将p:calendar设为只读

我想将 <p:calendar> 设为只读只能由于此问题从日历中选择日期(但这不是解决方案).

I want to make <p:calendar> readonly so that users can only choose a date from the calendar because of this issue (this is not a solution though).

为此，我正在做readonly="#{facesContext.renderResponse}"，如此答案所述，

For this to be so, I'm doing readonly="#{facesContext.renderResponse}" as mentioned by this answer like,

<p:calendar id="calendarId" 
        value="#{bean.property}" 
        converter="#{jodaTimeConverter}" 
        pattern="dd-MMM-yyyy hh:mm:ss a" 
        showOn="button" 
        readonly="#{facesContext.renderResponse}" 
        effect="slideDown"
        required="true" 
        showButtonPanel="true" 
        navigator="true"/>

这有效，但是在加载页面时(在地址栏中键入URL，然后按Enter键)，facesContext.renderResponse返回false，并且日历不再是只读的.当我按<p:commandButton>提交表单时，它的值为true.

This works but when the page is loaded (typing the URL in the address bar and then pressing the enter key), facesContext.renderResponse returns false and the calendar is no longer readonly. It evaluates to true, when I submit the form by pressing <p:commandButton>.

那么，如何在加载页面时使日历变为只读状态?

So, how to make the calendar readonly, when the page is loaded?

P.S:我正在使用PrimeFaces 3.5和Mojarra 2.1.9.

P.S : I'm using PrimeFaces 3.5 and Mojarra 2.1.9.