jquery树插件实现

(function($) {
$.fn.swapClass = function(c1, c2) {
return this.removeClass(c1).addClass(c2);
};
$.fn.switchClass = function(c1, c2) {
if (this.hasClass(c1)) {
return this.swapClass(c1, c2);
}
else {
return this.swapClass(c2, c1);
}
};
$.fn.treeview = function(settings) {
var dfop =
{
method: "POST",
datatype: "json",
url: false,
cbiconpath: "../image/icons/",
icons: ["checkbox_0.gif", "checkbox_1.gif", "checkbox_2.gif"],
showcheck: false, //是否显示选择
oncheckboxclick: false, //当checkstate状态变化时所触发的事件，但是不会触发因级联选择而引起的变化
onnodeclick: false,
cascadecheck: true,
data: null,
clicktoggle: true, //点击节点展开和收缩子节点
theme: "bbit-tree-arrows" //bbit-tree-lines ,bbit-tree-no-lines,bbit-tree-arrows
};
$.extend(dfop, settings);
var treenodes = dfop.data;
var me = $(this);
var id = me.attr("id");
if (id == null || id == "") {
id = "bbtree" + new Date().getTime();
me.attr("id", id);
}
var html = [];
buildtree(dfop.data, html);
me.addClass("bbit-tree").html(html.join(""));
InitEvent(me);
html = null;
//预加载图片
if (dfop.showcheck) {
for (var i = 0; i < 3; i++) {
var im = new Image();
im.src = dfop.cbiconpath + dfop.icons[i];
}
}
//region
function buildtree(data, ht) {
ht.push("<div class='bbit-tree-bwrap'>"); // Wrap ;
ht.push("<div class='bbit-tree-body'>"); // body ;
ht.push("<ul class='bbit-tree-root ", dfop.theme, "'>"); //root
var l = data.length;
for (var i = 0; i < l; i++) {
buildnode(data[i], ht, 0, i, i == l - 1);
}
ht.push("</ul>"); // root and;
ht.push("</div>"); // body end;
ht.push("</div>"); // Wrap end;
}
//endregion
function buildnode(nd, ht, deep, path, isend) {
ht.push("<li class='bbit-tree-node'>");
ht.push("<div id='", id, "_", nd.id, "' tpath='", path, "' unselectable='on'");
var cs = [];
cs.push("bbit-tree-node-el");
if (nd.hasChildren) {
cs.push(nd.isexpand ? "bbit-tree-node-expanded" : "bbit-tree-node-collapsed");
}
else {
cs.push("bbit-tree-node-leaf");
}
if (nd.classes) {
cs.push(nd.classes);
}
ht.push(" class='", cs.join(" "), "'>");
//span indent
ht.push("<span class='bbit-tree-node-indent'>");
if (deep == 1) {
ht.push("<img class='bbit-tree-icon' src='../image/s.gif'/>");
}
else if (deep > 1) {
ht.push("<img class='bbit-tree-icon' src='../image/s.gif'/>");
for (var j = 1; j < deep; j++) {
ht.push("<img class='bbit-tree-elbow-line' src='../image/s.gif'/>");
}
}
ht.push("</span>");
//img
cs.length = 0;
if (nd.hasChildren) {
if (nd.isexpand) {
cs.push(isend ? "bbit-tree-elbow-end-minus" : "bbit-tree-elbow-minus");
}
else {
cs.push(isend ? "bbit-tree-elbow-end-plus" : "bbit-tree-elbow-plus");
}
}
else {
cs.push(isend ? "bbit-tree-elbow-end" : "bbit-tree-elbow");
}
ht.push("<img class='bbit-tree-ec-icon ", cs.join(" "), "' src='../image/s.gif'/>");
ht.push("<img class='bbit-tree-node-icon' src='../image/s.gif'/>");
//checkbox
if (dfop.showcheck && nd.showcheck) {
if (nd.checkstate == null || nd.checkstate == undefined) {
nd.checkstate = 0;
}
ht.push("<img  id='", id, "_", nd.id, "_cb' class='bbit-tree-node-cb' src='", dfop.cbiconpath, dfop.icons[nd.checkstate], "'/>");
}
//a
ht.push("<a hideFocus class='bbit-tree-node-anchor' tabIndex=1 href='javascript:void(0);'>");
ht.push("<span unselectable='on'>", nd.text, "</span>");
