最近客串了一把前端,有行復(fù)制的功能用 jQuery 來實(shí)現(xiàn)了。感覺比以前原生js用 CreateElement 要簡單多了,但還是遇到了一些陷阱比如IE7的bug,這里記錄下來。先看看 table 的樣子:這里3行是一組,按下"Copy"連值復(fù)制,按下"Add"只增加行不復(fù)制值。calendar 使用的是 jQuery UI 里的 datepicker?
下圖只是一個(gè)簡單的demo,沒有復(fù)雜的樣式表:
為了靈活對應(yīng)不同的表格,提取了一個(gè)共通的 js 來處理,作為使用前提:
1. table 必須有 id;
2. 有 id 的 tr 才會(huì)被復(fù)制;(tr的id從1開始編號)
3. table 內(nèi)所有id都必須以 xxx_n 編號
function RowCopyUtility(opts) { // 表格Id this.tableId = opts.tableId; // 分組內(nèi)有多少行 this.rowGroupNumber = opts.rowGroupNumber; // 一組內(nèi)Button對應(yīng)的方法Map(key=Button value, value=對應(yīng)方法名) // 所有方法都應(yīng)以 function (idx) 方式調(diào)用 this.buttonHandlers = opts.buttonHandlers; this._countForRowsGroup = -1; this._keyForRow = -1; this.getTargetRowGroup = function(groupIdx) { var rows = []; if (groupIdx > 0) { for(var i=1; i<this.rowGroupNumber+1; i++) { rows[i-1] = $("#row" + i + "_" + groupIdx); } } else { for(var i=0; i<this.rowGroupNumber; i++) { rows[i] = $("#" + this.tableId + " tr[id]").eq(i); } } return rows; }; this.addRow = function (groupIdx, needCopyValue) { if (this._countForRowsGroup == -1) { this._countForRowsGroup = ($("#" + this.tableId + " tr[id]").length - 1)/this.rowGroupNumber; this._keyForRow = parseInt($("#" + this.tableId + " tr[id]:not(#row_add):last").attr("id").split("_")[1]) + 1; } if (groupIdx == 0) { var firstRow = $("#" + this.tableId + " tr[id]:first"); var currentIdx = firstRow.attr("id").split("_")[1]; groupIdx = currentIdx; } var regForId = new RegExp("^(\\w+_)" + groupIdx + "$"); var regForName = new RegExp("^(\\w+_)" + groupIdx + "$"); var regForRadioId = new RegExp("^(\\w+_)" + groupIdx + "(.*)$"); var targetRows = this.getTargetRowGroup(groupIdx); // 重要:注意閉包參數(shù)的作用域 var idx = this._keyForRow; for(var i=0; i<targetRows.length; i++) { // clone target rows var cloneRow = targetRows[i].clone(false); var newRowId = cloneRow.attr("id").split("_")[0] + "_" + idx; cloneRow.attr("id", newRowId); var radios = []; cloneRow.find("[id]").each(function() { var id = $(this).attr("id"); var oldId = id; var name = $(this).attr("name"); id = id.replace(regForId, "$1" + idx); $(this).attr("id", id); var newname = name.replace(regForName, "$1" + idx); $(this).attr("name", newname); if ($(this).hasClass("hasDatepicker")) { $(this).removeClass("hasDatepicker"); } if ($(this).attr("type") == "checkbox") { if($(this).next().attr("for") != "") { $(this).next().attr("for", id); } if (!needCopyValue) { $(this).attr("checked", ""); } } else if ($(this).attr("type") == "radio") { id = id.replace(regForRadioId, "$1" + idx); $(this).attr("id", id); var radio = new Object(); radio.id = id; radio.oldId = oldId; radio.name = name; radio.newname = newname; // IE7's Bug radio.checked = document.getElementById(oldId).checked; radios[radios.length] = radio; if($(this).next().attr("for") != "") { $(this).next().attr("for", id); } if (!needCopyValue) { $(this).attr("checked", ""); } } else if ($(this).attr("tagName") == "SELECT") { if (needCopyValue) { $(this).val(document.getElementById(oldId).value); } } else if ($(this).attr("tagName") == "TEXTAREA" || $(this).attr("type") == "text" || $(this).attr("type") == "hidden") { if (!needCopyValue) { $(this).val(""); } } }); // insert into document