javascript 选择表行时启用 JSF Primefaces 设置按钮
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JSF Primefaces set button enabled when table row is selected
提问by Oleksandr H
I have a list of users in a table and with disabled Delete button. I need to enable the Delete button when I select the row in the table. How can I do this?
我有一个表中的用户列表，并禁用了删除按钮。当我选择表中的行时，我需要启用“删除”按钮。我怎样才能做到这一点？
<p:dataTable value="#{userBean.patients}" var="item"
selectionMode="single" rowKey="#{item.id}"
selection="#{userBean.selected}"
onRowSelected="deleteButton.disabled='false';"> // HOW TO WRITE THIS EVENT CORRECTLY?????
// columns
</p:dataTable>
//This button must be enable after I click on any table row
<p:commandButton id="deleteButton" value="Delete" disabled="true" />
Maybe, I need to use onRowClick event. I dont know the name of this event
也许，我需要使用 onRowClick 事件。我不知道这个活动的名字
回答by Oleksandr H
Thanks for jsfviky71 ! I write:
感谢 jsfviky71 ！我写的：
<h:form id="form">
<p:dataTable value="#{bean.patients}" var="item"
selectionMode="single" rowKey="#{item.id}"
selection="#{bean.selected}" >
<p:ajax event="rowSelect" update=":form:deleteButton" listener="#{bean.onRowSelect}" />
// data in rows
</p:dataTable>
<p:commandButton id="deleteButton" value="Delete" disabled="#{bean.disabled}"/>
And in my bean:
在我的豆子中：
private Boolean disabled = true;
// getter and setter
public void onRowSelect(SelectEvent event) {
disabled = false;
}
Hope this will help to others
希望这会对其他人有所帮助
回答by jsfviky
One solution could be using
一种解决方案可能是使用
<p:ajax event="rowSelect" update=":deleteButton" listener="#{bean.someListener}" />
<p:ajax event="rowSelect" update=":deleteButton" listener="#{bean.someListener}" />
inside datatable.
数据表里面。
This catches the row selection event, calls a listener and updates the button.
这会捕获行选择事件，调用侦听器并更新按钮。
Now you could define the listener in the backing bean that just updates the value of a boolean instance variable, that reflects the disabled/enabled status of the button in the view:
现在，您可以在支持 bean 中定义监听器，该监听器仅更新布尔实例变量的值，反映视图中按钮的禁用/启用状态：
<p:commandButton id="deleteButton" value="Delete" disabled="#{bean.selectedBoolean}" />
<p:commandButton id="deleteButton" value="Delete" disabled="#{bean.selectedBoolean}" />
You can take a look at primefaces showcase for a similar scenario:
您可以查看类似场景的 primefaces 展示：
http://www.primefaces.org/showcase/ui/datatableRowSelectionInstant.jsf
http://www.primefaces.org/showcase/ui/datatableRowSelectionInstant.jsf
Hope this helps.
希望这可以帮助。
