initial commit

2011-11-22 23:30:42 -06:00
commit d421c1321b
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+/*
+ * autoscroll.js widget with jquery event(s)
+ * Copyright 2011 Michael Whitford <michael@alwandassociates.com>
+ * License: BSD
+ */
+
+// toggle - id of the toggle element for the click event
+// textarea  - id of the textarea to autoscroll
+var toggleAutoScroll = function (toggle, textarea) {
+    var autoScrollDebug = false;
+    var state = toggle + 'interval';
+    var scrollOn = function() {
+        if (autoScrollDebug) { console.log('on:', toggle, textarea); }
+        var onAnimation = function(name, target) {
+            jQuery('#' + name).unbind().click(function() {
+                toggleAutoScroll(name, target);
+            }).fadeTo(350, 1);
+        };
+        // uses obj attached to window for state
+        window[state] = {};
+        window[state].name = toggle;
+        window[state].target = textarea;
+        // get a handle to the textarea el
+        var area = jQuery('#' + textarea);
+        // set the interval
+        window[state].interval = setInterval(function() {
+            // ui hack?  needs more testing
+            area[0].scrollTop = area[0].scrollHeight;
+        }, 2500);  // 2.5 seconds
+        onAnimation(toggle, textarea);
+    };
+    var scrollOff = function() {
+        if (autoScrollDebug) { console.log('off:', toggle, textarea); }
+        var offAnimation = function(name, target) {
+            jQuery('#' + name).unbind().click(function() {
+                    toggleAutoScroll(name, target);
+                }).fadeTo(350, 0.55);
+        };
+        offAnimation(toggle, textarea);
+        clearInterval(window[state].interval);
+        window[state] = undefined;
+    };
+    if (arguments.length == 2) {
+        if (typeof window[state] === 'undefined') {
+            scrollOn();
+        } else {
+            scrollOff();
+        }
+    }
+    return;
+};
+
+// jquery onready
+
+jQuery(document).ready(function () {
+    // turn it on by default
+    toggleAutoScroll('autoscroll', 'output');
+});
+
+// todo: some key - toggle off
+// todo: drag scrollbar up - toggle off
+// todo: drag scrollbar to bottom - toggle off