我之前在 stackoverflow 上创建并提供了这个想法 here。
我知道它可以改进并制作一个更好的版本，但现在你可以使用它并享受它......
它的特点：
»» 支持键盘方向键移动节点（左右）
»» 支持鼠标左右拖动节点
»» 将每个节点的关卡数据保存在DOM中并显示在每个节点上
你可以test it on fiddle
我的代码结果：
JS & jQuery
/*Code by Ram >> https://stackoverflow.com/users/1474613/ram */
(function ($) {
$.Noder = function (oneOfNodes) {
this.element = '';
oneOfNodes=(oneOfNodes instanceof $) ? oneOfNodes : $(oneOfNodes)
this.baseX=oneOfNodes.position().left;
this.currentX=0;
};
$.Noder.prototype = {
InitEvents: function () {
//`this` references the created instance object inside an instace's method,
//however `this` is set to reference a DOM element inside jQuery event handler functions' scope.
//So we take advantage of JS's lexical scope and assign the `this` reference to
//another variable that we can access inside the jQuery handlers
var that = this;
//I'm using `document` instead of `this` so it will catch arrow keys
//on the whole document and not just when the element is focused.
//Also, Firefox doesn't fire the keypress event for non-printable characters
//so we use a keydown handler
$(document).keydown(function (e) {
var key = e.which;
if (key == 39) {
that.moveRight();
} else if (key == 37) {
that.moveLeft();
}
});},
setElement: function(element){
this.element = (element instanceof $) ? element : $(element);
console.log(this.element);
this.currentX=this.element.position().left;
console.log('currentX: '+this.currentX);
this.element.addClass('active');
},
moveRight: function () {
console.log('bseX: '+this.baseX);
console.log('currentX: '+this.currentX);
var max=(25*2)+this.baseX;
console.log('max: '+max);
if(this.currentX<max)
{
this.element.css("left", '+=' + 25);
this.currentX=this.element.position().left;
setElementLevel(this.element,this.currentX,this.baseX);
console.log('currentX: '+this.currentX);
}
},
moveLeft: function () {
if(this.currentX>this.baseX)
{
this.element.css("left", '-=' + 25);
this.currentX=this.element.position().left;
setElementLevel(this.element,this.currentX,this.baseX);
console.log('currentX: '+this.currentX);
}
}
};
$.Noder.defaultOptions = {
currentX: 0
};
}(jQuery));
function setElementLevel(element,currentX,baseX){
var level=0;
if (currentX==baseX+25)
level=1;
else if(currentX==baseX+25+25)
level=2;
element.data('level', level);
setLevelOnElement(element);
}
function getElementLevel(element){
console.log(element.data('level'));
return element.data('level');
}
function setLevelOnElement(element){
var level = 0;
if(typeof getElementLevel(element) !=='undefined')
level = getElementLevel(element);
console.log('my level: '+level);
var $levelElement=element.find( ".node-level" );
if ($levelElement && $levelElement.length>0)
{
$levelElement=$($levelElement[0]);
console.log($levelElement);
$levelElement.html(level);
}
}
var noder = new $.Noder($("#myTree>.node")[0]);
$("#myTree>.node").on('click',function(){
$("#myTree>.node").each(function(){
$(this).removeClass('active')
});
console.log($(this)[0].id +' clicked')
noder.setElement($(this)[0]);
})
noder.InitEvents();
$(document).ready(function() {
var $dragging = null;
var $myTree=$('ul#myTree');
var $oneOfNodes=null;
var baseX=0;
if($myTree.length>0)
{
console.log($myTree);
$oneOfNodes=$($myTree.children()[0]);
console.log($oneOfNodes);
baseX=$oneOfNodes.position().left;
console.log('baseX >> '+baseX);
console.log($myTree);
var x=0;
$('ul#myTree').find('li').each(function(){
x++;
console.log(x);
setLevelOnElement($(this));
});
}
$(document.body).on("mousemove", function(e) {
if ($dragging) {
var currentX=$dragging.position().left;
if(e.pageX>(baseX+25) && e.pageX<(baseX+(2*25)))
{
$dragging.offset({left: (baseX+25)});
setElementLevel($dragging,currentX,baseX);
}
else if((e.pageX)>(baseX+(2*25)) )
{
$dragging.offset({left: (baseX+(2*25))});
setElementLevel($dragging,currentX,baseX);
}
else if(e.pageX<(baseX+25) )
{
$dragging.offset({left: (baseX)});
setElementLevel($dragging,currentX,baseX);
}
}
});
$(document.body).on("mousedown", function (e) {
var $myTree=$('ul#myTree');
if($(e.target) && $myTree && $myTree.length>0)
{
var $li=$(e.target).parent();
var $ul=$(e.target).parent().parent();
if ( $ul.is($myTree) && $(e.target).hasClass("node-level") )
{
$ul.find('li').each(function(){
$(this).removeClass('active');
});
$li.addClass('active');
$dragging = $($li);
}
}
});
$(document.body).on("mouseup", function (e) {
$dragging = null;
});
});
HTML
<ul id="myTree">
<li class="node" id="node1">
<span class="node-level"></span>
<span class="node-content">Node 1</span>
</li>
<li class="node" id="node2">
<span class="node-level"></span>
<span class="node-content">Node 2</span>
</li>
<li class="node" id="node3">
<span class="node-level"></span>
<span class="node-content">Node 3</span>
</li>
<li class="node" id="node4">
<span class="node-level"></span>
<span class="node-content">Node 4</span>
</li>
<li class="node" id="node5">
<span class="node-level"></span>
<span class="node-content">Node 5</span>
</li>
<li class="node" id="node6">
<span class="node-level"></span>
<span class="node-content">Node 6</span>
</li>
<li class="node" id="node7">
<span class="node-level"></span>
<span class="node-content">Node 7</span>
</li>
</ul>
CSS
#myTree{
margin:20px;
padding:0;
list-style-type:none;
font-size:11px;
}
#myTree>li>.node-level{
padding:6px 10px;
color:#ddd;
background:gray;
position:relative;
cursor:move;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
#myTree>li>.node-content{
padding:5px; 15px;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
#myTree>.node:hover {
background:#acd;
color:#004;
}
#myTree>.node.active {
border:1px #a66 solid;
background:#fd8;
color:#004;
}
#myTree>li.node {
width:151px;
background:#ddd;
margin-top:2px;
padding:5px 0px 5px 0;
color:#555;
cursor:pointer;
position:relative;
border:1px solid #ccc;
}
html, body {
height:100%;
}
div { width:151px;
background:#ddd;
margin-top:2px;
padding:5px 15px;
color:#555;
cursor:pointer;
position:relative;
border:1px solid #ccc; }