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: www/media/common/util.js
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- Committer: mattgiuca
- Date: 2008-01-10 03:02:34 UTC
- Revision ID: svn-v3-trunk0:2b9c9e99-6f39-0410-b283-7f802c844ae2:trunk:155
login: Fix exception when user or pass is not supplied in a POST request.
- files removed:
- www/apps/fileservice/action.py
- www/media/browser
- www/media/common
- files modified:
- www/apps/browser/__init__.py
added
removed
www/media/common/util.js
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/* IVLE - Informatics Virtual Learning Environment
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* Copyright (C) 2007-2008 The University of Melbourne
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Module: JavaScript Utilities
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* Author: Matt Giuca
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* Date: 11/1/2008
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*
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* Defines some generic JavaScript utility functions.
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*/
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/** Removes all children of a given DOM element
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* \param elem A DOM Element. Will be modified.
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*/
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function dom_removechildren(elem)
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{
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while (elem.lastChild != null)
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elem.removeChild(elem.lastChild);
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}
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/** Creates a DOM element with simple text inside it.
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* \param tagname String. Name of the element's tag (eg. "p").
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* \param text String. Text to be placed inside the element.
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* \return DOM Element object.
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*/
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function dom_make_text_elem(tagname, text)
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{
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var elem = document.createElement(tagname);
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elem.appendChild(document.createTextNode(text));
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return elem;
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}
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/** Creates a DOM element with hyperlinked text inside it.
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* \param tagname String. Name of the element's tag (eg. "p").
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* \param text String. Text to be placed inside the element.
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* \param href String. URL the text will link to. This is a raw string,
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* it will automatically be URL-encoded.
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* \param onclick Optional string. Will be set as the "onclick" attribute
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* of the "a" element.
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* \return DOM Element object.
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*/
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function dom_make_link_elem(tagname, text, href, onclick)
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{
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var elem = document.createElement(tagname);
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var link = document.createElement("a");
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link.setAttribute("href", encodeURI(href));
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if (onclick != null)
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link.setAttribute("onclick", onclick);
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link.appendChild(document.createTextNode(text));
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elem.appendChild(link);
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return elem;
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}
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/** Converts a list of directories into a path name, with a slash at the end.
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* \param pathlist List of strings.
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* \return String.
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*/
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function pathlist_to_path(pathlist)
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{
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ret = "";
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for (var i=0; i<pathlist.length; i++)
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{
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ret += pathlist[i] + "/";
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}
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return ret;
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}
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/** Given a URL, returns an object containing a number of attributes
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* describing the components of the URL, similar to CGI request variables.
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* The object has the following attributes:
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* - scheme
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* - server_name
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* - server_port
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* - path
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* - query_string
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* - args
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* The first five of these are strings, which comprise the URL as follows:
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* <scheme> "://" <server_name> ":" <server_port> <path> "?" <query_string>
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* Any of these strings may be set to null if not found.
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*
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* "args" is an object whose attributes are the query_string arguments broken
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* up.
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* Args values are strings for single values, arrays of strings for values
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* whose names appear multiple times.
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* args is never null, though it may be empty.
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*
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* The args strings are decoded from URL encoding form. Other strings are left
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* in raw URL form.
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*
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* \param url String. A URL. To read from the current browser window, use
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* window.location.href.
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* \return The above described object.
