Add floating window for new threads

New threads get a floating window just like new replies have. This only
pops up on the board detail view.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/static/board/post.js

@@ -1,6 +1,7 @@
 const OPEN = "open";
 const CLOSED = "closed";
 const replyWindowName = "reply-window";
+const postWindowName = "post-window";
 
 function documentClick(e) {
     let sender = e.target;
@@ -59,7 +60,7 @@ function openReplyWindow(replyUrl) {
     if (window.top.jsFrame.containsWindowName(replyWindowName)) {
         // if there's already a new reply window, don't override it and just let
         // it continue to exist.
-        return;
+        return getReplyWindow();
     }
 
     let replyWindow = window.top.jsFrame.create({
@@ -70,6 +71,7 @@ function openReplyWindow(replyUrl) {
         url: replyUrl
     });
     replyWindow.show();
+    return replyWindow;
 }
 
 function getReplyWindow() {
@@ -77,18 +79,49 @@ function getReplyWindow() {
 }
 
 function replyTextbox() {
-    return $("iframe").contents().find("#id_text");
+    replyWindow = getReplyWindow();
+    if (!replyWindow) {
+        return null;
+    }
+
+    return replyWindow.$("#id_text")
 }
 
 function replyAppend(toAdd) {
+    let replyWindow = getReplyWindow();
     let textbox = replyTextbox();
-    if (textbox.length === 0) {
+    if (!textbox) {
+        $(replyWindow.iframe, "#id_text").on("load", (e) => {
+            replyAppend(toAdd);
+        })
+    } else {
+        let caret = textbox.selectionStart;
+        textbox = $(textbox);
+        let text = textbox.val();
+        textbox.val(text.substring(0, caret) + toAdd + text.substring(caret));
+        textbox.focus();
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Reply window
+////////////////////////////////////////////////////////////////////////////////
+function openPostWindow(postUrl) {
+    if (window.top.jsFrame.containsWindowName(postWindowName)) {
         return;
     }
-    let caret = textbox[0].selectionStart;
-    let text = textbox.val();
-    textbox.val(text.substring(0, caret) + toAdd + text.substring(caret));
-    textbox.focus();
+    let postWindow = window.top.jsFrame.create({
+        title: "New Thread",
+        name: postWindowName,
+        width: 385,
+        height: 350,
+        url: postUrl,
+    });
+    postWindow.show();
+}
+
+function getPostWindow() {
+    return window.top.jsFrame.getWindowByName(postWindowName);
 }
 
 ////////////////////////////////////////////////////////////////////////////////