从内容页面调用body标签 [英] call body tag from content page
问题描述
嗨专家，
我有一个带有body标签的母版页如下：
Hi Experts,
I have a master page with body tag looks like this:
<body runat="server" id="pageBody">
我需要根据用户选择从下拉列表中更改正文背景图像。
所以我在后面的内容页面代码中调用了主页正文标记（dropdownlist selectedIndexChanged），如下所示： br />
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:
HtmlGenericControl body = HtmlGenericControl)Master.FindControl("pageBody");
然后我做了以下更改背景属性：
and then i did the following to change the background attribute:
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>
背景不变！
我使用此代码确保路径正确：
The background is not changing!
I made sure the path is correct using this code:
bool isexist = File.Exists(Server.MapPath("img/ic-vehicles/" + year_reg.SelectedItem.Text + "-" + make_reg.SelectedItem.Text + "-" + model_reg.SelectedItem.Text + "-" + trim + ".jpg"));
编辑 ：忘了说当我提出断点时我看到了这个例外：
EDIT: forgot to say when I put break point i see this exception:
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'}
有什么建议吗？
谢谢
Any suggestions?
Thank you
推荐答案
没有召唤标签这样的概念。使用JavaScript，您可以随时通过更改其样式来更改正文背景。例如：
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:
document.body.style.background = "#faa85b url('background.png')";
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