項(xiàng)目中經(jīng)常會遇到樹形數(shù)據(jù)的展現(xiàn)，包括導(dǎo)航，選擇等功能，所以樹控件在大多項(xiàng)目中都是必須的。那一個實(shí)用的樹應(yīng)該具備什么功能呢？

　　根據(jù)我的項(xiàng)目實(shí)踐情況，主要是幾個關(guān)鍵點(diǎn)：

　　1：支持靜態(tài)的樹，即一次性將全部數(shù)據(jù)加載到客戶端。

　　2：異步樹，即一次只加載一級或若干級節(jié)點(diǎn)，子節(jié)點(diǎn)可以異步加載數(shù)據(jù)。

　　3：Checkbox樹（可能是靜態(tài)樹也可能是異步樹），用于選擇（如選擇組織機(jī)構(gòu)，選擇數(shù)據(jù)字典項(xiàng)）等，最好是能夠支持節(jié)點(diǎn)級聯(lián)（這個是難點(diǎn)）

　　4：能夠承載大數(shù)據(jù)量，并性能表現(xiàn)優(yōu)異

　　5：能夠在主流瀏覽器中運(yùn)行良好

　　那我要打造的TreeView就是為了實(shí)現(xiàn)這個5個主要指標(biāo)的。

　　先來看下效果圖

　　上圖是中國行政區(qū)域的數(shù)據(jù)樹，總共得節(jié)點(diǎn)是3500+。

　　那么我們要開工了；

　　1：第一個確定的節(jié)點(diǎn)Dom結(jié)構(gòu)（即用什么樣的HTML來構(gòu)建節(jié)點(diǎn)）　　

• 比較土的是table套table的（樣式上好控制,但是大數(shù)據(jù)量，和層次較深的樹，這種結(jié)構(gòu)肯定頂不住的）
• 還有一種是比較新鮮的UL套LI的方式，這是現(xiàn)下很多書采取的方式如Jquery.treeview就是采用的這種格式，好處比較明顯就是結(jié)構(gòu)簡潔明了，
  而且在不支持Js的瀏覽器上，同樣也能呈現(xiàn)出樹的形狀（這種情況其實(shí)咱可以忽略），但是Jquery.treeview的節(jié)點(diǎn)在IE下，特別是IE6下無法被內(nèi)部元素?fù)伍_，（IE7，8當(dāng)達(dá)到一定深度時無法撐開），請奇怪的現(xiàn)象（我猜測是因?yàn)槭褂胮adding來做縮進(jìn)，margin-left：負(fù)值來控制圖標(biāo)位置有關(guān)，但是修改起來難度也較大），在這種情況下書會變形（Jquery.treeview）就有這種問題，只能通過設(shè)置節(jié)點(diǎn)的width來解決。

　　JQuery.treeview的節(jié)點(diǎn)結(jié)構(gòu)

　　Jquery.TreeView  IE6 下 展開第三級即出現(xiàn)錯位

IE8下展開到第5級

• 還有一些是div套table的方式，CSDN的導(dǎo)航樹就是這種，是種折中的方法（節(jié)點(diǎn)也不算太復(fù)雜，而且CSS也比較好寫），如下圖所示
  

　　而我采用的也是第二種方式，但是縮進(jìn)采用了填空的方式，即縮進(jìn)的位置用空白的圖片填充來避免Jquery.treeview的問題

　　我的樹節(jié)點(diǎn)結(jié)構(gòu)

　　確定了節(jié)點(diǎn)的HTML我們就可以來寫CSS了。有了效果圖，有個節(jié)點(diǎn)結(jié)構(gòu)接著就編寫CSS了

　　下面是CSS的完整代碼

Code
.ie .bbit-tree .bbit-tree-bwrap{

}
.bbit-tree ul,.bbit-tree li
{
    list-style-type:none;
    margin:0px;
    padding:0px;
}
.bbit-tree-body
{
     font-size:12px;
}
.bbit-tree-icon, .bbit-tree-ec-icon,
 .bbit-tree-node-cb,.bbit-tree-elbow-line, 
.bbit-tree-elbow, .bbit-tree-elbow-end,
 .bbit-tree-elbow-plus, .bbit-tree-elbow-minus, 
.bbit-tree-elbow-end-plus,
 .bbit-tree-elbow-end-minus{
    border: 0 none;
    height: 18px;
    margin: 0;
    padding: 0;
    vertical-align: top;
    width: 16px;
    background-repeat: no-repeat;
}
 .bbit-tree-node-cb
 {
     height:16px;
 }
.bbit-tree-node-collapsed .bbit-tree-node-icon, 
.bbit-tree-node-expanded .bbit-tree-node-icon, 
.bbit-tree-node-leaf .bbit-tree-node-icon{
    border: 0 none;
    height: 18px;
    margin: 0;
    padding: 0;
    vertical-align: top;
    width: 16px;
    background-position:center;
    background-repeat: no-repeat;
}

.ie .bbit-tree-node-indent img, .ie .bbit-tree-node-icon,
 .ie .bbit-tree-ec-icon {
    vertical-align:middle !important;
}

.bbit-tree-noicon .bbit-tree-node-icon{
    width:0; height:0;
}

/* No line styles 沒有線的樣式 */
.bbit-tree-no-lines .bbit-tree-elbow{
    background:transparent;
}

.bbit-tree-no-lines .bbit-tree-elbow-end{
    background:transparent;
}

.bbit-tree-no-lines .bbit-tree-elbow-line{
    background:transparent;
}

/* Arrows Vista系統(tǒng)樹的樣式只有箭頭*/
.bbit-tree-arrows .bbit-tree-elbow{
    background:transparent;
}

.bbit-tree-arrows .bbit-tree-elbow-plus{
    background:transparent no-repeat 0 0;
}

