Is there a System.Web.UI.ClientScriptManager metho

2019-06-06 09:30发布

站内问答 / JavaScript
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I know it's strictly OK to put <script> tags in the body, but in the interest of neatness I'd like to use System.Web.UI.ClientScriptManager to register a script in the <head> of my page. Is there a method to accomplish this?

Thanks in advance.

1条回答
仙女界的扛把子
2楼-- · 2019-06-06 10:01

In these cases I usually add a ContentPlaceHolder in the tag of my Master Page.

Alternately I've used a method (usually in a utility class or PageBase class) that puts the script string in a List and stores it in the ASP.Net Context like so:

            List<string> javaScriptUrls = new List<string>();

            url = url.ToLower();

            javaScriptUrls = Context.Items[JS_KEY] as List<string>;

            if (javaScriptUrls == null)
            {
                javaScriptUrls = new List<string>();

                javaScriptUrls.Add(url);
            }
            else
            {
                if (!javaScriptUrls.Contains(url))
                    javaScriptUrls.Add(url);
            }

            Context.Items[JS_KEY] = javaScriptUrls;

Then OnPreRender of the MasterPage, it reads this List from the Context and builds tags in the header.

            List<string> _javaScript = Context.Items[JS_KEY] as List<string>;

            foreach (string js in _javaScript)
            {
                HtmlGenericControl script = new HtmlGenericControl();
                script.TagName = "script";
                script.Attributes.Add("type", "text/javascript");
                if (js.StartsWith("~/"))
                    script.Attributes.Add("src", head.ResolveUrl(js));
                else
                    script.Attributes.Add("src", js);

                head.Controls.Add(script);

                AddHeaderLineBreak(head);
            }
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