Primefaces : GraphicImage 不刷新 [英] Primefaces : GraphicImage does not refresh

问题描述

我想要一个按钮和一个图形图像.默认情况下，不显示图形图像.如果用户单击按钮，则显示图形图像(rendered = true).

I waant to have abutton and a graphicimage. By default, the graphicimage is not displayed. If the user click on the button, the graphic image is displayed (rendered = true).

我可以做到，但我必须刷新页面才能看到显示的图形图像.

I can do it but I have to refresh the page to see the graphicimage displayed.

我想我必须使用ajax组件才能在单击按钮时直接显示，但我无法正确使用它.你能指导我吗?

I think I have to use ajax component to make the displaying directly when the button is clicked but I don't manage to use it corectly. Could you guide me?

xhtml:

<h:body>
    <h:form>
        <p:commandButton value="Prendre la photo générique"
            id="boutonPhotoGenerique" icon="ui-icon-image"
            action="#{defaultCommandBean.affichePhotoGenerique}">
            <p:graphicImage id="photoGenerique"
                rendered="#{defaultCommandBean.rendered}"
                value="photos/photo_generique.jpg" />
        </p:commandButton>
    </h:form>
</h:body>

托管 Bean:

@ManagedBean(name = "defaultCommandBean")
@SessionScoped
public class DefaultCommandBean {

    private boolean rendered;

    public boolean isRendered() {
        return rendered;
    }

    public void setRendered(boolean rendered) {
        this.rendered = rendered;
    }

    public void affichePhotoGenerique() {
        rendered = true;
    }
}

推荐答案

我发现了问题:我用一个面板组件包围了我的graphicImage组件，带有 id="panel" ;并将我的更新属性修改为 update="panel" .现在，图片直接显示.

I found the problem : I surrounded my graphicImage component with a panel component, with id="panel" ; and modified my update attribute to update="panel" . Now, the picture is directy displayed.

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