ASP 的 ContentPlaceHolder 的 Grails GSP 等价物是什么？
我一直在研究 Grails GSP 中的模板/布局概念。我一直在使用布局/内容块来模仿 ASP 的母版页行为。
例如，我在模板中使用标签
myTemplate.gsp：
<body>
<g:pageProperty name="page.topDiv" />
</body>
myPage.gsp：
<html>
<head>
<meta name="layout" content="myTemplate"></meta>
</head>
<body>
<content tag="topDiv">
My top div
</content>
</body>
</html>
这非常适合将内容“附加”到模板中的某个位置。然而，我确实想要在 ASP.NET 母版页中获得的行为...即提供某些内容的“默认”呈现，并允许可选的覆盖。在 ASP.NET 母版页中，它看起来像这样：
myMaster.master:
<asp:ContentPlaceHolder id="something" runat="server">
<div>Default text/html here</div>
</asp:ContentPlaceHolder>
someOtherPage.aspx：
<asp:Content contentPlaceHolderId="something" runat="server">
Overriden content here!! I don't need to override this though :)
</asp:Content>
我的问题：
我可以在 Grails 的 GSP 中执行相同的默认/覆盖行为吗？
I've been playing around a lot with the templating/layout concepts in Grails GSP. I've ben using layouts/content blocks for imitating ASP's master page behavior.
For example, I am using the tag <g:pageProperty /> in a template to leave a "placeholder" which can be overridden using a <content> tag:
myTemplate.gsp:
<body>
<g:pageProperty name="page.topDiv" />
</body>
myPage.gsp:
<html>
<head>
<meta name="layout" content="myTemplate"></meta>
</head>
<body>
<content tag="topDiv">
My top div
</content>
</body>
</html>
This works great for "appending" content to some spot within a template. However, I really want the behavior I can get in ASP.NET's master pages... which is to provide a "default" rendering of some content, and allow optional overriding. In an ASP.NET Master page, it would look like this:
myMaster.master:
<asp:ContentPlaceHolder id="something" runat="server">
<div>Default text/html here</div>
</asp:ContentPlaceHolder>
someOtherPage.aspx:
<asp:Content contentPlaceHolderId="something" runat="server">
Overriden content here!! I don't need to override this though :)
</asp:Content>
My Question:
Can I do this same default/overriding behavior in Grails' GSP?
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评论（2）
您可以在几天内完成此任务。
g:pageProperty相当于 Sitemeshdecorator:getProperty标记，因此您可以使用default属性来指示要使用的默认文本。例如：但是，我不知道有一种干净的方法来获取 HTML 内容。您可以使用
g:if标记来测试该属性并指定默认行为（如果该属性不存在）：默认内容也可以存在于外部模板 gsp 中。然后，可以使用
render方法在g:pageProperty的默认属性中显示该内容：在本例中，默认内容将位于
_topDiv 中.gsp。There are a few different days you could accomplish this. The
g:pagePropertyis equivalent to the Sitemeshdecorator:getPropertytag, so you can use adefaultattribute to indicate the default text to use. For example:However, I don't know of a clean way to get HTML content in there. You could use a
g:iftag to test for that property and specify default behavior if it doesn't exist:The default content could also live in an external template gsp. The
rendermethod could then be used to display that content in the default attribute ofg:pageProperty:Where in this case, the default content would be located in
_topDiv.gsp.我想你可以尝试一下。
I think you can try instead.