Wicket：如何在运行时添加链接地址

发布于 2024-09-16 23:22:53 字数 33 浏览 3 评论 0 原文

有人知道如何在 Wicket 中动态添加链接地址吗？

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谁的新欢旧爱 2024-09-23 23:22:53

ExternalLink 采用提供链接 URL 的模型参数。该模型几乎可以是任何东西。这是生成随机链接的一个（LoadableDetachableModel 是动态模型的一种便捷实现）：

IModel<String> model=new LoadableDetachableModel<String>() {
    private static final long   serialVersionUID    = 1L;
    @Override
    protected String load() {
        // this class does not really exist
        return LinkRandomizer.getNewRandomUrl();
    }
};
add(new ExternalLink("link", model));

请参阅：

事实证明，OP 需要一个带有 ExternalLink 的 ListView。

这是一个带有链接列表的面板：

public class FooPanel extends Panel {

    private static final long   serialVersionUID    = 1L;

    public static class LinkBean{
        private String link;
        private String label;
        public LinkBean(final String link, final String label) {
            this.link = link;
            this.label = label;
        }
        public String getLabel() {
            return this.label;
        }
        public String getLink() {
            return this.link;
        }
        public void setLabel(final String label) {
            this.label = label;
        }
        public void setLink(final String link) {
            this.link = link;
        }


    }

    public FooPanel(final String id) {
        super(id);
        this.add(new ListView<LinkBean>("item", 
                Arrays.asList(
                    new LinkBean("http://www.google.com/","Google"), 
                    new LinkBean("http://www.ebay.com/", "Ebay"))
                ) {

            private static final long   serialVersionUID    = 1L;

            @Override
            protected void populateItem(final ListItem<LinkBean> item) {
                item.add(new ExternalLink("link", item.getModelObject().getLink())
                    .add(new Label("label",item.getModelObject().getLabel()))
                );

            }
        });
    }
}

这是关联的 HTML：

<html><head></head><body>
<wicket:panel>
    <div class="linkItem" wicket:id="item">
        <a href="" wicket:id="link" >
            <wicket:container wicket:id="label" />
        </a>
    </div>
</wicket:panel>
</body></html>

输出将如下所示：

<div class="linkItem"><a href="http://www.google.com/">Google</a></div>
<div class="linkItem"><a href="http://www.ebay.com/">Ebay</a></div>

请参阅

ListView 和其他重复器（
古老教程，小心：这个
与旧的非通用相关
1.3.x 中的 ListView 版本）
Wicket 示例：中继器视图
（ListView没有被覆盖，但是
处理方式非常相同）
ListView Api 文档
检票动作（非常好的
关于 Wicket 的书你应该考虑购买）

ExternalLink takes a model parameter that supplies a link URL. That model can be pretty much anything. Here's one that generates random links (LoadableDetachableModel is a convenience implementation of a dynamic model):

IModel<String> model=new LoadableDetachableModel<String>() {
    private static final long   serialVersionUID    = 1L;
    @Override
    protected String load() {
        // this class does not really exist
        return LinkRandomizer.getNewRandomUrl();
    }
};
add(new ExternalLink("link", model));

See:

It turns out the OP needs a ListView with ExternalLinks.

Here is a Panel with a list of links:

public class FooPanel extends Panel {

    private static final long   serialVersionUID    = 1L;

    public static class LinkBean{
        private String link;
        private String label;
        public LinkBean(final String link, final String label) {
            this.link = link;
            this.label = label;
        }
        public String getLabel() {
            return this.label;
        }
        public String getLink() {
            return this.link;
        }
        public void setLabel(final String label) {
            this.label = label;
        }
        public void setLink(final String link) {
            this.link = link;
        }


    }

    public FooPanel(final String id) {
        super(id);
        this.add(new ListView<LinkBean>("item", 
                Arrays.asList(
                    new LinkBean("http://www.google.com/","Google"), 
                    new LinkBean("http://www.ebay.com/", "Ebay"))
                ) {

            private static final long   serialVersionUID    = 1L;

            @Override
            protected void populateItem(final ListItem<LinkBean> item) {
                item.add(new ExternalLink("link", item.getModelObject().getLink())
                    .add(new Label("label",item.getModelObject().getLabel()))
                );

            }
        });
    }
}

And here is the associated HTML:

<html><head></head><body>
<wicket:panel>
    <div class="linkItem" wicket:id="item">
        <a href="" wicket:id="link" >
            <wicket:container wicket:id="label" />
        </a>
    </div>
</wicket:panel>
</body></html>

The Output will be something like this:

<div class="linkItem"><a href="http://www.google.com/">Google</a></div>
<div class="linkItem"><a href="http://www.ebay.com/">Ebay</a></div>

See

ListView and other repeaters (an
ancient tutorial, careful: this
relates to the older non-generic
version of ListView in 1.3.x)
Wicket Examples: Repeater Views
(ListView is not covered, but the
handling is pretty identical)
ListView Api docs
Wicket in Action (A very good
book about Wicket you should consider buying)