.net JS模擬Repeater控件的實現代碼

2019-11-20 22:36:08

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功能強大的模板引擎大都需要對模板進行語法解析，會有性能問題。通過把一個大的模板引擎根據不同呈現需求分隔成多個互相獨立模板控件，可以降低處理復雜度提供處理性能,可以根據需求靈活組合這些模板控件得到一個可以定制的模板功能庫。

<!DOCTYPE html> <html> <head> <meta charset="gb2312" /> <title>JavaScript Repeater控件</title> </head> <body> <div   class="70qarhlowxag"   id="crossRate">  <table width="815" class="table-data"> <tr> <th>代碼</th> <th>名稱</th> <th>最新價</th> <th>漲跌額</th> <th>漲跌幅</th> <th>開盤</th> <th>最高</th> <th>最低</th> <th>昨收</th> </tr> </table>  <script type="text/template" id="crossRateHeader"> <table width="815" class="table-data"> <tr> <th>代碼</th> <th>名稱</th> <th>最新價</th> <th>漲跌額</th> <th>漲跌幅</th> <th>開盤</th> <th>最高</th> <th>最低</th> <th>昨收</th> </tr> </script> <script type="text/template" id="crossRateItem"> <tr> <td>{$dataRow[1]}</td> <td>{$dataRow[2]}</td> <td>{$dataRow[5]}</td> <td>{$dataRow[17]}</td> <td>{$dataRow[18]}</td> <td>{$dataRow[4]}</td> <td>{$dataRow[6]}</td> <td>{$dataRow[7]}</td> <td>{$dataRow[3]}</td> </tr> </script> <script type="text/template" id="crossRateFooter"> </table> </script> </div> <script> //View (function(ns){ function init(){ var container = document.getElementById("crossRate"); container.setAttribute("data-headertemplate", document.getElementById("crossRateHeader").text); container.setAttribute("data-itemtemplate", document.getElementById("crossRateItem").text); container.setAttribute("data-footertemplate", document.getElementById("crossRateFooter").text); } function render(dt){ var container = document.getElementById("crossRate"), headerhtml = container.getAttribute("data-headertemplate"), rowhtml = container.getAttribute("data-itemtemplate"), footerhtml = container.getAttribute("data-footertemplate"); var repater = new Repater(headerhtml,rowhtml,footerhtml); var dataRow = []; for(var i=0,n=dt.length; i<n; i++){ dataRow = dt[i].split(","); repater.set("dataRow",dataRow); repater.parse(); } container.innerHTML = repater.toHTML(); } ns.crossRate = { init: init, render: render, fill: function(data){ render(data); } }; ns.crossRate.init(); } (window)); //異步獲取數據渲染數據data var datas = ["USDEUR0,USDEUR,美元歐元,0.7731,0.7732,0.7723,0.7734,0.7717,0,22913,0.0000,0,0,0.7731,0.0000,0,0,-0.0008,-0.10%,0.0000,1,3848,0,-1,1,0.0000,0.0000,2012-05-10 13:49:53,3","USDHKD0,USDHKD,美元港幣,7.7625,7.7633,7.7621,7.7634,7.7617,0,14208,0.0000,0,0,7.7625,0.0000,0,0,-0.0004,-0.01%,0.0000,2,2062,0,-1,0,0.0000,0.0000,2012-05-10 13:49:49,3","USDJPY0,USDJPY,美元日元,79.71,79.73,79.62,79.77,79.57,0,25489,0.00,0,0,79.71,0.00,0,0,-0.09,-0.11%,0.00,1,4307,0,-1,-1,0.00,0.00,2012-05-10 13:50:13,3","USDCHF0,USDCHF,美元瑞郎,0.9285,0.9287,0.9276,0.9289,0.9266,0,29637,0.0000,0,0,0.9285,0.0000,0,0,-0.0009,-0.10%,0.0000,1,4960,0,-1,1,0.0000,0.0000,2012-05-10 13:50:02,3","GBPUSD0,GBPUSD,英鎊美元,1.6134,1.6136,1.6138,1.6144,1.6121,0,20808,0.0000,0,0,1.6134,0.0000,0,0,0.0004,0.02%,0.0000,2,5381,0,-1,0,0.0000,0.0000,2012-05-10 13:50:04,3"]; //填充數據到view crossRate.fill(datas); //Repater模板控件 function Repater(headerhtml,rowhtml,footerhtml) { var _this = this; var n = 0; _this.cache = []; _this.dic = {}; _this.header = headerhtml; _this.row = rowhtml; _this.footer = '</table>'; if (headerhtml) _this.header = headerhtml; if (rowhtml) _this.row = rowhtml; if (footerhtml) _this.footer = footerhtml; _this.set = function(tag, val) { this.dic[tag] = val; }; _this.parse = function(dic) { var row = this.row, dic = dic || this.dic, re = //{/$(/w+)(?:/[(/d+)/])?(?:/|(/w+))?/}/g, html; html = row.replace(re, function(a, b, c, d) { var val; if (typeof dic[b] == "undefined"){ return b; } if (dic[b].constructor == Array) { val = dic[b][c]; } else { val = dic[b]; } if (Repater[d] || window[d]) {//修飾符 val = (Repater[d] || window[d])(val); } return val; }); _this.cache[n++] = html; return html; }; _this.toHTML = function(args) { var cache = _this.cache, result; _this.cache = []; n = 0; result = _this.header + cache.join("") + _this.footer; for (i in args) { if (args.hasOwnProperty(i)) { result = result.replace("{$"+i+"}", args[i]); } } return result; }; } </script> </body> </html>

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