When the "back" button is clicked, the value of the text box in the previous page is not saved (empty the textbox in previous page when "back" button is clicked

There is a textbox on the page for the user to enter data. When the user clicks the hyperlink on the page, it will enter another page. At this time, click the browser "back" button to return to the original page, the text entered in textbox is displayed. However, sometimes the data is confidential and cannot be displayed in this case, so the problem arises ..

 

There are many ways to try on the Internet, such as setting Meta, closing viewstate, and so on. I have tried it and it is useless. The best way is to use JavaScript to clear it during page onbeforeunload.

 

Code (work in ff2.0, ie7.0 ):

 

<HtmlXmlns= "Http://www.w3.org/1999/xhtml">
<HeadRunat= "Server">
<Title>Untitled page</Title>
<ScriptType= "Text/JavaScript">
Function Clear ()
{
VaRTB=Document. getelementbyid ("Textbox1" );
TB. Value='' ;
}
</Script>
</Head>
<BodyOnbeforeunload= "Clear ();">
<FormID= "Form1"Runat= "Server" >
<Div>
<ASP: buttonID= "Button1"Runat= "Server"Text= "Button" />
</Div>
<ASP: textboxID= "Textbox1"Runat= "Server" > </ASP: textbox>
</Form>
<P>
<AHref= "Default5.aspx">Default5.aspx</A> </P>
</Body>
</Html>