Merge pull request #780 from kukanya/master

[ScrollDown] Initial commit

src/jupyter_contrib_nbextensions/nbextensions/scroll_down/config.yaml

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+Type: IPython Notebook Extension
+Name: ScrollDown
+Description: Scroll outputs down automatically
+Link: readme.md
+Icon: icon.png
+Main: main.js
+Compatibility: 4.x

src/jupyter_contrib_nbextensions/nbextensions/scroll_down/main.js

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+define([
+    'base/js/namespace',
+    'services/config',
+    'base/js/utils',
+    'jquery'
+], function (Jupyter,
+             configmod,
+             utils,
+             $) {
+    'use strict';
+
+    var base_url = utils.get_body_data('baseUrl');
+    var config = new configmod.ConfigSection('notebook', {base_url: base_url});
+
+    var params = {
+        scrollDownIsEnabled: false
+    };
+
+    config.loaded.then(function () {
+        $.extend(true, params, config.data);
+        setButtonColor();
+    });
+
+    function toggleScrollDown() {
+        params.scrollDownIsEnabled = !params.scrollDownIsEnabled;
+        config.update(params);
+        setButtonColor();
+    }
+
+    function setButtonColor() {
+        var bg = params.scrollDownIsEnabled ? "darkgray" : "";
+        $("#toggle_scroll_down").css("background-color",  bg);
+    }
+
+    function load_extension() {
+        Jupyter.toolbar.add_buttons_group([
+            {
+                id: 'toggle_scroll_down',
+                label: 'toggle automatic scrolling down',
+                icon: 'fa-angle-double-down ',
+                callback: toggleScrollDown
+            }
+        ]);
+
+        console.log("[ScrollDown] is loaded");
+
+        $(".output").on("resize", function () {
+            if (!params.scrollDownIsEnabled) return;
+            var output = $(this);
+            setTimeout(function () {
+                output.scrollTop(output.prop("scrollHeight"));
+                console.log("height: " + output.prop("scrollHeight"));
+            }, 0);
+        });
+
+        config.load();
+    }
+
+    return {
+        load_jupyter_extension: load_extension,
+        load_ipython_extension: load_extension
+    }
+});

src/jupyter_contrib_nbextensions/nbextensions/scroll_down/readme.md

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+# Description
+
+When enabled, scroll cells' outputs down automatically.