如何创建具有动态属性的复合组件? [英] How to create a composite component with dynamic attributes?

问题描述

我有这个复合组件:

<cc:interface>
    <cc:attribute name="image_1" />
    <cc:attribute name="image_2" />
    <cc:attribute name="image_3" />
</cc:interface>

<cc:implementation>
    <div id="slider-container">
        <div id="slider-small">
            <h:graphicImage library="images" name="#{cc.attrs.image_1}" />
            <h:graphicImage library="images" name="#{cc.attrs.image_2}" />
            <h:graphicImage library="images" name="#{cc.attrs.image_3}" />
        </div>
    </div>
</cc:implementation>

我以这种方式使用它:

<cs:small_slider 
    image_1="about/1.jpg"
    image_2="about/2.jpg"
    image_3="about/3.jpg"
/>

，但仅限于三个属性.如果必须使用相同的复合组件发送三个以上的邮件，该怎么办:

but is limited to three attributes. What should I do if I have to send more than three, using the same composite component, like this:

<cs:small_slider 
    image_1="about/1.jpg"
    image_2="about/2.jpg"
    image_3="about/3.jpg"
    image_4="about/4.jpg"
    image_5="about/5.jpg"
/>

我想这样做以重用该组件，并且我不想创建另一个组件.

I want to do this to reuse the component and I don't want to create another.

更新: 按照@BalusC方法呈现以下HTML:

UPDATE: Follow @BalusC approach renders the follow HTML:

<!-- small slider --> 
<div id="slider-container"> 
    <div id="slider-small">
        <img src="/brainset/javax.faces.resource/1.jpg.xhtml?ln=images" />
        <img src="RES_NOT_FOUND" />
        <img src="RES_NOT_FOUND" /> 
    </div> 
    <div id="frame-slider-small"></div> 
</div><!-- end #slide-container --> 

它没有找到其他图像，只有第一个.我确定这些图像:"about/2.jpg"和"about/3.jpg"存在.

It not found the others images, only the first. I'm sure those images: 'about/2.jpg' and 'about/3.jpg' exist.

推荐答案

这是不可能的，它还违反了

That's not possible and it also violates the DRY principle.

您最好的选择是 从Bean作为List<String>传递，以便您可以使用<ui:repeat>遍历它:

Your best bet is to either pass it as a List<String> from the bean instead so that you can iterate over it using <ui:repeat>:

<cs:small_slider images="#{bean.images}" />

使用

<cc:interface>
    <cc:attribute name="images" type="java.util.List" required="true" />
</cc:interface>

<cc:implementation>
    <div id="slider-container">
        <div id="slider-small">
            <ui:repeat value="#{cc.attrs.images}" var="image">
                <h:graphicImage library="images" name="#{image}" />
            </ui:repeat>
        </div>
    </div>
</cc:implementation>

---

Or 而是将其定义为硬编码的逗号分隔的字符串，并使用JSTL

---

Or define it as a hardcoded comma-separated string instead and use JSTL fn:split() to split them into a String[] which you in turn feed to <ui:repeat>:

<cs:small_slider images="about/1.jpg,about/2.jpg,about/3.jpg" />

使用

<cc:interface>
    <cc:attribute name="images" type="java.lang.String" required="true" />
</cc:interface>

<cc:implementation>
    <div id="slider-container">
        <div id="slider-small">
            <ui:repeat value="#{fn:split(cc.attrs.images, ',')}" var="image">
                <h:graphicImage library="images" name="#{image}" />
            </ui:repeat>
        </div>
    </div>
</cc:implementation>

---

无关与具体问题无关，请尝试与Java/JSF命名约定保持一致.我将您的small_slider.xhtml重命名为renameSlider.xhtml，以便您可以将其用作<cs:smallSlider>，这与所有普通的JSF组件都很好.

---

Unrelated to the concrete problem, try to be consistent with Java/JSF naming conventions. I'd rename your small_slider.xhtml to renameSlider.xhtml so that you can use it as <cs:smallSlider>, which is nicely in line with all normal JSF components.

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