Adding HTML5 attributes to standard JSF components

For OmniFaces I've recently looked for the least intrusive way (i.e. no custom component/tag/renderer boilerplate necessary) to add HTML5 specific <form>, <input>, <textarea> and <select> attributes like placeholder, autofocus, type="range", etcetera. You can learn about all of those new HTML5 attributes in html5tutorial.info under the section "Web Form 2.0". The JSF renderers by default ignores all attributes which are not officially supported by the components.

After some thinking, this appears the best to achieve using a custom RenderKit which returns a custom ResponseWriter wherein the startElement() and writeAttribute() methods are been overridden to check for the current component and if the developer has specified any custom HTML5-related attributes. This way the developer can just add them to standard JSF <h:form>, <h:inputText>, <h:inputTextarea> and <h:selectXxx> components.

Html5RenderKit

The result was a new OmniFaces feature: Html5RenderKit (source code here). This will be available as per OmniFaces 1.1.

To get it to run, register its factory as follows in faces-config.xml:

<factory>
    <render-kit-factory>org.omnifaces.renderkit.Html5RenderKitFactory</render-kit-factory>
</factory>

Here's a demonstration how all those new HTML5 attributes can be used (note that the <h:form> now also supports the autocomplete attribute, in standard JSF 2.0/2.1 this was so far only supported on input components):

<h:form autocomplete="off">
    <h:panelGrid columns="3">
        <h:outputLabel for="text" value="Normal text" />
        <h:inputText id="text" value="#{bean.text1}" />
        <h:outputText value="Supported in all browsers" />
    
        <h:outputLabel for="placeholder" value="With placeholder" />
        <h:inputText id="placeholder" value="#{bean.text2}" placeholder="type here" />
        <h:outputText value="Since Firefox 4, Safari 4, Chrome 10, Opera 11.10 and IE 10" />
    
        <h:outputLabel for="autofocus" value="With autofocus" />
        <h:inputText id="autofocus" value="#{bean.text3}" autofocus="true" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 6, Opera 11 and IE 10" />

        <h:outputLabel for="search" value="Search" />
        <h:inputText id="search" type="search" value="#{bean.search}" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 6, Opera 10.6 and IE 9" />
    
        <h:outputLabel for="email" value="Email" />
        <h:inputText id="email" type="email" value="#{bean.email}" />
        <h:outputText value="Since Firefox 4, Chrome 6, Opera 10.6 and IE 10" />
    
        <h:outputLabel for="url" value="URL" />
        <h:inputText id="url" type="url" value="#{bean.url}" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 6, Opera 10.6 and IE 10" />
    
        <h:outputLabel for="phone" value="Phone" />
        <h:inputText id="phone" type="tel" value="#{bean.phone}" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 6, Opera 10.6 and IE 10" />
    
        <h:outputLabel for="range" value="Range (between 1 and 10)" />
        <h:inputText id="range" type="range" value="#{bean.range}" min="1" max="10" />
        <h:outputText value="Since Safari 4, Chrome 6, Opera 11 and IE 10" />
    
        <h:outputLabel for="number" value="Number (between 7 and 13)" />
        <h:inputText id="number" type="number" value="#{bean.number}" min="7" max="13" />
        <h:outputText value="Since Safari 4, Chrome 9 and Opera 11" />
    
        <h:outputLabel for="date" value="Date" />
        <h:inputText id="date" type="date" value="#{bean.date}"
            converterMessage="Format must be yyyy-MM-dd">
            <f:convertDateTime pattern="yyyy-MM-dd" />
        </h:inputText>
        <h:panelGroup>
            <h:outputText value="Since Opera 10.6" 
                rendered="#{not facesContext.validationFailed}" />
            <h:message for="date" />
        </h:panelGroup>
    
        <h:outputLabel for="textarea1" value="Textarea with maxlength of 20" />
        <h:inputTextarea id="textarea1" value="#{bean.text4}" cols="16" maxlength="20" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 6, Opera 11 and IE 10" />
    
        <h:outputLabel for="textarea2" value="Textarea with placeholder" />
        <h:inputTextarea id="textarea2" value="#{bean.text5}" cols="16" placeholder="some text" />
        <h:outputText value="Since Firefox 4, Safari 5, Chrome 10, Opera 11.50 and IE 10" />
    
        <h:panelGroup />
        <h:commandButton value="submit">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:panelGroup>
            <h:outputText value="OK!"
                rendered="#{facesContext.postback and not facesContext.validationFailed}" />
        </h:panelGroup>
    </h:panelGrid>
</h:form>

With this backing bean:

@ManagedBean
@ViewScoped
public class Bean implements Serializable {

    private String text1;
    private String text2;
    private String text3;
    private String search;
    private String email;
    private String url;
    private String phone;
    private Integer range;
    private Integer number;
    private Date date;
    private String text4;
    private String text5;

    // Add/generate getters/setters.
}

Here's a screenshot of how it look like in Chrome 19: