.net JS模擬Repeater控件的實(shí)現(xiàn)代碼

2019-11-20 22:36:08

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功能強(qiáng)大的模板引擎大都需要對(duì)模板進(jìn)行語(yǔ)法解析，會(huì)有性能問題。通過把一個(gè)大的模板引擎根據(jù)不同呈現(xiàn)需求分隔成多個(gè)互相獨(dú)立模板控件，可以降低處理復(fù)雜度提供處理性能,可以根據(jù)需求靈活組合這些模板控件得到一個(gè)可以定制的模板功能庫(kù)。

<!DOCTYPE html> <html> <head> <meta charset="gb2312" /> <title>JavaScript Repeater控件</title> </head> <body> <div   class="iwvjtn8m0"   id="crossRate">  <table width="815" class="table-data"> <tr> <th>代碼</th> <th>名稱</th> <th>最新價(jià)</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(jià)</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(shù)據(jù)渲染數(shù)據(jù)data var datas = ["USDEUR0,USDEUR,美元?dú)W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(shù)據(jù)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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