1.随便聊聊
这段时间由于工作上的业务需求,对jquery easyui比较感兴趣,根据比较浅薄的js知识,对jquery easyui中的datagrid的源码进行解读,想从中扩展一些实用方法出来.初次打开源码拜读时,呜呼呀,(用东北话说就是,哎呀妈呀),介些都是啥子玩意啊?原来,我从晚上下载的是min版的,众所周知,min版即为压缩版那啊,不过我先前以为只是将空格和回车删除掉了.出乎意料的是并非如此,各位请看:
function _195(_196, _197) {
var opts = $.data(_196, "progressbar").options;
var bar = $.data(_196, "progressbar").bar;
if (_197) {
opts.width = _197;
}
bar._outerWidth(opts.width)._outerHeight(opts.height);
bar.find("div.progressbar-text").width(bar.width());
bar.find("div.progressbar-text,div.progressbar-value").css({height: bar.height() + "px", lineHeight: bar.height() + "px"});
};
以上是我摘自1.8.0版本中的一段代码.可以看出,排版后仍然无法很轻易地阅读.在此插一句,如果各位谁有非min版本,请告之在下,在此感谢!
2.知识梳理
不过,在此也要告诉大家一个好小心,在本人的悉心研究下,已经有了重大突破!(怎么像发布会,抱歉抱歉),现在就将实践经验和代码呈上,请各位赐教!我所做的扩展是对单元格的操作,目前仅仅扩展了两个方法:beginEditCell和endEditCell,参照beginEdit和endEdit两个方法而来,有所改动还需完善.后者两个方法可以参照API,分别表示开始编辑一行和结束编辑一行,很显然这是针对可编辑的datagrid而言的.
扩展jquery有一个基本的框架,在这个框架之内是很普通写js代码是一样的的.下面看这个框架:
(function ($) {
$.extend($.fn.datagrid.methods, {
beginEditCell: function (target, options) {
return target.each(function () {
beginEditCell(this, options);
});
},
endEditCell: function (target, options) {
return target.each(function () {
endEditCell(this, options);
});
}
});
})(jQuery);
其中,代码中的beginEditCell和endEditCell就是我写的扩展方法,前者是开始编辑单元格,后者是结束编辑单元格. 下面简单介绍一下,juqery使用的引擎是sizzle,sizzle可以为你提供多元素操作,这也就是我提供的基本框架中有each的缘故了,并且还有将该元素返回,以便实现级联处理的效果.下面就把完整的代码展示出来,不做过多的解释,因为其中比较复杂,一一注释比较繁琐,不过有时间我会加上的.
(function ($) {
//开启编辑单元格状态
function beginEditCell(target, options) {
var opts = $.data(target, "datagrid").options;
var tr = opts.finder.getTr(target, options.index);
var row = opts.finder.getRow(target, options.index);
// //暂时还不知道该代码的含义,忽略使用
// if (tr.hasClass("datagrid-row-editing")) {
// return;
// }
// tr.addClass("datagrid-row-editing");
_initCellEditor(target, options.index, options.field);
_outerWidthOfEditable(target);
//$.validateRow(target, options.index);暂时先不使用,不知道该方法作用
}
function _initCellEditor(target, _index, _field) {
var opts = $.data(target, "datagrid").options;
var tr = opts.finder.getTr(target, _index);
var row = opts.finder.getRow(target, _index);
tr.children("td").each(function () {
var cell = $(this).find("div.datagrid-cell");
var field = $(this).attr("field");
if (field == _field) {//找到与传递参数相同field的单元格
var col = $(target).datagrid("getColumnOption", field);
if (col && col.editor) {
var editorType, editorOp;
if (typeof col.editor == "string") {
editorType = col.editor;
} else {
editorType = col.editor.type;
editorOp = col.editor.options;
}
var editor = opts.editors[editorType];
if (editor) {
var html = cell.html();
var outerWidth = cell._outerWidth();
cell.addClass("datagrid-editable");
cell._outerWidth(outerWidth);
cell.html("<table border=\"0\" cellspacing=\"0\" cellpadding=\"1\"><tr><td></td></tr></table>");
cell.children("table").bind(
"click dblclick contextmenu",
function (e) {
e.stopPropagation();
});
$.data(cell[0], "datagrid.editor", {
actions: editor,
target: editor.init(cell.find("td"),
editorOp),
field: field,
type: editorType,
oldHtml: html
});
}
}
tr.find("div.datagrid-editable").each(function () {
var field = $(this).parent().attr("field");
