From bae957cd80e59f16fe011dda45ce2624e2ffd4d2 Mon Sep 17 00:00:00 2001
From: Tom <tw201207@gmail.com>
Date: Wed, 12 Nov 2014 20:19:29 +0100
Subject: Support for adding bottom scripts

Needed if we want to have opacity changes in image diffs because
jQuery is bottom-loaded, so we must ensure that any scripts using
jQuery are run later.

I'm not a Wicket expert; maybe there's a cleverer or cleaner way to do
this. There is a JavascriptUtils class in Wicket, but that writes to
the response -- I don't quite see how that would give me control over
the precise placement of the scripts to ensure they come after that
bottom-loaded jQuery.
---
 .../java/com/gitblit/wicket/pages/BasePage.html    |  1 +
 .../java/com/gitblit/wicket/pages/BasePage.java    | 39 ++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/src/main/java/com/gitblit/wicket/pages/BasePage.html b/src/main/java/com/gitblit/wicket/pages/BasePage.html
index 7aa78360..b998428c 100644
--- a/src/main/java/com/gitblit/wicket/pages/BasePage.html
+++ b/src/main/java/com/gitblit/wicket/pages/BasePage.html
@@ -51,5 +51,6 @@
 		<!-- Include scripts at end for faster page loading -->
 		<script type="text/javascript" src="bootstrap/js/jquery.js"></script>
 		<script type="text/javascript" src="bootstrap/js/bootstrap.js"></script>		
+		<wicket:container wicket:id="bottomScripts"></wicket:container>
 	</body>
 </html>
\ No newline at end of file
diff --git a/src/main/java/com/gitblit/wicket/pages/BasePage.java b/src/main/java/com/gitblit/wicket/pages/BasePage.java
index b6967003..534c196b 100644
--- a/src/main/java/com/gitblit/wicket/pages/BasePage.java
+++ b/src/main/java/com/gitblit/wicket/pages/BasePage.java
@@ -35,6 +35,7 @@ import javax.servlet.http.HttpServletRequest;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.wicket.Application;
+import org.apache.wicket.Component;
 import org.apache.wicket.Page;
 import org.apache.wicket.PageParameters;
 import org.apache.wicket.RedirectToUrlException;
@@ -42,6 +43,8 @@ import org.apache.wicket.markup.html.CSSPackageResource;
 import org.apache.wicket.markup.html.basic.Label;
 import org.apache.wicket.markup.html.link.ExternalLink;
 import org.apache.wicket.markup.html.panel.FeedbackPanel;
+import org.apache.wicket.markup.html.resources.JavascriptResourceReference;
+import org.apache.wicket.markup.repeater.RepeatingView;
 import org.apache.wicket.protocol.http.RequestUtils;
 import org.apache.wicket.protocol.http.WebResponse;
 import org.apache.wicket.protocol.http.servlet.ServletWebRequest;
@@ -75,11 +78,13 @@ public abstract class BasePage extends SessionPage {
 
 	public BasePage() {
 		super();
+		add(new RepeatingView("bottomScripts").setRenderBodyOnly(true));
 		customizeHeader();
 	}
 
 	public BasePage(PageParameters params) {
 		super(params);
+		add(new RepeatingView("bottomScripts").setRenderBodyOnly(true));
 		customizeHeader();
 	}
 
@@ -506,4 +511,38 @@ public abstract class BasePage extends SessionPage {
 		return sb.toString();
 	}
 
+	/**
+	 * Adds a HTML script element loading the javascript designated by the given path.
+	 *
+	 * @param scriptPath
+	 *            page-relative path to the Javascript resource; normally starts with "script/"
+	 */
+	protected void addBottomScript(String scriptPath) {
+		Component bottomScriptContainer = get("bottomScripts");
+		if (bottomScriptContainer instanceof RepeatingView) {
+			// Always true.
+			RepeatingView bottomScripts = (RepeatingView) bottomScriptContainer;
+			Label script = new Label(bottomScripts.newChildId(), "<script type='text/javascript' src='"
+					+ urlFor(new JavascriptResourceReference(this.getClass(), scriptPath)) + "'></script>\n");
+			bottomScripts.add(script.setEscapeModelStrings(false).setRenderBodyOnly(true));
+		}
+	}
+
+	/**
+	 * Adds a HTML script element containing the given code.
+	 *
+	 * @param code
+	 *            inline script code
+	 */
+	protected void addBottomScriptInline(String code) {
+		Component bottomScriptContainer = get("bottomScripts");
+		if (bottomScriptContainer instanceof RepeatingView) {
+			// Always true.
+			RepeatingView bottomScripts = (RepeatingView) bottomScriptContainer;
+			Label script = new Label(bottomScripts.newChildId(),
+					"<script type='text/javascript'>/*<![CDATA[*/\n" + code + "\n//]]>\n</script>\n");
+			bottomScripts.add(script.setEscapeModelStrings(false).setRenderBodyOnly(true));
+		}
+	}
+
 }
-- 
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