JSF 2:如何在同一输入中显示不同的ajax状态?

时间:2011-08-12 17:15:17

标签: java jsf jsf-2

我希望在每个字段失去焦点时验证表单中的每个字段,当发生这种情况时,我希望这些操作发生:

1)在该字段的右侧出现一个图像,一个.gif(表示系统正在检查用户输入)

2)当完成时出现另一个.gif(例如,取决于输入,'sucess.gif'或'error.gif')和右侧的消息。

我不想使用popup或类似的东西,用户将失去可用性,我不想要这个。

我正在尝试这样做,这是我到目前为止所做的:

<h:form id="form">
    <h:panelGrid columns="3" >
        <h:outputLabel for="first_name" value="First Name:" />
        <h:inputText id="first_name" value="#{register.bean.firstName}" >
            <f:ajax event="blur" render="m_first_name" />
        </h:inputText>

        <a4j:status name="ajaxStatus">
            <f:facet name="start">
                <h:graphicImage name="loader.gif" library="images" />
                <h:outputText value="Processing ..." />
            </f:facet>
        </a4j:status>

        <a4j:commandButton value="Register !" action="#{register.validateName}" status="ajaxStatus" />

    </h:panelGrid>
</h:form>

我在谷歌上寻找一些解决方案,我认为

<a:a4j ... >

是我的最佳选择,因为onbeginoncomplete属性。 在JSF 2中的某些本地标记中有一些属性?

更新: @BalusC方法:

<!DOCTYPE html>
<html lang="pt-br"
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Insert title here</title>

        <script type="text/javascript">

        function showProgress(data) {
            var inputElement = data.source; // The HTML DOM input element.
            var ajaxStatus = data.status; // Can be "begin", "success" and "complete"
            var messageForInputElement = document.getElementById(inputElement.id + "_message");

            switch (ajaxStatus) {
                case "begin": // This is called right before ajax request is been sent.
                    messageForInputElement.innerHTML = "validating...";
                    break;

                case "complete": // This is called right after ajax response is received.
                    messageForInputElement.innerHTML = "";
                    break;

                case "success": // This is called when ajax response is successfully processed.
                    if (messageForInputElement.innerHTML.length == 0) { // So, no message has been set.
                        messageForInputElement.innerHTML = "valid!";
                    }
                    break;
            }
        }
        </script>

    </h:head>

    <h:body>
        <h:form id="form">
            <h:panelGrid columns="3">
                <h:outputLabel for="first_name" value="First Name" />
                <h:inputText id="first_name" value="#{bean.firstName}" required="true">
                    <f:ajax event="blur" render="first_name_message" onevent="showProgress" />
                </h:inputText>
                <h:message id="first_name_message" for="first_name" />

                <h:panelGroup />
                <h:commandButton value="Submit" action="#{register.doSomething}">
                    <f:ajax execute="@form" render="@form" />
                </h:commandButton>
                <h:messages globalOnly="true" layout="table" />
            </h:panelGrid>
        </h:form>
    </h:body>
</html>

这是我的豆子:

@ManageBean
@ViewScope
..

public void doSomething(){
    try {
        Thread.sleep(2000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

1 个答案:

答案 0 :(得分:12)

Ajax4jsf的onbeginoncomplete属性只是JSF2标准<f:ajax>标记的现有onevent属性的额外抽象。您只需要引入一些额外的JavaScript代码即可实现相同的功能。

这是一个启动示例:

<h:form>
    <h:panelGrid columns="3">
        <h:outputLabel for="input1" value="Input 1" />
        <h:inputText id="input1" value="#{bean.input1}" required="true">
            <f:ajax event="blur" render="input1_message" onevent="showProgress" />
        </h:inputText>
        <h:message id="input1_message" for="input1" />

        <h:outputLabel for="input2" value="Input 2" />
        <h:inputText id="input2" value="#{bean.input2}" required="true">
            <f:ajax event="blur" render="input2_message" onevent="showProgress" />
        </h:inputText>
        <h:message id="input2_message" for="input2" />

        <h:panelGroup />
        <h:commandButton value="Submit" action="#{bean.submit}">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:messages globalOnly="true" layout="table" />
    </h:panelGrid>
</h:form>

以下是showProgress函数的基本启动示例。 data参数是一个JS对象,其属性已在JSF specification的表14-4和14-3中描述。

function showProgress(data) {
    var inputElement = data.source; // The HTML DOM input element.
    var ajaxStatus = data.status; // Can be "begin", "success" and "complete"

    var messageForInputElement = document.getElementById(inputElement.id + "_message");

    switch (ajaxStatus) {
        case "begin": // This is called right before ajax request is been sent.
            messageForInputElement.innerHTML = "validating...";
            break;

        case "complete": // This is called right after ajax response is received.
            messageForInputElement.innerHTML = "";
            break;

        case "success": // This is called when ajax response is successfully processed.
            if (messageForInputElement.innerHTML.length == 0) { // So, no message has been set.
                messageForInputElement.innerHTML = "valid!";
            }
            break;
    }
}

您可以使用例如图像替换此启动示例的innerHTML,或者在使用CSS背景图像的消息元素上添加/删除CSS样式类等。这对于保持crossbrowser兼容并不是一件容易的事。我建议在那里投入一些jQuery

基本上,Ajax4jsf的onbeginoncomplete属性消除了您使用switch编写整个JS函数以实现所需功能的需要。您可以直接引用一些JavaScript函数,这些函数与case的{​​{1}}语句中的相同。这只是一个额外的抽象。您可能需要考虑使用它,以便最大限度地减少样板代码的数量。