To change color with a push-button

Mirco

I must make a aspx page that make these single steps:
1. when I open it is green
2. when I click a button it is blue
3. when I click the same button it is red

alternate 2 and 3

I have written this code but it does not work. Which thing I am mistaking?

Expand|Select|Wrap|Line Numbers

  
<%@ Page Language="C#"%>
 
<script runat="server">
 
bool T=false;

int a=1;
 
protected void Page_Load(Object Src, EventArgs E)

{

Sfondo.Attributes.Add("bgcolor", "#00ff00");

}
 
void Cambia_Sfondo(Object Src, EventArgs E)

{

T=!T;

if (T)

{

Sfondo.Attributes.Add("bgcolor", "#0000ff");

}

else

{

Sfondo.Attributes.Add("bgcolor", "#ff0000");

}

a++;

}
 
</script>
 
<html>

<body id="Sfondo" runat="server">

<form runat="server">

<asp:Button OnClick="Cambia_Sfondo" Text="Cambia Sfondo" Height="20"

Width="80" runat="server"/>

<br><%Response.Write("A= " + a);%>

</form>

</body>

</html>

Nov 19 '05 #1

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1359

garethdjames

Firstly the boolean logic won't work, secondly you need to store the
value of i in either viewstate or the session each time, try this code

<script runat="server">

protected void Page_Load(Object Src, EventArgs E)
{
if(!Page.isPostback)
{
Sfondo.Attributes.Add("bgcolor", "#00ff00");
int i=0;
ViewState["num"]=i;
}
}

void Cambia_Sfondo(Object Src, EventArgs E)
{
int i = (int)ViewState["num"];
if (i==0)
{
Sfondo.Attributes.Add("bgcolor", "#0000ff");
i++;
}
else
{
Sfondo.Attributes.Add("bgcolor", "#ff0000");
i = 0;
}
ViewState["num] = i;
}

</script>

Nov 19 '05 #2

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