1
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function SDMenu(id) {
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2
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if (!document.getElementById || !document.getElementsByTagName)
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return false;
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4
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this.menu = document.getElementById(id);
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this.submenus = this.menu.getElementsByTagName("div");
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this.remember = true;
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this.speed = 3;
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this.markCurrent = true;
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9
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this.oneSmOnly = false;
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10
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}
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11
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SDMenu.prototype.init = function() {
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var mainInstance = this;
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for (var i = 0; i < this.submenus.length; i++)
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this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
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mainInstance.toggleMenu(this.parentNode);
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};
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if (this.markCurrent) {
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var links = this.menu.getElementsByTagName("a");
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for (var i = 0; i < links.length; i++)
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if (links[i].href == document.location.href) {
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links[i].className = "current";
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break;
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}
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}
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if (this.remember) {
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var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
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var match = regex.exec(document.cookie);
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if (match) {
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29
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var states = match[1].split("");
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30
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for (var i = 0; i < states.length; i++)
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31
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this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
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32
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}
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}
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};
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SDMenu.prototype.toggleMenu = function(submenu) {
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if (submenu.className == "collapsed")
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this.expandMenu(submenu);
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38
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else
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39
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this.collapseMenu(submenu);
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40
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};
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SDMenu.prototype.expandMenu = function(submenu) {
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var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
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var links = submenu.getElementsByTagName("a");
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44
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for (var i = 0; i < links.length; i++)
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fullHeight += links[i].offsetHeight;
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46
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var moveBy = Math.round(this.speed * links.length);
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48
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var mainInstance = this;
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49
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var intId = setInterval(function() {
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50
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var curHeight = submenu.offsetHeight;
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var newHeight = curHeight + moveBy;
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52
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if (newHeight < fullHeight)
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submenu.style.height = newHeight + "px";
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54
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else {
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55
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clearInterval(intId);
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56
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submenu.style.height = "";
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57
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submenu.className = "";
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58
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mainInstance.memorize();
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59
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}
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60
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}, 30);
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61
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this.collapseOthers(submenu);
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};
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63
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SDMenu.prototype.collapseMenu = function(submenu) {
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var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
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var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
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66
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var mainInstance = this;
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67
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var intId = setInterval(function() {
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68
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var curHeight = submenu.offsetHeight;
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69
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var newHeight = curHeight - moveBy;
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70
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if (newHeight > minHeight)
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submenu.style.height = newHeight + "px";
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72
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else {
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clearInterval(intId);
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submenu.style.height = "";
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submenu.className = "collapsed";
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mainInstance.memorize();
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77
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}
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78
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}, 30);
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79
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};
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80
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SDMenu.prototype.collapseOthers = function(submenu) {
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81
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if (this.oneSmOnly) {
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for (var i = 0; i < this.submenus.length; i++)
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if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
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84
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this.collapseMenu(this.submenus[i]);
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85
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}
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86
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};
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87
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SDMenu.prototype.expandAll = function() {
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88
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var oldOneSmOnly = this.oneSmOnly;
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this.oneSmOnly = false;
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90
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for (var i = 0; i < this.submenus.length; i++)
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91
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if (this.submenus[i].className == "collapsed")
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92
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this.expandMenu(this.submenus[i]);
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93
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this.oneSmOnly = oldOneSmOnly;
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94
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};
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95
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SDMenu.prototype.collapseAll = function() {
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96
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for (var i = 0; i < this.submenus.length; i++)
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97
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if (this.submenus[i].className != "collapsed")
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98
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this.collapseMenu(this.submenus[i]);
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99
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};
|
100
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SDMenu.prototype.memorize = function() {
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101
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if (this.remember) {
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102
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var states = new Array();
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|
103
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for (var i = 0; i < this.submenus.length; i++)
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104
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states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
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105
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var d = new Date();
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106
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d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
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107
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document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
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108
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}
|
109
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}; |
Consider adding curly braces around all statements when they are executed conditionally. This is optional if there is only one statement, but leaving them out can lead to unexpected behaviour if another statement is added later.
Consider:
If you or someone else later decides to put another statement in, only the first statement will be executed.
In this case the statement
b = 42
will always be executed, while the logging statement will be executed conditionally.ensures that the proper code will be executed conditionally no matter how many statements are added or removed.