使用Ext的Grid,Form,Dialog来实现分页列表,创建,修改,删除功能(续) javasc

http://hi.baidu.com/%5Follie/blog/item/8ffb66fa96b1b51da9d3116f.html

 

前面已经把列表,分页,删除等部分说完了,这里再把创建和修改说说,基本的功能就差不多了.

创建

在这里,创建和修改者是用Dialog的形式来做的,首先则需要创建相应的DIV:

<!-- add div -->
    <div id="a-addInstance-dlg" style="visibility:hidden;">
        <div class="x-dlg-hd">添加权限</div>
        <div class="x-dlg-bd">
            <div id="a-addInstance-inner" class="x-layout-inactive-content">
                <div id="a-addInstance-form"></div>
            </div>
        </div>       
    </div>

之后就是在这个DIV里创建Form了,直接用Ext的Form组件:

createNewForm : function() {       
                this.name_tf = new Ext.form.TextField({
                    fieldLabel : '名称',
                    name : 'name',
                    allowBlank : false
                });
                this.description_tf = new Ext.form.TextField({
                    fieldLabel : '描述',
                    name : 'description'
                });
                this.addForm = new Ext.form.Form({
                    labelAlign : 'right',
                    url : '/wit/add.shtml'
                });
                this.addForm.column({
                    width : 430,
                    labelWidth : 120,
                    style : 'margin-left : 8px; margin-top : 8px;'
                });
                this.addForm.fieldset(
                    {id : 'desc', legend : '请填写字段值'},
                    Grid.name_tf,
                    Grid.description_tf
                );
                this.addForm.applyIfToFields({ width : 255 });
                this.addForm.render('a-addInstance-form');
                this.addForm.end();
            }

之后别忘了在加载的时候调用这个方法:

this.createNewForm();

Form窗体定义完,现在可以处理前面说的过那个创建按钮的事件了,在这里事件处理的方法名为doAdd:

doAdd : function() {
                if (!Grid.addInstanceDlg) {
                    Grid.addInstanceDlg = Grid.createNewDialog('a-addInstance-dlg');
                    Grid.addInstanceDlg.addButton('重置', Grid.resetForm, Grid.addInstanceDlg);
                    Grid.addInstanceDlg.addButton('保存', Grid.saveNewForm, Grid.addInstanceDlg);
                    var layout = Grid.addInstanceDlg.getLayout();
                    layout.beginUpdate();
                    var t = new Ext.ContentPanel('a-addInstance-inner', {title : 'create account'});
                    layout.add('center', new Ext.ContentPanel('a-addInstance-inner', {title : '添加权限'}));
                    layout.endUpdate();           
                }                   
                Grid.addInstanceDlg.show();           
            }

首先用Grid.createNewDialog创建一个LayoutDialog,之后再把添加里的特有的按钮加上去,然后更新一下Dialog的布局,把它显示出来,这时就可以看到添加的窗体了:

呵,窗体做的很难看,因为只是为了实现功能,没有在这方便下什么功夫.

Grid.createNewDialog用于创建和修改时创建对话框,代码如下:

createNewDialog : function(title) {
                var newDialog = new Ext.LayoutDialog(title, {
                    modal : true,
                    autoTabs : true,
                    proxyDrag : true,
                    resizable : false,
                    width : 480,
                    height : 302,
                    shadow : true,
                    center : {
                        autoScroll : true,
                        tabPosition : 'top',
                        closeOnTab : true,
                        closeOnTab : true,
                        alwaysShowTabs : false
                    }
                });
                newDialog.addKeyListener(27, newDialog.hide, newDialog);
                newDialog.addButton('取消', function() { newDialog.hide(); } );
                return newDialog;           
            }

如 果添加成功,则自动关闭这个Dialog,并重新加载列表,如果添加失败,只是简单的弹出一个对话框,提示失败,其实这里可以做的更人性化一些,可以在服 务器端传回错误的原因,比如某字段有问题,可以红色显示出其输入框等等.这里服务端返回的JSON数据与删除返回的一样.

