Use webcomponents in existing ASP.NET WebForms application
Question
I have an large existing ASP.NET WebForms application. This application has a masterpage who manager security, navigation, ... Pages developped are in a ContentPlaceHolder.
I would like to develop new pages in JS with web components. To use a web component on a page, it must be imported ( <link rel="import" href="..."> ). This import must be on the <head> part of the page. In my case, the <head> is on the master page. So I have to import all the existing web components in the master page to be able to use them.
It does not sound like a very good idea.
How can I do it otherwise ?
2 answers
solution1
3 ACCPTED 2017-02-02 17:45:25
Asp.Net lets you place ContentPlaceHolder in head tag. You can load the web components required by the page instead of loading them all in Master Page.
Master Page
<html>
<head runat="server">
<title></title>
<asp:ContentPlaceHolder ID="cpHead" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ContentPlaceHolder ID="cpBody" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
Web Form
<asp:Content ID="Content1" ContentPlaceHolderID="cpHead" runat="server">
<link rel="import" href="...">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cpBody" runat="server">
</asp:Content>
Your HTML will look like
<html>
<head>
<title></title>
<link href="..." rel="import">
</head>
<body>
</body>
</html>
solution2
0 2017-02-02 17:43:27
You would normally use RegisterClientScriptInclude . This will add the script file to the top of the page, but not in the <head> .
ClientScript.RegisterClientScriptInclude("myScript", "myJavaScriptFile.js");
If you really want it in the <head> you need to use a HtmlGenericControl
HtmlGenericControl genericControl = new HtmlGenericControl("script");
genericControl.Attributes.Add("type", "text/javascript");
genericControl.Attributes.Add("src", "myJavaScriptFile.js");
this.Page.Header.Controls.Add(genericControl);
It does not matter where you place this code (Master, Page, User Control). Aspnet will ensure they end up in the right place client side.
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