RichFaces - 输入组件
到目前为止,我们已经了解了 RichFaces 的不同 AJAX 组件以及名为“Skin”的新功能的很多知识。在本章中,我们将学习 RichFaces 提供的不同“丰富”组件,以开发现代 Web 应用程序。以下是“RichFaces”提供的不同输入组件。
<丰富:就地输入>
Rich inplaceInput 提供了创建可编辑文本框而不是普通输入文本框的机会。在下面的示例中,我们将使用此组件创建一个可编辑文本框。创建一个 xhtml 文件并将其命名为“richinplaceInput.xhtml”。在该文件中写入以下代码。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head> <title>TODO supply a title</title> </h:head> <h:body> <f:view></f:view> <h:form> <rich:inplaceInput value = "#{managedBean.message}" defaultLabel = "Enter Your Name"/> </h:form> </h:body> </html>
保存该文件并运行它。以下将是浏览器中的输出。
继续在该文本框中输入您选择的任何内容,然后按 Enter 键。该标签还提供内联编辑选项。编辑后输出如下。
<丰富:就地选择>
这是 RichFaces 提供的另一个输入标记,用户可以从下拉列表中选择输入值,该标记本质上也是内联且可编辑的。我们需要从内部 bean 类填充下拉列表。请创建一个“xhtml”文件并将其命名为“richinplaceSelectExample.xhtml”。将以下代码放入该文件中。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head> <title>TODO supply a title</title> </h:head> <h:body> <h:form> <rich:inplaceSelect value = "#{subject.subjectName}" defaultLabel = "Click to Select Country"> <f:selectItems value = "#{subject.SubJectList()}"></f:selectItems> </rich:inplaceSelect> </h:form> </h:body> </html>
在上面的示例中,我们将从后端填充下拉选项。这是名为“subject.java”的 bean 类。
import java.util.ArrayList; import java.util.List; import javax.faces.bean.ManagedBean; import javax.faces.bean.ManagedProperty; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class Subject { String SubjectName; public Subject() { } public Subject(String SubjectName) { this.SubjectName = SubjectName; } public List<String> SubJectList() { //this list to be rendered ArrayList<String> list = new ArrayList<>(); list.add("JAVA"); list.add("DOTNET"); list.add("COBOL"); list.add("AJAX"); list.add("JAVA SCRIPT"); return list; } public String getSubjectName() { return SubjectName; } public void setSubjectName(String SubjectName) { this.SubjectName = SubjectName; } }
我们通过列表传递的所有主题名称都将显示在下拉菜单中。以下是运行该应用程序后的输出。
<丰富:意见箱>
<rich:SuggestionBox> 用于根据输入文本框中提供的输入向用户提供建议。该标签在内部创建一个 JS 事件并调用所需的 istener 类以提供来自后端的建议。不幸的是,在 RichFaces 4 中,这个 suggestBox 和 ComboBox 都被组合成一个名为“<rich:autocomplete>”的单独标签,但是,如果您使用的是 RichFaces 3,则可以使用该标签,如下所示。
<h:inputText id = "city" value = "#{capitalsBean.capital}" /> <rich:suggestionbox for = "city" var = "result" suggestionAction = "#{capitalsBean.autocomplete}"> <h:column> <h:outputText value = "#{result.name}" /> </h:column> </rich:suggestionbox>
其中“capitalsBean”将是一个具有不同参数的Java类,名为“autocomplete”的侦听器类将在运行时设置“capital”实例变量的值并提供所需的选择输出。强烈建议使用 RichFaces 4“自动完成”,而不是使用此标签,因为设计人员不再支持此标签。
<丰富:组合框>
<rich:comboBox> 的工作方式与 <rich:suggestionBox> 完全相同,但是,此标记不是调用侦听器类,而是将一些建议预先呈现到客户端浏览器中,这些建议相互交互并提供所需的输出。与 <rich:sugegstionBox> 一样,此功能在新版本中也被弃用,并使用另一个名为“<rich:autocomplete>”的标签,如以下代码所示。
创建一个单独的文件并将其命名为“richAutoComplete.xhtml”。将以下代码放入该文件中。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head></h:head> <h:body> <h:form id = "form"> <h:form id = "form"> <rich:autocomplete mode = "cachedAJAX" minChars = "2" autocompleteMethod = "#{autoComplete.SubJectList()}" /> </h:form> </h:form> </h:body> </html>
在上面的示例中,我们通过 RichFaces 的自动完成功能填充主题列表。创建另一个 Java 类并将其命名为“autoComplete.java”。
import java.util.ArrayList; import java.util.List; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class autoComplete { public autoComplete(){} private List<String> autoCompleteList=new ArrayList<>(); public List<String> SubJectList() { //ArrayList<String> list = new ArrayList<>(); autoCompleteList.add("JAVA"); autoCompleteList.add("DOTNET"); autoCompleteList.add("COBOL"); autoCompleteList.add("AJAX"); autoCompleteList.add("JAVA SCRIPT"); return autoCompleteList; } public List<String> getAutoCompleteList() { return autoCompleteList; } public void setAutoCompleteList(List<String> autoCompleteList) { this.autoCompleteList = autoCompleteList; } }
上面的文件充当 bean 类,SubjectList() 是方法,它实际上将响应呈现给浏览器。在 <SuggestionBox>、<ComboBox> 标记中,我们需要实现侦听器类,但是,在 <autocomplete> 标记的情况下,侦听器类的创建已自动完成,这对开发人员来说更容易。上面的代码将在浏览器中产生以下输出。
<rich:inputNumberSlider>
这是一个非常简单的标签,可以帮助开发人员根据数字间隔创建数字滑块。创建“inputNumberSlider.xhtml”文件并将以下代码放入其中。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head></h:head> <h:body> <h:form> <h:outputText value = "Slide Bar example"></h:outputText> <rich:inputNumberSlider minValue = "1" maxValue = "10" showArrows = "false" showTooltip = "false" step = "1"> </rich:inputNumberSlider> </h:form> </h:body> </html>
在上面的示例中,属性几乎是描述性的。上面的代码将在浏览器中产生以下输出。
<丰富:日历>
