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求助一个js代码的问题,有点急,谢谢! RRS feed

  • 问题

  • 下面有段代码,意思是一个滑动菜单,点击菜单就滑出子菜单,就像QQ那种菜单,只是这个js代码的菜单是每个根菜单可以单独独立的滑出和收起,我希望的是滑出一个菜单然后其他的菜单就会收起,js学的不好,请大家看看,谢谢。代码是我从.js文件里面直接copy过来的。

    function SDMenu(id) {
    	if (!document.getElementById || !document.getElementsByTagName)
    		return false;
    	this.menu = document.getElementById(id);
    	this.submenus = this.menu.getElementsByTagName("div");
    	this.remember = true;
    	this.speed = 3;
    	this.markCurrent = true;
    	this.oneSmOnly = false;
    }
    SDMenu.prototype.init = function() {
    	var mainInstance = this;
    	for (var i = 0; i < this.submenus.length; i++)
    		this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
    			mainInstance.toggleMenu(this.parentNode);
    		};
    	if (this.markCurrent) {
    		var links = this.menu.getElementsByTagName("a");
    		for (var i = 0; i < links.length; i++)
    			if (links[i].href == document.location.href) {
    				links[i].className = "current";
    				break;
    			}
    	}
    	if (this.remember) {
    		var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
    		var match = regex.exec(document.cookie);
    		if (match) {
    			var states = match[1].split("");
    			for (var i = 0; i < states.length; i++)
    				this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
    		}
    	}
    };
    SDMenu.prototype.toggleMenu = function(submenu) {
    	if (submenu.className == "collapsed")
    		this.expandMenu(submenu);
    	else
    		this.collapseMenu(submenu);
    };
    SDMenu.prototype.expandMenu = function(submenu) {
    	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
    	var links = submenu.getElementsByTagName("a");
    	for (var i = 0; i < links.length; i++)
    		fullHeight += links[i].offsetHeight;
    	var moveBy = Math.round(this.speed * links.length);
    	
    	var mainInstance = this;
    	var intId = setInterval(function() {
    		var curHeight = submenu.offsetHeight;
    		var newHeight = curHeight + moveBy;
    		if (newHeight < fullHeight)
    			submenu.style.height = newHeight + "px";
    		else {
    			clearInterval(intId);
    			submenu.style.height = "";
    			submenu.className = "";
    			mainInstance.memorize();
    		}
    	}, 30);
    	this.collapseOthers(submenu);
    };
    SDMenu.prototype.collapseMenu = function(submenu) {
    	var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
    	var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
    	var mainInstance = this;
    	var intId = setInterval(function() {
    		var curHeight = submenu.offsetHeight;
    		var newHeight = curHeight - moveBy;
    		if (newHeight > minHeight)
    			submenu.style.height = newHeight + "px";
    		else {
    			clearInterval(intId);
    			submenu.style.height = "";
    			submenu.className = "collapsed";
    			mainInstance.memorize();
    		}
    	}, 30);
    };
    SDMenu.prototype.collapseOthers = function(submenu) {
    	if (this.oneSmOnly) {
    		for (var i = 0; i < this.submenus.length; i++)
    			if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
    				this.collapseMenu(this.submenus[i]);
    	}
    };
    SDMenu.prototype.expandAll = function() {
    	var oldOneSmOnly = this.oneSmOnly;
    	this.oneSmOnly = false;
    	for (var i = 0; i < this.submenus.length; i++)
    		if (this.submenus[i].className == "collapsed")
    			this.expandMenu(this.submenus[i]);
    	this.oneSmOnly = oldOneSmOnly;
    };
    SDMenu.prototype.collapseAll = function() {
    	for (var i = 0; i < this.submenus.length; i++)
    		if (this.submenus[i].className != "collapsed")
    			this.collapseMenu(this.submenus[i]);
    };
    SDMenu.prototype.memorize = function() {
    	if (this.remember) {
    		var states = new Array();
    		for (var i = 0; i < this.submenus.length; i++)
    			states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
    		var d = new Date();
    		d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
    		document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
    	}
    };
    

     

    2010年8月30日 9:29

答案

  • 你好:

    你需要在初始化时给每个要菜单绑定点击事件时多添加一个其它要菜单收起的事件。从代码上看应该是collapseOthers 函数。你可以尝试在初始化函数中添加该函数在要菜单绑定的点击事件里。

     for (var i = 0; i < this.submenus.length; i++)
    this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
    mainInstance.toggleMenu(this.parentNode);

    //mainInstance.collapseOthers();  //test here
      };

    希望可以帮到你。

    2010年8月31日 2:54
    版主