<script type="text/javascript">

$(document).ready(function() {

    $("#tt").tree({

        url:"JsonString_zTree",

        checkbox:true,

        lines:true,

        dnd:true,

        parentField:"parentid",//必须

        textFiled:"menuName",//必须

        idFiled:"id",//必须

        onCheck:function(node, checked) {

            alert(node.id+" - "+node.text);

        }

    });

});

//easyui实现自定义simpleData加载

$.fn.tree.defaults.loadFilter = function (data, parent) {

    var opt = $(this).data().tree.options;

    var idFiled,

    textFiled,

    parentField;

    if (opt.parentField) {

        idFiled = opt.idFiled || 'id';

        textFiled = opt.textFiled || 'text';

        parentField = opt.parentField;

        var i,

        l,

        treeData = [],

        tmpMap = [];

        for (i = 0, l = data.length; i < l; i++) {

            tmpMap[data[i][idFiled]] = data[i];

        }

        for (i = 0, l = data.length; i < l; i++) {

            if (tmpMap[data[i][parentField]] && data[i][idFiled] != data[i][parentField]) {

                if (!tmpMap[data[i][parentField]]['children'])

                    tmpMap[data[i][parentField]]['children'] = [];

                data[i]['text'] = data[i][textFiled];

                tmpMap[data[i][parentField]]['children'].push(data[i]);

            } else {

                data[i]['text'] = data[i][textFiled];

                treeData.push(data[i]);

            }

        }

        return treeData;

    }

    return data;

};

</script>