jQuery EasyUI使用教程：加載父/子節(jié)點(diǎn)到樹(shù)中

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通常表示一個(gè)樹(shù)節(jié)點(diǎn)的方式就是在每一個(gè)節(jié)點(diǎn)存儲(chǔ)一個(gè)parentid，這個(gè)也被稱為鄰接列表模型。直接加載這些數(shù)據(jù)到樹(shù)中是不允許的。但是我們可以在加載樹(shù)形菜單之前，把它轉(zhuǎn)換為標(biāo)準(zhǔn)的樹(shù)形數(shù)據(jù)格式。樹(shù)插件提供一個(gè)'loadFilter'選項(xiàng)函數(shù)，它可以實(shí)現(xiàn)這個(gè)功能。它提供一個(gè)機(jī)會(huì)來(lái)改變?nèi)魏我粋€(gè)輸入數(shù)據(jù)。本教程向您展示如何使用'loadFilter'函數(shù)加載父/子節(jié)點(diǎn)到樹(shù)中。

父/子節(jié)點(diǎn)數(shù)據(jù)

[
{"id":1,"parendId":0,"name":"Foods"},
{"id":2,"parentId":1,"name":"Fruits"},
{"id":3,"parentId":1,"name":"Vegetables"},
{"id":4,"parentId":2,"name":"apple"},
{"id":5,"parentId":2,"name":"orange"},
{"id":6,"parentId":3,"name":"tomato"},
{"id":7,"parentId":3,"name":"carrot"},
{"id":8,"parentId":3,"name":"cabbage"},
{"id":9,"parentId":3,"name":"potato"},
{"id":10,"parentId":3,"name":"lettuce"}
]

使用'loadFilter“創(chuàng)建樹(shù)

$('#tt').tree({
url: 'data/tree6_data.json',
loadFilter: function(rows){
return convert(rows);
}
});

執(zhí)行轉(zhuǎn)換

function convert(rows){
function exists(rows, parentId){
for(var i=0; i&ltrows.length; i++){
if (rows[i].id == parentId) return true;
}
return false;
}

var nodes = [];
// get the top level nodes
for(var i=0; i&ltrows.length; i++){
var row = rows[i];
if (!exists(rows, row.parentId)){
nodes.push({
id:row.id,
text:row.name
});
}
}

var toDo = [];
for(var i=0; i&ltnodes.length; i++){
toDo.push(nodes[i]);
}
while(toDo.length){
var node = toDo.shift(); // the parent node
// get the children nodes
for(var i=0; i&ltrows.length; i++){
var row = rows[i];
if (row.parentId == node.id){
var child = {id:row.id,text:row.name};
if (node.children){
node.children.push(child);
} else {
node.children = [child];
}
toDo.push(child);
}
}
}
return nodes;
}

下載EasyUI示例：easyui-tree-demo.zip

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