layui table 复选框跳页后再回来保持原来选中的状态

layui table默认跳页后不存在源页面选中的状态。如果要实现记录源页面的选中状态，需要定义一个全局变量来记录数据选中状态。

1、修改table.js

;layui.define(["laytpl", "laypage", "layer", "form"], function (e) {
    "use strict";
    var t = layui.$, i = layui.laytpl, a = layui.laypage, l = layui.layer, n = layui.form, o = layui.hint(),
        r = layui.device(), d = {
        	//layuiPageCheckedIds变量记录选中的数据id，格式是“,1,2,3,4,”的字符串
            config: {checkName: "LAY_CHECKED", indexName: "LAY_TABLE_INDEX", layuiPageCheckedIds: ","},
            cache: {},
            index: layui.table ? layui.table.index + 1e4 : 0,
            set: function (e) {
                var i = this;
                return i.config = t.extend({}, i.config, e), i
            },
            on: function (e, t) {
                return layui.onevent.call(this, s, e, t)
            }
        }
        
        ...
        
        S.prototype.pullData = function (e, i) {
        var a = this, n = a.config, o = n.request, r = n.response, d = function () {
            "object" == typeof n.initSort && a.sort(n.initSort.field, n.initSort.type)
        };
        if (a.startTime = (new Date).getTime(), n.url) {
            var c = {};
            //在发送请求前将选中的数据放入条件中
            if(n.layuiPageCheckedIds != undefined && "" != n.layuiPageCheckedIds){
                n.where.layuiCheckedIds = n.layuiPageCheckedIds;
            }
            if(tableRender){
                var currPageNumber = getPageNumber();
                c[o.pageName] = currPageNumber;
                tableRender = false;
            }else{
                setPageNumberCookie(e);
                c[o.pageName] = e;
            }
            c[o.limitName] = n.limit;
            t.ajax({
                type: n.method || "get",
                url: n.url,
                data: t.extend(c, n.where),
                dataType: "json",
                success: function (t) {
                    if(null != startLoading){
                        layer.close(startLoading);
                        startLoading = null;
                    }
                    return t[r.statusName] != r.statusCode ? (a.renderForm(), a.layMain.html('
+ f + '">' + (t[r.msgName] || "返回的数据状态异常") + "
")) : (a.renderData(t, e, t[r.countName]), d(), n.time = (new Date).getTime() - a.startTime + " ms", i && l.close(i), void("function" == typeof n.done && n.done(t, e, t[r.countName])))
                },
                error: function (e, t) {
                    a.layMain.html('
+ f + '">数据接口请求异常
'), a.renderForm(), i && l.close(i)
                }
            });
        } else if (n.data && n.data.constructor === Array) {
            if(null != startLoading){
                layer.close(startLoading);
                startLoading = null;
            }
            var s = {}, u = e * n.limit - n.limit;
            s[r.dataName] = n.data.concat().splice(u, n.limit), s[r.countName] = n.data.length, a.renderData(s, e, n.data.length), d(), "function" == typeof n.done && n.done(s, e, s[r.countName])
        }
    }
    ...
    //在文件的最后添加设置选中变量的方法
    //设置初始选中值
    ,d.initPageCheckedIds=function(e,i){
        if(i == undefined || i == ""){
            i = "";
        }
        if(i.length > 0 && "," != i.substring(0,1)){
            i = "," + i;
        }
        if(i.length > 0 && "," != i.substring(i.length - 1, i.length)){
            i = i + ",";
        }
        c.config[e].layuiPageCheckedIds = i;
    },
    //获取选中的ids, 参数e表示table的id
    d.getLayuiPageCheckedIds=function (e) {
            return c.config[e].layuiPageCheckedIds;
    },
    //设置选中的ids,e表示table的id,obj表示选中的行数据，v表示记录哪一个参数
    d.setLayuiPageCheckedIds=function (e,obj,v) {
        var a = c.config[e];
        var layuiPageCheckedIds = a.layuiPageCheckedIds;
        //全选按钮
        if(obj.type == "all"){
        	//全选
            if (obj.checked) {
                var checkStatus = d.checkStatus(e);
                var datas = checkStatus.data;
                for(var i = 0; i < datas.length; i++) {
                    layuiPageCheckedIds = d.setPageSelected(layuiPageCheckedIds, datas[i][v]);
                }
            } 
			//取消全选
			else {
                var cache = d.cache;
                var datas = cache[e];
                for(var i = 0; i < datas.length; i++) {
                    layuiPageCheckedIds = d.cancelPageSelected(layuiPageCheckedIds, datas[i][v]);
                }
            }
        }
		//单行选中
		else {
			//选中
            if (obj.checked) {
                layuiPageCheckedIds = d.setPageSelected(layuiPageCheckedIds, obj.data[v]);
            }
			//取消选中
			 else {
                layuiPageCheckedIds = d.cancelPageSelected(layuiPageCheckedIds, obj.data[v]);
            }
        }
        a.layuiPageCheckedIds = layuiPageCheckedIds;
    },
	//添加选中项
	d.setPageSelected=function(layuiPageCheckedIds, seleted){
        if(layuiPageCheckedIds == undefined || layuiPageCheckedIds == ""){
                return  "," + seleted + ",";
            }else{
                return layuiPageCheckedIds + seleted + ",";
            }
    },
	//取消选中项
	d.cancelPageSelected=function (layuiPageCheckedIds, seleted) {
        var match = "," + seleted + ",";
        var pos = layuiPageCheckedIds.indexOf(match);
        if (pos >= 0) {
            return layuiPageCheckedIds.substring(0, pos) + layuiPageCheckedIds.substring(pos + match.length - 1);
        }
    }
});