ht.push("</a>");
ht.push("</div>");
//Child
if (nd.hasChildren) {
if (nd.isexpand) {
ht.push("<ul  class='bbit-tree-node-ct'  style='z-index: 0; position: static; visibility: visible; top: auto; left: auto;'>");
if (nd.ChildNodes) {
var l = nd.ChildNodes.length;
for (var k = 0; k < l; k++) {
nd.ChildNodes[k].parent = nd;
buildnode(nd.ChildNodes[k], ht, deep + 1, path + "." + k, k == l - 1);
}
}
ht.push("</ul>");
}
else {
if(dfop.isSyn){
ht.push("<ul  class='bbit-tree-node-ct'  style='display:none ;z-index: 0; position: static; visibility: visible; top: auto; left: auto;'>");
if (nd.ChildNodes) {
var l = nd.ChildNodes.length;
for (var k = 0; k < l; k++) {
nd.ChildNodes[k].parent = nd;
buildnode(nd.ChildNodes[k], ht, deep + 1, path + "." + k, k == l - 1);
}
}
ht.push("</ul>");
}else{
ht.push("<ul style='display:none;'></ul>");
}
}
}
ht.push("</li>");
nd.render = true;
}
function getItem(path) {
var ap = path.split(".");
var t = treenodes;
for (var i = 0; i < ap.length; i++) {
if (i == 0) {
t = t[ap[i]];
}
else {
t = t.ChildNodes[ap[i]];
}
}
return t;
}
function check(item, state, type) {
var pstate = item.checkstate;
if (type == 1) {
item.checkstate = state;
}
else {// 上溯
var cs = item.ChildNodes;
var l = cs.length;
var ch = true;
for (var i = 0; i < l; i++) {
if ((state == 1 && cs[i].checkstate != 1) || state == 0 && cs[i].checkstate != 0) {
ch = false;
break;
}
}
if (ch) {
item.checkstate = state;
}
else {
item.checkstate = 1;
}
}
//change show
if (item.render && pstate != item.checkstate) {
var et = $("#" + id + "_" + item.id + "_cb");
if (et.length == 1) {
et.attr("src", dfop.cbiconpath + dfop.icons[item.checkstate]);
}
}
}
//遍历子节点
function cascade(fn, item, args) {
if (fn(item, args, 1) != false) {
if (item.ChildNodes != null && item.ChildNodes.length > 0) {
var cs = item.ChildNodes;
for (var i = 0, len = cs.length; i < len; i++) {
cascade(fn, cs[i], args);
}
}
}
}
//冒泡的祖先
function bubble(fn, item, args) {
var p = item.parent;
while (p) {
if (fn(p, args, 0) === false) {
break;
}
p = p.parent;
}
}
function nodeclick(e) {
var path = $(this).attr("tpath");
var et = e.target || e.srcElement;
var item = getItem(path);
//debugger;
if (et.tagName == "IMG") {
// +号需要展开
if ($(et).hasClass("bbit-tree-elbow-plus") || $(et).hasClass("bbit-tree-elbow-end-plus")) {
var ul = $(this).next(); //"bbit-tree-node-ct"
if (ul.hasClass("bbit-tree-node-ct")) {
ul.show();
}
else {
var deep = path.split(".").length;
if (item.complete) {
item.ChildNodes != null && asnybuild(item.ChildNodes, deep, path, ul, item);
}
else {
$(this).addClass("bbit-tree-node-loading");
asnyloadc(ul, item, function(data) {
item.complete = true;
item.ChildNodes = data;
asnybuild(data, deep, path, ul, item);
});
}
}
if ($(et).hasClass("bbit-tree-elbow-plus")) {
$(et).swapClass("bbit-tree-elbow-plus", "bbit-tree-elbow-minus");
}
else {
$(et).swapClass("bbit-tree-elbow-end-plus", "bbit-tree-elbow-end-minus");
}
$(this).swapClass("bbit-tree-node-collapsed", "bbit-tree-node-expanded");
}
else if ($(et).hasClass("bbit-tree-elbow-minus") || $(et).hasClass("bbit-tree-elbow-end-minus")) {  //- 号需要收缩
$(this).next().hide();
if ($(et).hasClass("bbit-tree-elbow-minus")) {
