最近工作需要在原来静态看板(大屏)页面的基础上,实现数据的动态展示,而且需要定时刷新。
接到任务后就马不停蹄的开始修改页面:
显然这个需求最好的解决方法就是用Ajax对后台数据进行定时请求,在前端页面进行刷新
基本的效果是这个样子的:
对后台数据进行遍历,循环展示在表格上。
老实讲,做个Ajax向后端请求数据确实easy,但是刺激的是没有后台交互的模块给我拿来测试,作为实习生的我又不可能招呼其他人来帮助我完成测试。
所以还是得靠自己。
接下来我只能凭借我做博客系统积攒的一些php经验写出一个后台模块,独立完成测试工作。
代码如下:
<?php
//连基础元数据都是我自己拍脑袋模拟出来的,有点崇拜我寄几了呢!
$json = \'{
"data": [
{
"TOP_LINE": 10000,
"BOTTOM_LINE": 500,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":3000,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "外轮星"
},
{
"TOP_LINE": 30000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 40000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":3000,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "外星轮"
},
{
"TOP_LINE": 50000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 60000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":5121,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "实轴"
},
{
"TOP_LINE": 20000,
"BOTTOM_LINE": 5000,
"NOW_NUMBER":3000,
"THIS_MOUTH_TAKEIN":0,
"THIS_MOUTH_TAKEOUT":0,
"LAST_MOUTH_TAKEIN":0,
"LAST_MOUTH_TAKEOUT":0,
"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
"OWN_ADRESS": "GEM",
"MATERIAL_NAME_": "外星轮"
}
],
"success": true,
"total": 2
}\';
//Ajax传过来的参数,page是页码,listnum是每页展示的数据条数
$page = $_GET[\'page\'];
$listNum = $_GET[\'listNum\'];
//这个函数蛮重要的json_decode();因为实际上$json我们定义的是个String ,这个函数将它转化成json格式的数据
$jsondata=json_decode($json);
//定义头文件,防止乱码
header("Content-Type: text/html; charset=UTF-8");
//print_r($jsondata);
//这样我们就可以拿到我们要的数组了
$arr = $jsondata->data;
//echo $arr;
//下面是为了拆分后台数据所做的努力了:$sign是判断总数据可以分成多少页
$sign = intval(count($arr)/$listNum)+1;
//如果传过来的页码大于总页码,不好意思,智能取模了,这样才能一直循环下去
if ($page >= $sign) {
$page = $page % $sign;
}
//array_slice(array,start,length),php截取数组的方法
$toget = array_slice($arr,$page*$listNum,$listNum);
//返回数据
echo json_encode($toget);
?>
顺便说一下我们老大给我派发任务的时候的一个知识点:
- 我原来的思路是用一次Ajax请求将后台数据全部拿到,然后在前端分页循环展示(这可能是作为前端开发者常有的思维,),这个思路看似没有问题。
- 因为我们的系统是要部署到工业生产现场的,网络延迟和实时数据 是两个不得不考虑的问题,那么这个时候就必须减少每次请求的负载,还要考虑数据的实效性。
- 这样一来显然通过小批量多频次请求数据更靠谱。
- 所以有了现在的解决方案。
为了方便读者理解整个思路,附上Ajax请求部分代码:
window.onload=function(){
var page = 0 ;
var listNum = 6;
console.log(\'000\');
getAjax(page,listNum);
//getAjax(page,listNum);
setInterval(function(){
page++;
//getAjax(page,listNum);
console.log(page);
getAjax(page,listNum);
},3000);
function getAjax(page,listNum){
var args = {"page":page,"listNum":listNum,"time":new Date()};
$.getJSON(\'../json/storage_rawInventeryView.php\',args,function(result){
//console.log(\'123\');
var arr = result;
console.log(arr);//调试数据
//改变颜色专用变量
var markup = true;
var color;
//调整数据的顺序
//循环遍历json,将获取到的数据插入到页面上
$(\'tbody\').empty();
for (var i = 0; i < arr.length ; i++) {
$(\'tbody\').append(\'<tr></tr>\');
markup = !markup;
if(markup){
color = \'#58D5FF\';
}else{
color = \'#fff\';
}
//调整数据的顺序
var turnList = ["RAW_MATERIAL_BATCH_NUMBER_","MATERIAL_NAME_","TOP_LINE","BOTTOM_LINE","NOW_NUMBER","LAST_MOUTH_TAKEOUT","THIS_MOUTH_TAKEIN","THIS_MOUTH_TAKEOUT","LAST_MOUTH_TAKEIN","OWN_ADRESS"];
for(var q = 0;q < turnList.length; q++){
//console.log(turnList[q]);
if(arr[i][turnList[q]]==\'是\'){
var tdHtml = \'<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:#1DFC8A;" class="ng-binding ng-scope">合格</td>\';
}else if(arr[i][turnList[q]]==\'否\'){
var tdHtml = \'<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:#F3423C;" class="ng-binding ng-scope">退货</td>\';
}else{
var tdHtml = \'<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:\'+color+\';" class="ng-binding ng-scope">\'+arr[i][turnList[q]]+\'</td>\';
}
//console.log(tdHtml);
$(\'tbody>tr:eq(\'+i+\')\').append( tdHtml);
}
}
});
}
}