如果托管Bean中的条件为true，则打开一个新窗口 [英] Opening a new window if condition true in managed bean

问题描述

我想实现一种情况，用户输入URL，并且如果在我的托管bean中指定的条件为true，则该URL将在新的网页中打开.

I want to implement a situation where the user enter a URL, and if a specified condition is true in my managed bean this URL will be opened in a new web page.

我发现了这种可能性:

"h:link"标签可用于生成需要与JSF结果"进行交互的链接，但是缺少动作"支持会导致难以生成动态结果.

The "h:link" tag is useful to generate a link which requires to interact with the JSF "outcome" , but lack of "action" support make it hard to generate a dynamic outcome.

"h:commandLink"标记很烂，生成的JavaScript真的很吓人！不建议您使用此标签，除非您有充分的理由支持.但是它支持动作"属性，这是"h:link"所缺少的.

The "h:commandLink" tag is suck, the generated JavaScript is really scary! Not recommend to use this tag, unless you have a solid reason to support. But it supports the "action" attribute, which is what "h:link" lack of.

"h:outputLink"可用于生成不需要与JSF程序本身进行交互的链接. 最后，将"action"属性添加到"h:link"中将是完美的选择.

The "h:outputLink" is useful to generate a link which does not require to interact with the JSF program itself. At last, it will be perfect if the "action" attribute is added into the "h:link".

但是在条件验证后，我找不到从托管Bean启动打开的网页的方法.

But I didn't find a way to launch the open web page from my managed bean after the condition is verified.

我正在使用JSF2.0，Facelets和PrimeFaces 3.4.

I'm using JSF2.0, Facelets and PrimeFaces 3.4.

推荐答案

要使用这些链接组件之一在新窗口中打开目标，您需要指定target="_blank"属性，但这已经在单击链接时会出现一个新窗口，因此它不依赖于响应.响应到达时，您基本上需要在新窗口中打开目标.唯一的方法是将JavaScript window.open() 调用返回给响应在网络浏览器中执行.

To open the target in a new window using one of those link components, you need to specify target="_blank" attribute, but this will already open the target in a new window at the moment you click the link and does thus not depend on the response. You basically need to open the target in a new window at the moment the response has been arrived. The only way is returning a JavaScript window.open() call to the response so that it get executed in the webbrowser.

在标准JSF中，您可以有条件地呈现JavaScript的window.open().

In standard JSF, you could just render JavaScript's window.open() conditionally.

<h:form>
    <h:inputText value="#{bean.url}" />
    <h:commandButton value="submit" action="#{bean.submit}">
        <f:ajax execute="@form" render="@form" />
    </h:commandButton>
    <h:outputScript rendered="#{bean.valid}">window.open('#{bean.url}')</h:outputScript>
</h:form>

使用

private String url;
private boolean valid;

public void submit() {
    valid = validate(url);
}

// ...

---

在PrimeFaces中，您可以使用 RequestContext#execute() 指定需要在响应完成后执行的JavaScript代码.

---

In PrimeFaces, you could use RequestContext#execute() to specify JavaScript code which needs to be executed on complete of the response.

<h:form>
    <p:inputText value="#{bean.url}" />
    <p:commandButton value="submit" action="#{bean.submit}" />
</h:form>

使用

private String url;

public void submit() {
    if (validate(url)) {
        RequestContext.getCurrentInstance().execute("window.open('" + url + "')");
    }
}

// ...

---

无关:与具体问题无关:您引用的担保声明似乎是由对HTTP/HTML基础知识一无所知的人(GET与POST的局限性等等)编写的.请带上一粒盐.

---

Unrelated to the concrete problem: the ranty statements which you cited there are seemingly written by someone who know nothing about HTTP/HTML basics (limitations of GET vs POST and so on). Please take them with a good grain of salt.

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