Cache Editor for DataGrid

This example shows how to cache the editors for datagrid to improve the editing speed.

示例：

代码：

					
<table id="dg" class="easyui-datagrid" title="Cache Editor for DataGrid" style="width:700px;height:auto"
        data-options="
            iconCls: 'icon-edit',
            singleSelect: true,
            toolbar: '#tb',
            url: 'examples/datagrid/datagrid_data1.json',
            method: 'get',
            onClickRow: onClickRow
        ">
    <thead>
        <tr>
            <th data-options="field:'itemid',width:80">Item ID</th>
            <th data-options="field:'productid',width:100,
                    formatter:function(value,row){
                        return row.productname;
                    },
                    editor:{
                        type:'combobox',
                        options:{
                            valueField:'productid',
                            textField:'productname',
                            method:'get',
                            url:'examples/datagrid/products.json',
                            required:true
                        }
                    }">Product</th>
            <th data-options="field:'listprice',width:80,align:'right',editor:{type:'numberbox',options:{precision:1}}">List Price</th>
            <th data-options="field:'unitcost',width:80,align:'right',editor:'numberbox'">Unit Cost</th>
            <th data-options="field:'attr1',width:250,editor:'text'">Attribute</th>
            <th data-options="field:'status',width:60,align:'center',editor:{type:'checkbox',options:{on:'P',off:''}}">Status</th>
        </tr>
    </thead>
</table>

<div id="tb" style="height:auto">
    <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-save',plain:true" onclick="accept()">Accept</a>
    <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-undo',plain:true" onclick="reject()">Reject</a>
    <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-search',plain:true" onclick="getChanges()">GetChanges</a>
</div>
    
<script type="text/javascript">
        (function($){
            function getCacheContainer(t){
                var view = $(t).closest('div.datagrid-view');
                var c = view.children('div.datagrid-editor-cache');
                if (!c.length){
                    c = $('<div class="datagrid-editor-cache" style="position:absolute;display:none"></div>').appendTo(view);
                }
                return c;
            }
            function getCacheEditor(t, field){
                var c = getCacheContainer(t);
                return c.children('div.datagrid-editor-cache-' + field);
            }
            function setCacheEditor(t, field, editor){
                var c = getCacheContainer(t);
                c.children('div.datagrid-editor-cache-' + field).remove();
                var e = $('<div class="datagrid-editor-cache-' + field + '"></div>').appendTo(c);
                e.append(editor);
            }
            
            var editors = $.fn.datagrid.defaults.editors;
            for(var editor in editors){
                var opts = editors[editor];
                (function(){
                    var init = opts.init;
                    opts.init = function(container, options){
                        var field = $(container).closest('td[field]').attr('field');
                        var ed = getCacheEditor(container, field);
                        if (ed.length){
                            ed.appendTo(container);
                            return ed.find('.datagrid-editable-input');
                        } else {
                            return init(container, options);
                        }
                    }
                })();
                (function(){
                    var destroy = opts.destroy;
                    opts.destroy = function(target){
                        if ($(target).hasClass('datagrid-editable-input')){
                            var field = $(target).closest('td[field]').attr('field');
                            setCacheEditor(target, field, $(target).parent().children());
                        } else if (destroy){
                            destroy(target);
                        }
                    }
                })();
            }
        })(jQuery);
</script>
<script type="text/javascript">
        var editIndex = undefined;
        function endEditing(){
            if (editIndex == undefined){return true}
            if ($('#dg').datagrid('validateRow', editIndex)){
                var ed = $('#dg').datagrid('getEditor', {index:editIndex,field:'productid'});
                var productname = $(ed.target).combobox('getText');
                $('#dg').datagrid('getRows')[editIndex]['productname'] = productname;
                $('#dg').datagrid('endEdit', editIndex);
                editIndex = undefined;
                return true;
            } else {
                return false;
            }
        }
        function onClickRow(index){
            if (editIndex != index){
                if (endEditing()){
                    $('#dg').datagrid('selectRow', index)
                            .datagrid('beginEdit', index);
                    editIndex = index;
                } else {
                    $('#dg').datagrid('selectRow', editIndex);
                }
            }
        }
        function accept(){
            if (endEditing()){
                $('#dg').datagrid('acceptChanges');
            }
        }
        function reject(){
            $('#dg').datagrid('rejectChanges');
            editIndex = undefined;
        }
        function getChanges(){
            var rows = $('#dg').datagrid('getChanges');
            alert(rows.length+' rows are changed!');
        }
</script>