  脚本 >  
 
 <   asp：textbox     id   =  val1    runat   =  server    onkeyup   =  javascript：ResetResultValue（）; >  <   / asp：textbox  >  
 <   asp：textbox     id   =   val2    runat   = 服务器 >  <   / asp：textbox  >  
 <   asp：textbox    < span class =code-attribute> id   =  res    runat   = 服务器 >  <   / asp：textbox  >  
 <   asp：按钮    id   =  btnSubmit    runat   =  server    text   = 提交    onclick   =  btnSubmit_Click    /  > < /跨度> 

Hello

Say i 3 textboxes, the are named val1 , val2 and res. I show the addition result of values in val1 and val2 in res. So, if a user alters these values(i-e the values present in val1 and val2) res should be cleared. Example user enterd 2 in val1 and 3 in val2 so the addition result is 5 which is being shown in red textbox now say now user decides to change the value in val1 so when he begins to change i want my res text box to be cleared.

Beginner so please pardon my average questions

Thanks anyways

解决方案

Have you tried implementing a handler of TextChanged[^] event on val1 and val2 textboxes? If you simply need res to be cleared when user inputs something into any of two other textboxes, just write in this handler:

res.Text = string.Empty;

Here's one option, use javascript's onkeyup event on the client side to clear the result. When the user selects the val1 control and presses and releases a key the result value will be set to an empty string.

<script type="text/javascript">
    // clear result
    function ResetResultValue() {
        var el = document.getElementById('<%= res.ClientID %>');
        el.value = '';
    }
</script>
    
<asp:textbox id="val1" runat="server" onkeyup="javascript:ResetResultValue();"></asp:textbox>
<asp:textbox id="val2" runat="server"></asp:textbox>
<asp:textbox id="res" runat="server"></asp:textbox>
<asp:button id="btnSubmit" runat="server" text="Submit" onclick="btnSubmit_Click" />

这篇关于如果已更改其他文本框值，如何清除文本框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！