call body tag from content page

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Hi Experts,

I have a master page with body tag looks like this:

ASP.NET

<body  runat="server" id="pageBody">

I need to change the body background image according to user choice from dropdownlist.
So I called master page body tag in content page code behind (dropdownlist selectedIndexChanged) like the following:

C#

HtmlGenericControl body = HtmlGenericControl)Master.FindControl("pageBody");

and then i did the following to change the background attribute:

C#

body.Attributes["style"] = "background: url('img/ic-vehicles/" + year_reg.SelectedItem.Text + "-" + make_reg.SelectedItem.Text + "-" + model_reg.SelectedItem.Text + "-" + trim + ".jpg') center center no-repeat ;background-attachment: fixed;";</pre>

The background is not changing!
I made sure the path is correct using this code:

C#

bool isexist = File.Exists(Server.MapPath("img/ic-vehicles/" + year_reg.SelectedItem.Text + "-" + make_reg.SelectedItem.Text + "-" + model_reg.SelectedItem.Text + "-" + trim + ".jpg"));

EDIT: forgot to say when I put break point i see this exception:

C#

base {System.Web.UI.HtmlControls.HtmlContainerControl} = {InnerText = '((System.Web.UI.HtmlControls.HtmlContainerControl)(((System.Web.UI.HtmlControls.HtmlGenericControl)(body)))).InnerText' threw an exception of type 'System.Web.HttpException'}

Any suggestions?

Thank you

Posted 1-May-15 6:42am

Samira Radwan

Updated 1-May-15 6:45am

v2

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Comments

ZurdoDev 1-May-15 13:01pm

HtmlGenericControl has a Style property. I've had to use that before when Attributes did not work.

Samira Radwan 1-May-15 13:58pm

still not showing using Style. thanks

ZurdoDev 1-May-15 14:00pm

View source in the browser and see what it's being set to. Url is probably wrong.

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-05-01T07:40:00

Solution 1

There is no such concept as "call a tag". With JavaScript, you can change the body background by changing its style at any time. For example:

JavaScript

document.body.style.background = "#faa85b url('background.png')";

—SA

Posted 1-May-15 7:40am

Sergey Alexandrovich Kryukov

Comments

Samira Radwan 1-May-15 13:56pm

thanks for explaining (call a tag) :)
what i meant is to change the body background image according to dropdownlist selection.
I need to do it using c# code not javaScript.
Thank you.

Sergey Alexandrovich Kryukov 1-May-15 14:10pm

C#?! Why? Why would you need an additional totally superfluous postback. This is easy with C#, but do it with JavaScript. Take whatever style you want based on select value.
—SA