var ed = $.data(this, "datagrid.editor");
ed.actions.setValue(ed.target, row[field]);
});
}
});
}
//为可编辑的单元格设置外边框
//来自jquery.easyui.1.8.0.js的 function _4d8()方法
function _outerWidthOfEditable(target) {
var dc = $.data(target, "datagrid").dc;
dc.view.find("div.datagrid-editable").each(function () {
var _this = $(this);
var field = _this.parent().attr("field");
var col = $(target).datagrid("getColumnOption", field);
_this._outerWidth(col.width);
var ed = $.data(this, "datagrid.editor");
if (ed.actions.resize) {
ed.actions.resize(ed.target, _this.width());
}
});
}
//关闭编辑单元格状态
function endEditCell(target, options) {
var opts = $.data(target, "datagrid").options;
var updatedRows = $.data(target, "datagrid").updatedRows;
var insertedRows = $.data(target, "datagrid").insertedRows;
var tr = opts.finder.getTr(target, options.index);
var row = opts.finder.getRow(target, options.index);
// //与beginEditCell相呼应,暂时取消
// if (!tr.hasClass("datagrid-row-editing")) {//行不能编辑时,返回
// return;
// }
// tr.removeClass("datagrid-row-editing");
var _535 = false;
var _536 = {};
tr.find("div.datagrid-editable").each(function () {
var _537 = $(this).parent().attr("field");
var ed = $.data(this, "datagrid.editor");
var _538 = ed.actions.getValue(ed.target);
if (row[_537] != _538) {
row[_537] = _538;
_535 = true;
_536[_537] = _538;
}
});
if (_535) {
if (_45f(insertedRows, row) == -1) {
if (_45f(insertedRows, row) == -1) {
updatedRows.push(row);
}
}
}
_destroyCellEditor(target, options);
$(target).datagrid("refreshRow", options.index);
opts.onAfterEdit.call(target, options.index, row, _536);
}
function _45f(a, o) {
for (var i = 0, len = a.length; i < len; i++) {
if (a[i] == o) {
return i;
}
}
return -1;
}
//销毁单元格编辑器
function _destroyCellEditor(target, options) {
var opts = $.data(target, "datagrid").options;
var tr = opts.finder.getTr(target, options.index);
tr.children("td").each(function () {
var field = $(this).attr("field");
if (field == options.field) {//找到与传递参数相同field的单元格
var cell = $(this).find("div.datagrid-editable");
if (cell.length) {
var ed = $.data(cell[0], "datagrid.editor");
if (ed.actions.destroy) {
ed.actions.destroy(ed.target);
}
cell.html(ed.oldHtml);
$.removeData(cell[0], "datagrid.editor");
cell.removeClass("datagrid-editable");
cell.css("width", "");
}
}
});
}
$.extend($.fn.datagrid.methods, {
beginEditCell: function (target, options) {
return target.each(function () {
beginEditCell(this, options);
});
},
endEditCell: function (target, options) {
return target.each(function () {
endEditCell(this, options);
});
}
});
})(jQuery);
测试页面也展示出来,方便大家使用,不过需要加上必需的jquery easyui代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Row Editing DataGrid - jQuery EasyUI Demo</title>
<link rel="stylesheet" type="text/css" href="../../themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="../../themes/icon.css">
<link rel="stylesheet" type="text/css" href="../demo.css">
<script type="text/javascript" src="../../jquery-1.8.0.js"></script>
<script type="text/javascript" src="../../jquery.easyui.min.js"></script>
<script type="text/javascript" src="../../plugins/jquery.datagrid.cellextend.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#dg").datagrid({
