javascript 如何在 Extjs 中使用 if 条件禁用删除按钮
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How to disable the delete button using if condition in Extjs
提问by sample
How to disable the delete button using if condition in Extjs for ex;i want to disable the button if it satifies the given if condition else remain enabled. if(validAction(entityHash.get('entity.xyz'),actionHash.get('action.delete')))
如何使用 Extjs 中的 if 条件禁用删除按钮，如果它满足给定的条件，我想禁用该按钮，否则条件保持启用。if(validAction(entityHash.get('entity.xyz'),actionHash.get('action.delete')))
This is the grid Delete button code.
这是网格删除按钮代码。
Ext.reg("gridheaderbar-inActive", Ad.GridInActiveButton,{
xtype: 'tbspacer', width: 5
});
Ad.GridCampDeleteButton = Ext.extend(Ext.Toolbar.Button, {
//text: 'Delete',
cls: 'ad-img-button',
width:61,
height:40,
iconCls: 'ad-btn-icon',
icon: '/webapp/resources/images/btn_del.png',
handler:function(){
statusChange(this.parentBar.parentGrid, 'Delete')
}
});
回答by b00b0
create actioncolumnand make custom renderer:
创建actioncolumn和制作自定义渲染器：
{
xtype: 'actioncolumn',
width: 38,
renderer: function (val, metadata, record) {
this.items[0].icon = '${CONTEXT_PATH}/images/' + record.get('fileType') + '.png';
this.items[0].disabled = !record.get('isDownloadActionEnable');
this.items[1].disabled = !record.get('isDeleteActionEnable');
metadata.style = 'cursor: pointer;';
return val;
},
items: [
{
icon: '${CONTEXT_PATH}/images/pdf.png', // Use a URL in the icon config
tooltip: 'Download',
handler: function (grid, rowIndex, colIndex) {
//handle
}
},
{
icon: '${CONTEXT_PATH}/images/delete.png', // Use a URL in the icon config
tooltip: 'Delete',
handler: function (grid, rowIndex, colIndex) {
handle
}
}
]
}
in this example You see additionally how to change dynamically icon.
在本例中，您还可以看到如何动态更改图标。
回答by wimvds
One way to solve it is to attach a unique ID to your delete button and bind a listener to the selectionchangeevent of your SelectionModel, whenever the selection changes you can check whatever you want and enable/disable the button as you see fit.
One way to solve it is to attach a unique ID to your delete button and bind a listener to the selectionchangeevent of your SelectionModel, whenever the selection changes you can check whatever you want and enable/disable the button as you see fit.
ie.
IE。
Ad.GridCampDeleteButton = Ext.extend(Ext.Toolbar.Button, {
id: 'btnDelete',
cls: 'ad-img-button',
...
});
and in your selectionmodel do something like this :
并在您的选择模型中执行以下操作：
var sm = new Ext.grid.CheckboxSelectionModel({
...
,listeners: {
'selectionchange' : {
fn: function(sm) {
if (sm.hasSelection()) {
var selected = sm.getSelected();
if (selected.get('field') == value) {
Ext.getCmp('btnDelete').disable();
}
else {
Ext.getCmp('btnDelete').enable();
}
}
}
,scope: this
}
}
});