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*/
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function parse_url(url)
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{
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var obj = {};
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var index;
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var serverpart;
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var args;
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/* Split scheme from rest */
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index = url.indexOf("://");
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if (index < 0)
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obj.scheme = null;
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else
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{
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obj.scheme = url.substr(0, index);
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url = url.substr(index+3);
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}
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/* Split server name/port from rest */
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index = url.indexOf("/");
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if (index < 0)
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{
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serverpart = url;
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url = null;
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}
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else
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{
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serverpart = url.substr(0, index);
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url = url.substr(index+1);
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}
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/* Split server name from port */
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index = serverpart.indexOf(":");
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if (index < 0)
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{
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obj.server_name = serverpart;
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obj.server_port = null;
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}
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else
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{
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obj.server_name = serverpart.substr(0, index);
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obj.server_port = serverpart.substr(index+1);
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}
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/* Split path from query string */
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if (url == null)
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{
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obj.path = null;
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obj.query_string = null;
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}
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else
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{
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index = url.indexOf("?");
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if (index < 0)
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{
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obj.path = url;
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obj.query_string = null;
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}
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else
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{
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obj.path = url.substr(0, index);
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obj.query_string = url.substr(index+1);
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}
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}
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/* Split query string into arguments */
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args = {};
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if (obj.query_string != null)
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{
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var args_strs = obj.query_string.split("&");
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var arg_str;
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var arg_key, arg_val;
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for (var i=0; i<args_strs.length; i++)
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{
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arg_str = args_strs[i];
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index = arg_str.indexOf("=");
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/* Ignore malformed args */
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if (index >= 0)
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{
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arg_key = decodeURI(arg_str.substr(0, index));
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arg_val = decodeURI(arg_str.substr(index+1));
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if (arg_key in args)
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{
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/* Collision - make an array */
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if (args[arg_key] instanceof Array)
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args[arg_key][args[arg_key].length] = arg_val;
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else
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args[arg_key] = [args[arg_key], arg_val];
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}
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else
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args[arg_key] = arg_val;
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}
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}
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}
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obj.args = args;
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return obj;
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}
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/** Given an object exactly of the form described for the output of parseurl,
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* returns a URL string built from those parameters.
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* parseurl and buildurl are strict inverses of each other.
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* Note that either query_string or args may be supplied. If both are
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* supplied, query_string is preferred (because it keeps the argument order).
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* If you take a url from parseurl, modify args, and pass to buildurl,
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* you need to set query_string to null to use the new args.
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* \param obj Object as returned by parseurl.
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* \return String, a URL.
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*/
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function buildurl(obj)
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{
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var url = "";
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var query_string = null;
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if (!("scheme" in obj) || obj.scheme != null)
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url = obj.scheme.toString() + "://";
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if (!("server_name" in obj) || obj.server_name != null)
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url += obj.server_name.toString();
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if (!("server_port" in obj) || obj.server_port != null)
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url += ":" + obj.server_port.toString();
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if (!("path" in obj) || obj.path != null)
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{
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var path = obj.path.toString();
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if (path.length > 0 && path[0] != "/")
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path = "/" + path;
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url += path;
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}
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if (!("query_string" in obj) || obj.query_string != null)
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query_string = obj.query_string.toString();
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else if (!("args" in obj) || obj.args != null)
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{
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query_string = "";
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var arg_val;
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for (var arg_key in obj.args)
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{
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arg_val = obj.args[arg_key];
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if (arg_val instanceof Array)
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for (var i=0; i<arg_val.length; i++)
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query_string += "&" + encodeURI(arg_key) + "=" +
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encodeURI(arg_val[i]);
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else
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query_string += "&" + encodeURI(arg_key) + "=" +
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encodeURI(arg_val);
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}
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if (query_string == "")
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query_string = null;
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else
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/* Drop the first "&" */
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query_string = query_string.substr(1);
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}
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if (query_string != null)
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url += "?" + query_string;
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return url;
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}
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/** Given an argument map, as output in the args parameter of the return of
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* parseurl, gets the first occurence of an argument in the URL string.
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* If the argument was not found, returns null.
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* If there was a single argument, returns the argument.
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* If there were multiple arguments, returns the first.
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* \param args Object mapping arguments to strings or arrays of strings.
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* \param arg String. Argument name.
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* \return String.
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*/
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function arg_getfirst(args, arg)
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{
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if (!(arg in args))
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return null;
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var r = args[arg];
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if (r instanceof Array)
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return r[0];
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else
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return r;
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}
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/** Given an argument map, as output in the args parameter of the return of
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* parseurl, gets all occurences of an argument in the URL string, as an
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* array.
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* If the argument was not found, returns [].
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* Otherwise, returns all occurences as an array, even if there was only one.
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* \param args Object mapping arguments to strings or arrays of strings.
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* \param arg String. Argument name.
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* \return Array of strings.
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*/
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function arg_getlist(args, arg)
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{
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if (!(arg in args))
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return [];
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var r = args[arg];
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if (r instanceof Array)
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return r;
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else
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return [r];
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}
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