显示JSF错误消息 [英] Showing the JSF Error Messages

问题描述

我使用的JSF Myfaces Impl 1.2没有tomahawk和其他libs：

I am using JSF Myfaces Impl 1.2 without tomahawk and other libs :

我使用不同的样式+图像显示JSF错误消息，下面的示例。 / p>

I am using different styles + images to show JSF Error messages, find below a sample.

<h:panelGroup rendered="${adminBean.showErrorIcon==2}">
<table width="375" align="center" class="InfoMsg" border="1"
    cellspacing="0" cellpadding="0">
    <tr>
    <td>
    <table width="375" align="center" class="InfoMsg" border="0">
        <tr>
            <td width="50"><img src="static/images/info_icon.gif"
                width="40" height="40" border="0" /></td>
            <td width="325" align="left"><h:messages layout="table"
                errorClass="InfoMsg" /></td>
        </tr>
    </table>
    </td>
</tr>
</table>

基于int变量我在显示一个差异图像和相应的FacesMessage（s）在屏幕中 - 只有2个例子 - 错误或信息。

Based on the int variable of the Backing Bean , I am displaying a diff image and the corresponding FacesMessage(s) in the screen - only 2 cases - error or an information.

我使用下面的设置Backing Bean变量的代码

I am using the below code to set the variable of the Backing Bean

//Checking if there are messages!
    log.debug("Checking if there are messages to be shown ]");
    if(getShowErrorIcon()==99){//Set only if the value is still the default :
        log.debug("getShowErrorIcon was DEFAULT - Changing it ]");
        Iterator<FacesMessage> messages = FacesContext.getCurrentInstance().getMessages();
        if(messages != null && getShowErrorIcon()==99){//Set Error/Info for messages that are not added here :
            while(messages.hasNext()){
                log.debug("There are ***messages***");
                FacesMessage aMessage =(FacesMessage) messages.next();
                if(aMessage.getSeverity().compareTo(FacesMessage.SEVERITY_ERROR)==0){
                    setShowErrorIcon(1);
                    break;//just once is enough
                }
                if(aMessage.getSeverity().compareTo(FacesMessage.SEVERITY_INFO)==0){
                    setShowErrorIcon(2);
                    break;
                }
            }
        }
    }//if it is not default, then something has been set already, why again?

现在我遇到的问题是，有由FacesMessage（s）添加的MyFacesImpl required = true和在PROCESS_VALIDATION阶段期间添加的自定义验证器消息，这些不会显示在屏幕中，因为我没有设置Backing Bean的整数变量，并且因为INVOKE_APPLICATION阶段没有被调用（这意味着上面的代码未调用!!!）

Now the problem I have is , There are FacesMessage(s) that are added by the MyFacesImpl - like the required=true and the custom validator messages which are added during PROCESS_VALIDATION Phase, These are not shown in the screen since my integer variable of the Backing Bean is not set , and since the INVOKE_APPLICATION Phase was not called (and that means the above code was not called!!!)

如何解决这个问题？

欣赏你的帮助。谢谢！

推荐答案

我不知道，但这一切看起来像不必要的过于复杂。要根据邮件严重性更改图标/样式，只需使用CSS权限。您可以根据消息的严重性使用< 的属性，使用 infoClass 和 errorClass ; h：messages> ，您可以将图标指定为CSS背景图片。

I'm not sure, but this all look like unnecessarily overcomplicated. To change icons/styles based on the message severity, just make use of the CSS powers. You can specify different CSS classes based on message severity using infoClass and errorClass attributes of the <h:messages> and you can specify the icons as CSS background image.

JSF：

<h:messages id="messages" layout="table" infoClass="info" errorClass="error" />

CSS：

#messages .info td {
    background: url('info.gif') no-repeat left center;
    padding-left: 15px;
}
#messages .error td {
    background: url('error.gif') no-repeat left center;
    padding-left: 15px;
}

< h：messages layout = > 本身已经呈现了一个HTML < table> 。我认为整个桌子周围是不必要的。只需按照通常的CSS方式应用样式。

The <h:messages layout="table"> itself already renders a HTML <table>. I think the whole table around it is unnecessary as well. Just apply styles accordingly the usual CSS way.

#messages {
    width: 375px;
    margin: 0 auto;
    border: 1px black solid;
    border-collapse: collapse;
}

另请参阅：

• W3schools CSS教程/参考


• CSStutorial.net CSS教程



See also:

• W3schools CSS tutorial/reference
• CSStutorial.net CSS tutorial

更新：根据评论，您正在寻找这样的：

Update: as per the comments, you're looking for something like this:

<h:messages layout="table" styleClass="messages info" infoClass="info" errorClass="error" />
<h:messages layout="table" styleClass="messages error" infoClass="info" errorClass="error" />

使用CSS：

.messages {
    width: 375px;
    margin: 0 auto;
    border-collapse: collapse;
    border: 1px black solid;
}
.messages.info {
    background: url('info.gif') no-repeat left center;
}
.messages.error {
    background: url('error.gif') no-repeat left center;
}
.messages.info tr.error, .messages.error tr.info {
    display: none;
}
.messages td {
    padding-left: 15px;
}

这显示两个单独的消息表，一个用于 info 以及其他错误讯息，每个讯息在左侧中央有一个图示。

This shows two separate message tables, one for info and other for error messages, each with a single icon on the left center.

这篇关于显示JSF错误消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！