include/webutil.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2010 Joel Martin
   4  * Licensed under LGPL-3 (see LICENSE.txt)
   5  *
   6  * See README.md for usage and integration instructions.
   7  */
   8
   9 "use strict";
  10 /*jslint bitwise: false, white: false */
  11 /*global window, document */
  12
  13 // Globals defined here
  14 var WebUtil = {}, $D;
  15
  16 /*
  17  * Simple DOM selector by ID
  18  */
  19 if (!window.$D) {
  20     $D = function (id) {
  21         if (document.getElementById) {
  22             return document.getElementById(id);
  23         } else if (document.all) {
  24             return document.all[id];
  25         } else if (document.layers) {
  26             return document.layers[id];
  27         }
  28         return undefined;
  29     };
  30 }
  31
  32
  33 /*
  34  * ------------------------------------------------------
  35  * Namespaced in WebUtil
  36  * ------------------------------------------------------
  37  */
  38
  39 // init log level reading the logging HTTP param
  40 WebUtil.init_logging = function() {
  41     Util._log_level = (document.location.href.match(
  42          /logging=([A-Za-z0-9\._\-]*)/) ||
  43          ['', Util._log_level])[1];
  44
  45     Util.init_logging()
  46 }
  47 WebUtil.init_logging();
  48
  49
  50 WebUtil.dirObj = function (obj, depth, parent) {
  51     var i, msg = "", val = "";
  52     if (! depth) { depth=2; }
  53     if (! parent) { parent= ""; }
  54
  55     // Print the properties of the passed-in object
  56     for (i in obj) {
  57         if ((depth > 1) && (typeof obj[i] === "object")) {
  58             // Recurse attributes that are objects
  59             msg += WebUtil.dirObj(obj[i], depth-1, parent + "." + i);
  60         } else {
  61             //val = new String(obj[i]).replace("\n", " ");
  62             val = obj[i].toString().replace("\n", " ");
  63             if (val.length > 30) {
  64                 val = val.substr(0,30) + "...";
  65             }
  66             msg += parent + "." + i + ": " + val + "\n";
  67         }
  68     }
  69     return msg;
  70 };
  71
  72 // Read a query string variable
  73 WebUtil.getQueryVar = function(name, defVal) {
  74     var re = new RegExp('[?][^#]*' + name + '=([^&#]*)');
  75     if (typeof defVal === 'undefined') { defVal = null; }
  76     return (document.location.href.match(re) || ['',defVal])[1];
  77 };
  78
  79
  80 /*
  81  * Cookie handling. Dervied from: http://www.quirksmode.org/js/cookies.html
  82  */
  83
  84 // No days means only for this browser session
  85 WebUtil.createCookie = function(name,value,days) {
  86     var date, expires;
  87     if (days) {
  88         date = new Date();
  89         date.setTime(date.getTime()+(days*24*60*60*1000));
  90         expires = "; expires="+date.toGMTString();
  91     }
  92     else {
  93         expires = "";
  94     }
  95     document.cookie = name+"="+value+expires+"; path=/";
  96 };
  97
  98 WebUtil.readCookie = function(name, defaultValue) {
  99     var i, c, nameEQ = name + "=", ca = document.cookie.split(';');
 100     for(i=0; i < ca.length; i += 1) {
 101         c = ca[i];
 102         while (c.charAt(0) === ' ') { c = c.substring(1,c.length); }
 103         if (c.indexOf(nameEQ) === 0) { return c.substring(nameEQ.length,c.length); }
 104     }
 105     return (typeof defaultValue !== 'undefined') ? defaultValue : null;
 106 };
 107
 108 WebUtil.eraseCookie = function(name) {
 109     WebUtil.createCookie(name,"",-1);
 110 };
 111
 112 /*
 113  * Alternate stylesheet selection
 114  */
 115 WebUtil.getStylesheets = function() { var i, links, sheets = [];
 116     links = document.getElementsByTagName("link");
 117     for (i = 0; i < links.length; i += 1) {
 118         if (links[i].title &&
 119             links[i].rel.toUpperCase().indexOf("STYLESHEET") > -1) {
 120             sheets.push(links[i]);
 121         }
 122     }
 123     return sheets;
 124 };
 125
 126 // No sheet means try and use value from cookie, null sheet used to
 127 // clear all alternates.
 128 WebUtil.selectStylesheet = function(sheet) {
 129     var i, link, sheets = WebUtil.getStylesheets();
 130     if (typeof sheet === 'undefined') {
 131         sheet = 'default';
 132     }
 133     for (i=0; i < sheets.length; i += 1) {
 134         link = sheets[i];
 135         if (link.title === sheet) {
 136             Util.Debug("Using stylesheet " + sheet);
 137             link.disabled = false;
 138         } else {
 139             //Util.Debug("Skipping stylesheet " + link.title);
 140             link.disabled = true;
 141         }
 142     }
 143     return sheet;
 144 };