cloneRow.insertBefore("#" + this.tableId + " tr:last"); // replace name for radio for(var n=0; n<radios.length; n++) { document.getElementById(radios[n].id).outerHTML = document.getElementById(radios[n].id).outerHTML.replace(radios[n].name, radios[n].newname); // IE7's Bug document.getElementById(radios[n].oldId).checked = radios[n].checked; } // Event Handler var maps = this.buttonHandlers; cloneRow.find("input:button").each(function() { var value = $(this).attr("value"); var funcName = maps[value]; if (funcName != undefined) { var func = null; func = function() { eval(funcName + "(" + idx + ")"); }; if (func != null) { $(this).attr("onclick", ""); $(this).unbind("click"); $(this).attr("onclick", "").click(func); } } }); } this._countForRowsGroup++; this._keyForRow++; }; this.copyRow = function(groupIdx) { this.addRow(groupIdx, true); }; this.deleteRow = function(groupIdx) { if (this._countForRowsGroup == -1) { this._countForRowsGroup = ($("#" + this.tableId + " tr[id]").length - 1)/this.rowGroupNumber; this._keyForRow = parseInt($("#" + this.tableId + " tr[id]:not(#row_add):last").attr("id").split("_")[1]) + 1; } var allRows = $("#" + this.tableId + " tr[id]"); var miniRowsCount = this.rowGroupNumber + 1; var tbl = $("#" + this.tableId); if (allRows.length == miniRowsCount) { tbl.find("input:text").each(function() { $(this).val(""); }); tbl.find("textarea").each(function() { $(this).val(""); }); tbl.find("input:hidden").each(function() { $(this).val(""); }); tbl.find("input:radio").each(function() { $(this).attr("checked", ""); }); tbl.find("input:checkbox").each(function() { $(this).attr("checked", ""); }); tbl.find("select").each(function() { document.getElementById($(this).attr("id")).selectedIndex = 0; }); tbl.find(".fg-common-field-errored").each(function() { $(this).removeClass("fg-common-field-errored"); }); return; } for(var i=1; i<this.rowGroupNumber+1; i++) { tbl.find("#row" + i + "_" + groupIdx).remove(); } this._countForRowsGroup--; }; }
實(shí)際遇到的問題與解決辦法:
1. jQuery 的 Clone() 方法,就算傳入 false,元素的事件依然會(huì)被復(fù)制過來。(IE測試)
2. attr("name", name); 在IE中,不會(huì)直接替換掉,而是生成 submitName 保存。在 IE7 里 radio 會(huì)因?yàn)?name 相同而出現(xiàn)問題。
3. 在大量的匿名方法中,特別要注意閉包封送參數(shù)的作用域。
4. IE7里的Bug:在radio被復(fù)制時(shí),原來的元素的選擇值就沒了。因此在復(fù)制前保存了復(fù)制源的radio屬性,加入document之后再次設(shè)定:
// replace name for radio for(var n=0; n<radios.length; n++) { document.getElementById(radios[n].id).outerHTML = document.getElementById(radios[n].id).outerHTML.replace(radios[n].name, radios[n].newname); // IE7's Bug document.getElementById(radios[n].oldId).checked = radios[n].checked; }
5. jQuery里清除事件單獨(dú)用 attr("onclick", "") 并不好用;后期用 click(function) 綁定的事件用 unbind("click") 可以移除。
if (func != null) { $(this).attr("onclick", ""); $(this).unbind("click"); $(this).attr("onclick", "").click(func); }
6. jQuery UI 的 DatePicker 當(dāng)創(chuàng)建了 datepicker 之后,可以通過 hasClass("hasDatepick") 判斷是否存在,否則在復(fù)制之后有問題。
(多次復(fù)制之后 datepicker settings 會(huì)莫名其妙丟失)
7. 其他,剩下就是要注意 jQuery 選擇器不要過度使用了,越復(fù)雜的表達(dá)式效率越低。
順便推薦看一下:15個(gè)值得開發(fā)人員關(guān)注的jQuery開發(fā)技巧和心得
還要說下IE9 的 debug 工具真心不錯(cuò),提高不少開發(fā)效率哦一定要利用。
就這些,希望能對大家有幫助。最后附上,測試用的 html:
<html xmlns="http://www.w3.org/1999/xhtml" lang="ja" xml:lang="ja"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Pragma" content="no-cache" /> <meta http-equiv="Cache-Control" content="no-cache" /> <meta http-equiv="Expires" content="0" /> <style> body{font-family:'Open Sans',arial,sans-serif;} tr{height:30px} input.button{width:60px} table.main { border-width: 2px; border-spacing: 1px; border-style: solid; border-color: gray; border-collapse: collapse; background-color: white; } table.main th { border-width: 1px; padding: 5px; border-style: inset; border-color: gray; background-color: #f0f0f0; -moz-border-radius: ; } table.main td { border-width: 1px; padding: 5px; border-style: inset; border-color: gray; background-color: white; -moz-border-radius: ; } </style> <script type="text/javascript" language="JavaScript" src="jquery.js"></script> <script type="text/javascript" language="JavaScript" src="jquery-ui.js"></script> <script type="text/javascript" language="JavaScript" src="rowCopyUtil.js"></script> <link rel="stylesheet" href="jquery-ui.css" type="text/css" media="all" /> <link type="text/css" href="jqueryCalendarStyle.css" rel="stylesheet" /> <script type="text/javascript" > var rowUtil = new RowCopyUtility( { tableId: "tab1", rowGroupNumber: 3, buttonHandlers: {"Copy":"copyRows", "Delete":"deleteRows", "calendar":"showDatepicker", "some button":"someButtonClick"} } ); function showDatepicker(idx) { var textId = "#calendar_" + idx; if (!$(textId).hasClass("hasDatepicker")) { var text = $(textId).datepicker({ showOn : "calendar", dateFormat : "yy/mm/dd" }); } $(textId).datepicker('show'); } function addRows() { rowUtil.addRow(0, false); } function copyRows(idx) { rowUtil.copyRow(idx); } function deleteRows(idx) { rowUtil.deleteRow(idx); } function someButtonClick(idx) { alert(idx); } </script> </head> <body> <table id="tab1" class="main"> <tr> <th>Header1</th> <th>Header2</th> <th>Header3</th> <th>Header4</th> </tr> <tr id="row1_0"> <td rowspan="3" > <input class="button" type="button" value="Copy" onclick="copyRows(0);" /> <input class="button" type="button" value="Delete" onclick="deleteRows(0);" /> </td> <td>text:<input type="text" id="text_0" /></td> <td> <input type="radio" name="radioAB_0" id="radioA_0" value="1" /><label for="radioA_0">Raido_A </label> <input type="radio" name="radioAB_0" id="radioB_0" value="2" /><label for="radioB_0">Radio_B </label> </td> <td> <select id="select_0"> <option value="0">---select---</option> <option value="1">select option1</option> <option value="2">select option2</option> </select> </td> </tr> <tr id="row2_0"> <td> <input type="checkbox" id="checkA_0" /><label for="checkA_0">Check_A </label> <input type="checkbox" id="checkB_0" /><label for="checkB_0">Check_B </label> </td> <td colspan="2"> <input type="text" id="calendar_0" style="width:90px"/><input type="button" value="calendar" onclick="showDatepicker(0);" /> <input type="button" value="some button" onclick="someButtonClick(0);" /> </td> </tr> <tr id="row3_0"> <td colspan="3"> textarea:<textarea id="textarea_0" style="width:100%"></textarea> </td> </tr> <tr id="row_add"> <td colspan="4"> <input class="button" type="button" value="Add" onclick="addRows();" /> </td> </tr> </table> </body> </html>
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