rownumbers:true,
iconCls: 'icon-edit',
singleSelect: true,
toolbar: '#tb',
url: '../datagrid/datagrid_data1.json',
onDblClickCell: onClickRow,
onAfterEdit:onAfterEdit,
striped:true,
columns:[[
{field: 'itemid', title: 'Item ID', width: 80, fitColumns: true},
{field: 'productid', title: 'Product', width: 100,
formatter: function (value, row) {
return row.productname;
},
editor: {
type: 'combobox',
options: {
valueField: 'productid',
textField: 'productname',
url: '../datagrid/products.json',
required: true
}
}},
{field: 'listprice', title: 'List Price', width: 80, align: 'right', editor: {type: 'numberbox', options: {precision: 1}}},
{field: 'unitcost', title: 'Unit Cost', width: 80, align: 'right', editor: 'numberbox'},
{field: 'attr1', title: 'Attribute', width: 250, editor: 'text'},
{field: 'status', title: 'Status', width: 60, align: 'center', editor: {type: 'checkbox', options: {on: 'P', off: ''}}},
{field: 'link', title: 'Link', width: 60, align: 'center',
formatter: function (value, rowData, rowIndex) {
return "<a href='" + value.href + "' onclick='test(" + rowIndex + ");return false;'>" + value.text + "</a>"
}
},
{field: 'isFamle', title: 'IsFamle', width: 60, align: 'center',
formatter: function (value, rowData, rowIndex) {
var str = value=="true" ? "checked" : "";
return "<input type='checkbox' " + str + ">";
//return "<a href='" + value.href + "' onclick='test(" + rowIndex + ");return false;'>" + value.text + "</a>"
}
}
]]
});
});
function test(obj){
alert(obj);
}
</script>
</head>
<body>
<h2>Row Editing DataGrid</h2>
<div class="demo-info">
<div class="demo-tip icon-tip"></div>
<div>Click the row to start editing.</div>
<a href="#">asdf</a>
</div>
<div style="margin:10px 0;"></div>
<table id="dg" class="easyui-datagrid" title="Row Editing DataGrid" style="width:800px;height:auto">
<thead>
<tr>
</tr>
</thead>
</table>
<script type="text/javascript">
var _rowIndex = undefined;
var _field = undefined;
function endEditing() {
if (_rowIndex == undefined || _field == undefined) {
return true;
}
$('#dg').datagrid('endEditCell', {index: _rowIndex, field: _field});
_rowIndex = undefined;
_field = undefined;
return true;
}
function onClickRow(rowIndex, field, value) {
//$('#dg').datagrid('beginEdit', rowIndex);
//$('#dg').datagrid('getEditors', rowIndex);
if (_rowIndex != rowIndex || _field != field) {
if (endEditing()){
$('#dg').datagrid('beginEditCell', {index: rowIndex, field: field});
_rowIndex = rowIndex;
_field = field;
}
}
var data = $('#dg').datagrid('getSelected');
// alert(data.link.href);
}
function onAfterEdit(rowIndex, rowData, changes){
if(changes.status=="P"){
rowData["attr1"]="12312312";
$('#dg').datagrid('updateRow',{
index: rowIndex,
row: rowData
});
$('#dg').datagrid('acceptChanges');
var data = $('#dg').datagrid('getSelected');
alert(data.status);
}else if(changes.status==""){
rowData["attr1"]="12312312";
$('#dg').datagrid('updateRow',{
index: rowIndex,
row: rowData
});
$('#dg').datagrid('acceptChanges');
var data = $('#dg').datagrid('getSelected');
alert(data.status);
alert(data.attr1);
}
}
</script>
</body>
</html>
感谢大家阅读,请多指教!谢谢