在上一个问题中,我询问了有关更新菜单栏的问题。 BalusC告诉我,我需要添加包含菜单栏的表单。
我想扩展这个问题,询问我是否可以更新标题中的文字。 正在使用模板,我使用填写值
<ui:define name="AreaTitle"> #{viewBacking.current.firstName} #{viewBacking.current.surName} </ui:define>模板有
<h:head> <title><ui:insert name="AreaTitle">Master template</ui:insert></title> <link href="style.css" rel="stylesheet" type="text/css" media="screen" /> </h:head>在标题中定义表单似乎很奇怪,因此没有定义。 我在viewBacking.current中设置了一个断点,所以我可以看到它何时使用它。 即使我点击刷新以重新显示表单,它也不会再次达到断点。 只有当我转到具有不同内容的不同页面时,它才会再次达到断点。 刷新是
public void refreshForm() { RequestContext context = RequestContext.getCurrentInstance(); context.update("menuForm:masterMenuBar"); context.update("AreaTitle"); }这显示了BalusC在masterMenuBar上给我的先前解决方案。 很可能我不能做我要求做的事,但我想确认是否是这种情况。
谢谢,伊兰
In a previous question I asked about updating a menu bar. BalusC told me that I need to add the form containing the menu bar.
I would like to extend that question to ask if I can update the text in the title. A template is being used and I fill in the value using
<ui:define name="AreaTitle"> #{viewBacking.current.firstName} #{viewBacking.current.surName} </ui:define>The template has
<h:head> <title><ui:insert name="AreaTitle">Master template</ui:insert></title> <link href="style.css" rel="stylesheet" type="text/css" media="screen" /> </h:head>It seems strange to define a form in the header so none is defined. I put a break point in the viewBacking.current so I can see when it uses it. Even if I hit the refresh to redisplay the form, it won't hit the break point again. Only when I go to a different page with different content does it hit the break point again. The for the refresh is
public void refreshForm() { RequestContext context = RequestContext.getCurrentInstance(); context.update("menuForm:masterMenuBar"); context.update("AreaTitle"); }This shows the previous solution which BalusC gave me on the masterMenuBar. It could well be that I can't do what I'm asking to do, but I'd like confirmation if that is the case.
Thanks, Ilan
最满意答案
您无法通过JSF ajax更新更新标题,因为<title>不是JSF组件。 你也不能把HTML或JSF组件放在<title> ,这是非法的 HTML语法。
最好的办法是使用JavaScript来更新标题,方法是将其分配给document.title 。 您可以使用RequestContext#execute() 。
String fullName = current.getFirstName() + " " + current.getSurName(); context.execute("document.title='" + fullName + "'");由于这似乎是用户控制的数据,我将使用StringEscapeUtils#escapeJavaScript()来逃避它,以防止潜在的XSS攻击漏洞 。
String fullName = current.getFirstName() + " " + current.getSurName(); context.execute("document.title='" + StringEscapeUtils.escapeJavaScript(fullName) + "'");另一种方法是使用OmniFaces <o:onloadScript> 。
<o:onloadScript>document.title='#{of:escapeJS(viewBacking.current.firstName)} #{of:escapeJS(viewBacking.current.surName)}'</o:onloadScript>这将在每个ajax请求上重新执行。
You can't update the title by JSF ajax update simply because <title> is not a JSF component. You also can't put HTML or JSF components in <title>, this is illegal HTML syntax.
Your best bet is to use JavaScript instead to update the title by assigning it to the document.title. You can use RequestContext#execute() for this.
String fullName = current.getFirstName() + " " + current.getSurName(); context.execute("document.title='" + fullName + "'");Since this seems to be user-controlled data, I would use StringEscapeUtils#escapeJavaScript() to escape it in order to prevent potential XSS attack holes.
String fullName = current.getFirstName() + " " + current.getSurName(); context.execute("document.title='" + StringEscapeUtils.escapeJavaScript(fullName) + "'");An alternative is to use OmniFaces <o:onloadScript>.
<o:onloadScript>document.title='#{of:escapeJS(viewBacking.current.firstName)} #{of:escapeJS(viewBacking.current.surName)}'</o:onloadScript>This will be re-executed on every ajax request.
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