顾名思义,此标签将帮助在浏览器中创建日历。创建一个单独的文件并将其命名为“richCalendar.xhtml”。将以下代码放入其中。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head></h:head> <h:body> <h:form> <h1>Calendar</h1> <rich:calendar value = "#{calendarBean.selectedDate}" locale = "#{calendarBean.locale}" popup = "#{calendarBean.popup}" datePattern = "#{calendar.pattern}" style = "width:200px"> </rich:calendar> </h:form> </h:body> </html>
我们需要创建另一个名为“calendarBean.java”的类来保存所有日历值,例如日期、区域设置、日期模式等。以下是“calendarBean.java”的代码。
import java.text.DateFormat; import java.util.Date; import java.util.Locale; import javax.faces.event.ValueChangeEvent; public class CalendarBean { private static final String[] WEEK_DAY_LABELS = new String[] { "Sun *", "Mon +", "Tue +", "Wed +", "Thu +", "Fri +", "Sat *" }; private Locale locale; private boolean popup; private boolean readonly; private boolean showInput; private boolean enableManualInput; private String pattern; private Date currentDate; private Date selectedDate; private String jointPoint; private String direction; private String boundary; private boolean useCustomDayLabels; public Locale getLocale() { return locale; } public void setLocale(Locale locale) { this.locale = locale; } public boolean isPopup() { return popup; } public void setPopup(boolean popup) { this.popup = popup; } public String getPattern() { return pattern; } public void setPattern(String pattern) { this.pattern = pattern; } public CalendarBean() { locale = Locale.US; popup = true; pattern = "MMM d, yyyy"; jointPoint = "bottomleft"; direction = "bottomright"; readonly = true; enableManualInput = false; showInput = true; boundary = "inactive"; } public boolean isShowInput() { return showInput; } public void setShowInput(boolean showInput) { this.showInput = showInput; } public boolean isEnableManualInput() { return enableManualInput; } public void setEnableManualInput(boolean enableManualInput) { this.enableManualInput = enableManualInput; } public boolean isReadonly() { return readonly; } public void setReadonly(boolean readonly) { this.readonly = readonly; } public void selectLocale(ValueChangeEvent event) { String tLocale = (String) event.getNewValue(); if (tLocale != null) { String lang = tLocale.substring(0, 2); String country = tLocale.substring(3); locale = new Locale(lang, country, ""); } } public boolean isUseCustomDayLabels() { return useCustomDayLabels; } public void setUseCustomDayLabels(boolean useCustomDayLabels) { this.useCustomDayLabels = useCustomDayLabels; } public Object getWeekDayLabelsShort() { if (isUseCustomDayLabels()) { return WEEK_DAY_LABELS; } else { return null; } } public String getCurrentDateAsText() { Date currentDate = getCurrentDate(); if (currentDate ! = null) { return DateFormat.getDateInstance(DateFormat.FULL).format(currentDate); } return null; } public Date getCurrentDate() { return currentDate; } public void setCurrentDate(Date currentDate) { this.currentDate = currentDate; } public Date getSelectedDate() { return selectedDate; } public void setSelectedDate(Date selectedDate) { this.selectedDate = selectedDate; } public String getJointPoint() { return jointPoint; } public void setJointPoint(String jointPoint) { this.jointPoint = jointPoint; } public void selectJointPoint(ValueChangeEvent event) { jointPoint = (String) event.getNewValue(); } public String getDirection() { return direction; } public void setDirection(String direction) { this.direction = direction; } public void selectDirection(ValueChangeEvent event) { direction = (String) event.getNewValue(); } public String getBoundary() { return boundary; } public void setBoundary(String boundary) { this.boundary = boundary; } }
上面的代码将在浏览器中生成以下输出。
<rich:InputNumberSpinner>
该标签帮助开发人员创建一个微调器来填充 bean 的实例。以下示例将帮助您详细了解 Spinner 标签。请创建一个单独的 xhtml 文件并将其命名为“InputNumberSpinner.xhtml”,并将以下代码放入其中。
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE html> <html xmlns = "http://www.w3.org/1999/xhtml" xmlns:h = "http://java.sun.com/jsf/html" xmlns:f = "http://java.sun.com/jsf/core" xmlns:ui = "http://java.sun.com/jsf/facelets" xmlns:a4j = "http://richfaces.org/a4j" xmlns:rich = "http://richfaces.org/rich"> <h:head> <title>Number Slider Example</title> </h:head> <h:body> <h:form> <h:outputText value = "Select a Date"></h:outputText> <br/> <br/> <rich:inputNumberSpinner minValue = "1" maxValue = "31" step = "1"> </rich:inputNumberSpinner> </h:form> </h:body> </html>
上面的代码将在浏览器中产生以下输出。