$(et).swapClass("bbit-tree-elbow-minus", "bbit-tree-elbow-plus");
}
else {
$(et).swapClass("bbit-tree-elbow-end-minus", "bbit-tree-elbow-end-plus");
}
$(this).swapClass("bbit-tree-node-expanded", "bbit-tree-node-collapsed");
}
else if ($(et).hasClass("bbit-tree-node-cb")) // 点击了Checkbox
{
var s = item.checkstate != 1 ? 1 : 0;
var r = true;
if (dfop.oncheckboxclick) {
r = dfop.oncheckboxclick.call(et, item, s);
}
if (r != false) {
if (dfop.cascadecheck) {
//遍历
cascade(check, item, s);
//上溯
bubble(check, item, s);
}
else {
check(item, s, 1);
}
}
}
}
else {
if (dfop.citem) {
$("#" + id + "_" + dfop.citem.id).removeClass("bbit-tree-selected");
}
dfop.citem = item;
$(this).addClass("bbit-tree-selected");
if (dfop.onnodeclick) {
dfop.onnodeclick.call(this, item);
}
}
}
function asnybuild(nodes, deep, path, ul, pnode) {
var l = nodes.length;
if (l > 0) {
var ht = [];
for (var i = 0; i < l; i++) {
nodes[i].parent = pnode;
buildnode(nodes[i], ht, deep, path + "." + i, i == l - 1);
}
ul.html(ht.join(""));
ht = null;
InitEvent(ul);
}
ul.addClass("bbit-tree-node-ct").css({ "z-index": 0, position: "static", visibility: "visible", top: "auto", left: "auto", display: "" });
ul.prev().removeClass("bbit-tree-node-loading");
}
function asnyloadc(pul, pnode, callback) {
if (dfop.url) {
var param = builparam(pnode);
$.ajax({
type: dfop.method,
url: dfop.url + "checkstate=" + pnode.checkstate,
data: param,
dataType: dfop.datatype,
success: callback,
error: function(e) {
alert("error occur!");
}
});
}
}
function builparam(node) {
var p = [
{ name: "nodeId", value: encodeURIComponent(node.id) }
,
{ name: "text", value: encodeURIComponent(node.text) }
,
{ name: "value", value: encodeURIComponent(node.value) }
,
{ name: "checkstate", value: node.checkstate}
];
return p;
}
function InitEvent(parent) {
var nodes = $("li.bbit-tree-node>div", parent);
nodes.each(function(e) {
$(this).hover(function() {
$(this).addClass("bbit-tree-node-over");
}, function() {
$(this).removeClass("bbit-tree-node-over");
})
.click(nodeclick)
.find("img.bbit-tree-ec-icon").each(function(e) {
if (!$(this).hasClass("bbit-tree-elbow")) {
$(this).hover(function() {
$(this).parent().addClass("bbit-tree-ec-over");
}, function() {
$(this).parent().removeClass("bbit-tree-ec-over");
});
}
});
});
}
function getck(items, c, fn) {
for (var i = 0, l = items.length; i < l; i++) {
items[i].checkstate == 1 && c.push(fn(items[i]));
if (items[i].ChildNodes != null && items[i].ChildNodes.length > 0) {
getck(items[i].ChildNodes, c, fn);
}
}
}
me[0].t = {
getSelectedNodes: function() {
var s = [];
getck(treenodes, s, function(item) {
return item;
});
return s;
},
getSelectedValues: function() {
var s = [];
getck(treenodes, s, function(item) {
return item.value;
});
return s;
},
getCurrentItem: function() {
return dfop.citem;
}
};
return me;
};
//获取所有选中的节点的Value数组
$.fn.getTSVs = function() {
if (this[0].t) {
return this[0].t.getSelectedValues();
}
return null;
};
//获取所有选中的节点的Item数组
$.fn.getTSNs = function() {
if (this[0].t) {
return this[0].t.getSelectedNodes();
}
return null;
};
$.fn.getTCT = function() {
if (this[0].t) {
return this[0].t.getCurrentItem();
}
return null;
};
})(jQuery);