Grails hasErrors 方法与三元运算符？
我正在使用 Grails 框架开发应用程序，当从 gsp 视图作为方法调用时，我遇到了 hasErrors 问题。
我有一个由数据库中的值（默认值）填充的表单。这些值存储在会话对象中。用户可以编辑表单字段中的值并将结果发送回数据库。在数据持久化之前，我有一个验证数据的命令对象。如果存在错误，命令对象将以相同的形式呈现视图并突出显示错误。
我想做的是让表单字段由存储在会话对象中的值填充，除非命令对象出现错误。在这种情况下，字段应该由用户输入的错误值填充。
下面是代码片段：
<g:textField name="somename" id="someid" value="${hasErrors(bean: commandobject, field: 'somename') ? fieldValue(bean: commandobject, field: 'somename') : session.somevalue}" />
上面代码的问题是，无论字段中输入的值是正确还是错误，字段始终以会话对象中的值结束。有解决办法吗？还是我一开始就做错了什么？
I'm developing application using Grails framework and I'm having problems with hasErrors when invoked as a method from a gsp view.
I have a form that get's populated by values from a database (default values). Those values are stored in a session object. Users can edit values in form fields and send results back to the database. Before data gets persisted I have a command object that validates data. If there are errors command objects renders view with the same form and errors highlighted.
What I'm trying to do is to have form fields populated by values stored in a session object unless there are errors from command object. In that case field(s) should be populated by the wrong values entered by the user.
Here's the code snippet:
<g:textField name="somename" id="someid" value="${hasErrors(bean: commandobject, field: 'somename') ? fieldValue(bean: commandobject, field: 'somename') : session.somevalue}" />
Problem with above code is that no matter the value entered in the field, whether be right or wrong, field always ends up with the value from the session object. Is there a solution to this or am I doing something wrong in the first place?
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当您像这样调用
hasErrors时，您正在调用 < code>我建议创建您自己的
TagLib并使用commandobject.errors.hasFieldErrors('somename')[docs] 在您的条件中（以获取您正在查找的布尔值 为了）。When you call
hasErrorslike that you're invoking the<g:hasErrors/>tag which doesn't return a boolean value - it looks at the condition and conditionally invokes the tag body. Under that description, it makes sense why it's behaving the way it is.What I'd recommend is to create your own
TagLiband usecommandobject.errors.hasFieldErrors('somename')[docs] in your condition (to get the boolean value you're looking for).hasErrors作为 GSP 中的方法调用与作为标记其中
errors是 CSS 类名称。因此，如果您不指定输出字符串，默认情况下似乎会返回 false，因此要解决您的情况，请返回“1”。因此，您的代码应如下所示：这也适用于
The
hasErrorsas a method call in GSP works a bit differently than as a tag<g:hasErrors>. The former is intended to set CSS class in divs or spans etc...where
errorsis the CSS class name. So if you don't specify the output string, it seems to return false by default, so to workaround your case, return '1'. So your code should look like:This will also work with logical operations in
<g:if>