处理代码如下:

saveNewForm : function() {
                if (Grid.addForm.isValid()) {
                    Grid.addForm.submit({
                        waitMsg : '正在保存数据...',
                        reset : true,
                        failure : function(form, action) {
                            Ext.MessageBox.alert('友情提示', action.result.info);
                        },
                        success : function(form, action) {
                            Grid.addInstanceDlg.hide();
                            Grid.ds.reload();
                        }
                    });
                } else {
                    Ext.MessageBox.alert('错误', '字段填写不正确!');
                    Grid.name_tf.focus();
                }
            }

修改

修改则和创建差不多了,不同的有两点,一是事件是在列表的行上双击,来触发事件,弹出修改对话框,另一个则是需要在显示对话框的同时,把所要修改的记录的数据加载进来.

首先在列表加上事件捕捉:

this.grid.on('rowdblclick', this.onRowDbClick, this);   

下面则是处理这个事件的代码:

onRowDbClick : function(grid, rowIndex, e) {
                var selectId = this.ds.data.items[rowIndex].id;
                var roleData = new Ext.data.Store({
                    proxy : new Ext.data.HttpProxy({url : '/wit/edit.shtml?id=' + selectId}),
                    reader : new Ext.data.JsonReader({}, ['id', 'name', 'description']),
                    remoteSort : false
                });
                roleData.on('load', function() {
                    Grid.updateId = roleData.getAt(0).data['id'];
                    Grid.name_show.setValue(roleData.getAt(0).data['name']);
                    Grid.description_show.setValue(roleData.getAt(0).data['description']);
                    if (!Grid.updateInstanceDlg) {
                        Grid.updateInstanceDlg = Grid.createNewDialog('a-updateInstance-dlg');
                        Grid.updateInstanceDlg.addButton('保存', Grid.saveUpdateForm, Grid.updateInstanceDlg);
                        var layout = Grid.updateInstanceDlg.getLayout();
                        layout.beginUpdate();
                        layout.add('center', new Ext.ContentPanel('a-updateInstance-inner', {title : '修改权限'}));
                        layout.endUpdate();
                    }
                    Grid.updateInstanceDlg.show();
                });
                roleData.load();
            }

这里做了两件事,一个是把欲修改的数据加载到本地, 服务端返回的数据结构为:

([{"id":"12","description":"test role 12","name":"puras 12"}])

一个是将数据置入Form窗体的字段中,并将Dialog显示出来.修改的Form与创建的相似:

createEditForm : function() {
                this.name_show = new Ext.form.TextField({
                    fieldLabel : '名称',
                    name : 'name',
                    allowBlank : false
                });
                this.description_show = new Ext.form.TextField({
                    fieldLabel : '名称',
                    name : 'description'
                });
                this.editForm = new Ext.form.Form({
                    labelAlign : 'right',
                    url : '/wit/edit_ok.shtml'
                });
                this.editForm.column({width : 430, labelWidth : 120, style : 'margin-left : 8px; margin-top : 8px;'});
                this.editForm.fieldset(
                    {legend : '请更新字段值'},
                    Grid.name_show,
                    Grid.description_show
                );
                this.editForm.applyIfToFields({width : 255});
                this.editForm.render('a-updateInstance-form');
                this.editForm.end();
            }

这个Form对应的Div为:

<!-- update div -->
    <div id="a-updateInstance-dlg" style="visibility:hidden;">
        <div class="x-dlg-hd">修改权限</div>
        <div class="x-dlg-bd">
            <div id="a-updateInstance-inner" class="x-layout-inactive-content">
                <div id="a-updateInstance-form"></div>
            </div>
        </div>
    </div>

双击某条记录,则会弹出修改Dialog了,大概的样子如下:

修改的处理事件与添加类似,需要注意的地方就是ID是怎么传过去的:

saveUpdateForm : function() {
                if (Grid.editForm.isValid()) {
                    Grid.editForm.submit({
                        params : { id : Grid.updateId},
                        waitMsg : '正在更新数据...',
                        reset : false,
                        failure : function(form, action) {
                                Ext.MessageBox.alert('友情提示', action.result.info);
                            },
                        success : function(form, action) {
                            Grid.updateInstanceDlg.hide();
                            Grid.ds.reload();
                        }
                    });                   
                } else {
                    Ext.MessageBox.alert('错误', '字段填写不正确!');
                }
            }

到此就Over啦,列表,添,删,改都OK了.在没有做的时候,总是感觉找不到入口点,做完之后才发现,原来自己担心的问题,都不是问题,哈,想想,还是挺简单的.

作者:puras