.bbit-tree-arrows .bbit-tree-elbow-minus{
    background:transparent no-repeat -16px 0;
}

.bbit-tree-arrows .bbit-tree-elbow-end{
    background:transparent;
}

.bbit-tree-arrows .bbit-tree-elbow-end-plus{
    background:transparent no-repeat 0 0;
}

.bbit-tree-arrows .bbit-tree-elbow-end-minus{
    background:transparent no-repeat -16px 0;
}

.bbit-tree-arrows .bbit-tree-elbow-line{
    background:transparent;
}

.bbit-tree-arrows .bbit-tree-ec-over .bbit-tree-elbow-plus{
    background-position:-32px 0;
}

.bbit-tree-arrows .bbit-tree-ec-over .bbit-tree-elbow-minus{
    background-position:-48px 0;
}

.bbit-tree-arrows .bbit-tree-ec-over .bbit-tree-elbow-end-plus{
    background-position:-32px 0;
}

.bbit-tree-arrows .bbit-tree-ec-over .bbit-tree-elbow-end-minus{
    background-position:-48px 0;
}

.bbit-tree-elbow-plus, 
.bbit-tree-elbow-minus,
 .bbit-tree-elbow-end-plus, 
.bbit-tree-elbow-end-minus{
    cursor:pointer;
}

.ie ul.bbit-tree-node-ct{
    font-size:0;
    line-height:0;
    zoom:1;
}

.bbit-tree-node{
    white-space: nowrap;
}

.bbit-tree-node-el {
    line-height:18px;
    cursor:default;
   /* cursor:pointer;*/
}

.bbit-tree-node a{
    text-decoration:none;
    -khtml-user-select:none;
    -moz-user-select:none;
    -webkit-user-select:ignore;
    -kthml-user-focus:normal;
    -moz-user-focus:normal;
    -moz-outline: 0 none;
    outline:0 none;
}

.bbit-tree-node a span{
    text-decoration:none;
    padding:1px 3px 1px 2px;
}

.bbit-tree-node .bbit-tree-node-disabled .bbit-tree-node-icon{
   -moz-opacity: 0.5;
   opacity:.5;
   filter: alpha(opacity=50);
}

.bbit-tree-node .bbit-tree-node-inline-icon{
    background:transparent;
}

.bbit-tree-node a:hover{
    text-decoration:none;
}



/* Fix for ie rootVisible:false issue，修正一個IEdebug */
.bbit-tree-root {
    zoom:1;
}


/***********這里是圖標(biāo)了，可以在這里替換哦*****************/
.bbit-tree-node-expanded .bbit-tree-node-icon{
    background-image:url(images/tree/folder-open.gif);
}

.bbit-tree-node-leaf .bbit-tree-node-icon{
    background-image:url(images/tree/leaf.gif);
}

.bbit-tree-node-collapsed .bbit-tree-node-icon{
    background-image:url(images/tree/folder.gif);
}

.bbit-tree-node-loading .bbit-tree-node-icon{
    background-image:url(images/tree/loading.gif) !important;
}

.bbit-tree-node .bbit-tree-node-inline-icon {
    background-image: none;
}

.bbit-tree-node-loading a span{
     font-style: italic;
     color:#444444;
}

.bbit-tree-lines .bbit-tree-elbow{
    background-image:url(images/tree/elbow.gif);
}

.bbit-tree-lines .bbit-tree-elbow-plus{
    background-image:url(images/tree/elbow-plus.gif);
}

.bbit-tree-lines .bbit-tree-elbow-minus{
    background-image:url(images/tree/elbow-minus.gif);
}

.bbit-tree-lines .bbit-tree-elbow-end{
    background-image:url(images/tree/elbow-end.gif);
}

.bbit-tree-lines .bbit-tree-elbow-end-plus{
    background-image:url(images/tree/elbow-end-plus.gif);
}

.bbit-tree-lines .bbit-tree-elbow-end-minus{
    background-image:url(images/tree/elbow-end-minus.gif);
}

.bbit-tree-lines .bbit-tree-elbow-line{
    background-image:url(images/tree/elbow-line.gif);
}

.bbit-tree-no-lines .bbit-tree-elbow-plus{
    background-image:url(images/tree/elbow-plus-nl.gif);
}

.bbit-tree-no-lines .bbit-tree-elbow-minus{
    background-image:url(images/tree/elbow-minus-nl.gif);
}

.bbit-tree-no-lines .bbit-tree-elbow-end-plus{
    background-image:url(images/tree/elbow-end-plus-nl.gif);
}

.bbit-tree-no-lines .bbit-tree-elbow-end-minus{
    background-image:url(images/tree/elbow-end-minus-nl.gif);
}

.bbit-tree-arrows .bbit-tree-elbow-plus{
    background-image:url(images/tree/arrows.gif);
}

.bbit-tree-arrows .bbit-tree-elbow-minus{
    background-image:url(images/tree/arrows.gif);
}

.bbit-tree-arrows .bbit-tree-elbow-end-plus{
    background-image:url(images/tree/arrows.gif);
}

.bbit-tree-arrows .bbit-tree-elbow-end-minus{
    background-image:url(images/tree/arrows.gif);
}

/*TreeNode 選中的Disabled的一些顏色，字體樣式*/
.bbit-tree-node{
    color:#000;
    font: normal 11px arial, tahoma, helvetica, sans-serif;
}

.bbit-tree-node a{
    color:#000;
}
.bbit-tree-node a span{
    color:#000;
}
.bbit-tree-node .bbit-tree-node-disabled a span{
    color:gray !important;
}
.bbit-tree-node .bbit-tree-node-over {
    background-color: #eee;
}

.bbit-tree-node .bbit-tree-selected {
    background-color: #d9e8fb;
}

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