/*
 * 分页模型
 */
import { HttpModule, Http, Response, RequestOptions, Headers } from '@angular/http';
export class PageModel{
    constructor(
        public http:Http,   //Http对象
        public url:string,  //数据请求地址
        public limit:number //每次数据限制量
    ){
        this.http=http;
        this.url=url;
        this.limit=limit;
    }
    datas=[];
    total=0;
    offset=0;
    page=0;
    pagenow=0;
    getData(callback:Function){
        this.http.post(this.url,{offset:this.offset,limit:this.limit}).subscribe((res:Response)=>{
            let json=res.json();
            this.total=json.total;
            this.offset+=json.rows.length;
            this.datas=json.rows;
            this.page= Math.ceil(this.total/this.limit);
            this.pagenow=Math.ceil(this.offset/this.limit);
            callback({page:this.page,pagenow:this.pagenow,datas:this.datas});
        },(error:Response)=>{alert("请求失败");});
    }
    public getNext(callback:Function){
        if(this.pagenow>=this.page)return;
        this.getData(callback);
    }
}