add function to support download

src/static/js/utils.js

@@ -0,0 +1,52 @@
+function download(cy) {
+	$("#DownloadPNGButton").click(function(){
+        var a = document.createElement('a');
+        a.href = cy.png();
+        a.download = 'api_map.png';
+        a.click();
+    });
+    $("#DownloadJSONButton").click(function() {
+    	var dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(cy.json()));
+		var dlAnchorElem = document.getElementById('downloadAnchorElem');
+		dlAnchorElem.setAttribute("href",     dataStr     );
+		dlAnchorElem.setAttribute("download", "biothings_explorer_data.json");
+		dlAnchorElem.click();
+	$("#DownloadCodeButton").click(function() {
+		var path = ['ncbigene', 'http://mygene.info/v3/gene/{geneid}', 'hgnc.symbol']
+		download_file('my_file.py', dynamic_text(path, '1017'), 'text/plain');
+	})
+    })
+}
+var COMMENT_LINE = "###############\n"
+var IMPORT_LINE = COMMENT_LINE + "#Import biothings_explorer python package\n" + COMMENT_LINE + "from biothings_explorer import BioThingsExplorer\n"
+var INITIATE_LINE = COMMENT_LINE + "#Start biothings_explorer instance\n" + COMMENT_LINE + "t = BioThingsExplorer()\n"
+var DEFINE_PATH_LINE = COMMENT_LINE + "#Here is the exploration path you select\n" + COMMENT_LINE + "PATH = path_list\n"
+var DEFINE_INPUT_LINE = COMMENT_LINE + "#Here is the input you give\n" + COMMENT_LINE + "INPUT = input_value\n"
+var EXPLORE_PATH_LINE = COMMENT_LINE + "#Here is the function to extract the output\n" + COMMENT_LINE + "output = t.find_output(t.path_conversion(PATH), INPUT, display_graph=False\n"
+var FINAL_COMMENT = "#If you are using jupyter notebook, set display_graph to True\n#This will display the graph on the jupyter notebook cell\n#You can do further data analysis using output.edges(), output.nodes()\n"
+
+    function dynamic_text(path, _input) {
+	    var final_string = IMPORT_LINE + INITIATE_LINE + DEFINE_PATH_LINE.replace('path_list', JSON.stringify(path)) + DEFINE_INPUT_LINE.replace('input_value', _input) + EXPLORE_PATH_LINE + FINAL_COMMENT;
+	    console.log(final_string);
+        return final_string;
+    }
+
+    function download_file(name, contents, mime_type) {
+        mime_type = mime_type || "text/plain";
+
+        var blob = new Blob([contents], {type: mime_type});
+
+        var dlink = document.createElement('a');
+        dlink.download = name;
+        dlink.href = window.URL.createObjectURL(blob);
+        dlink.onclick = function(e) {
+            // revokeObjectURL needs a delay to work properly
+            var that = this;
+            setTimeout(function() {
+                window.URL.revokeObjectURL(that.href);
+            }, 1500);
+        };
+
+        dlink.click();
+        dlink.remove();
+    }