2、后台根据id设置数据选中状态

 @RequestMapping(value = "/search", method = RequestMethod.GET)
    @ResponseBody
    public Map<String, Object> search(Pageable pageable, @RequestParam List<Long> layuiCheckedIds) {
        Map<String, Object> rst = new HashMap<>(4);
        rst.put("code", 0);
        rst.put("msg", "");

        Page<Person> page = personService.findPage(pageable);
        
        rst.put("count", page.getTotalSize());
        List<Map<String, Object>> datas = new ArrayList<>(8);
        
        for (Person person : page.getContent()) {
            Map<String, Object> view = new HashMap<>(4);
            view.put("id", person.getId());
            view.put("name", person.getName());
 			
 			//如果person.getId()已经被选中，则设置选中状态
            if (!CollectionUtils.isEmpty(layuiCheckedIds) && layuiCheckedIds.contains(person.getId())) {
                view.put("LAY_CHECKED", true);
            }
            ...
            datas.add(view);
        }
        rst.put("data", datas);
        return rst;
    }

3、前端用法

layui.use("table", function(){
	var table = layui.table;

	//设置初始选中项
	var checkedIds = "1,2,3,4";
	table.render({
		elem: '#test',
		url:"./person/search",
		where: {"layuiCheckedIds": checkedIds },
		,cols: [[
			{type:'checkbox', width:'10%'},
			{field:'id', title: 'ID', width:'20%'},
			{field:'name', title: '姓名', width:'15%'}
		]],
		page: true,
		id:'idTest'
	});
	//初始化选中项
	table.initPageCheckedIds('idTest', checkedIds );
    //监听表格复选框选择
    table.on('checkbox(demo)', function(obj){
    	//设置多页面选中效果
    	//第一个参数表示table的id值，第二个参数表示复选框选中的数据，第三个参数表示要解析的是哪一个属性值（这里是将数据模型中的id属性进行解析）。
        table.setLayuiPageCheckedIds('idTest',obj, "id");
		
		//获取所有选中的id值（例如：“,1,2,5,7,3,15,22”）
		//alert(table.getLayuiPageCheckedIds('idTest'));
    });
});