关于维护控件状态 [英] about mainting controls state

问题描述

我正在以这种方式获取输入图像，并使其在表单加载时不可见

I am taking input image in this way and making it invisible on form load

<input type="image"  id ="img" name="img" style="display:none;"  runat="server" src="../Images/calendar.jpg" "  />

在某些情况下，我通过javascript
使它可见/不可见 每当我单击服务器端按钮或每当表单获取回发使其可见后，它再次变得不可见

On certain condition i am making it visible/Invisible through javascript
After making it visible whenever i am clicking server side button or whenever form is getting postback it is getting invisible again

推荐答案

使用Hidden变量来保持可见/不可见标志.同样在回发时检查标志并在javascript
中执行display:none或display:block

Use Hidden variable to maintain visible / Insvisible flag. Also when ever postbacks check for flag and do display:none or display:block in the javascript

(document).ready(function () { var manager = Sys.WebForms.PageRequestManager.getInstance(); manager.add_endRequest(endRequest); manager.add_beginRequest(OnBeginRequest); if(hdnShowflag == true) { display:block } else { display:block } }); function OnBeginRequest(sender, args) { if(hdnShowflag == true) { display:block } else { display:block } } function endRequest(sender, args) { if(hdnShowflag == true) { display:block } else { display:block } }

(document).ready(function () { var manager = Sys.WebForms.PageRequestManager.getInstance(); manager.add_endRequest(endRequest); manager.add_beginRequest(OnBeginRequest); if(hdnShowflag == true) { display:block } else { display:block } }); function OnBeginRequest(sender, args) { if(hdnShowflag == true) { display:block } else { display:block } } function endRequest(sender, args) { if(hdnShowflag == true) { display:block } else { display:block } }

如果使用会话管理，请将变量的状态存储在会话中，并在页面重新加载后加载. 如果您不了解状态管理，则可能需要在书或msdn中对其进行阅读.

If you are using session management, store the state of the variable in a session and load it once the page reloads.
If you are unaware about state management, you might want to read about it in a book or msdn.

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