计算p:inputTextarea中使用的字符，而不是剩余的字符 [英] Count characters used in p:inputTextarea instead of characters remaining

问题描述

我早些时候发布了一个类似的问题，但是我正在寻找一种不同的方法.我有一个inputTextArea，我需要限制可以输入的字符数量以及显示使用的字符数量(例如:使用的31/50个字符").当前，我只是使用inputTextArea的属性来执行此操作，但是，通过这种方式，我只能获得剩余字符的计数.下面是inputTextArea的图片以及执行此操作的代码.

I posted a similar question earlier but I'm looking for a different approach. I have a inputTextArea and I need to limit the amount of characters that can be entered in to it as well as display the amount of characters used (ex: "31/50 characters used"). Currently, I am just using attributes for the inputTextArea to do this, however, this way, I can only get a count for the characters remaining. Below is a picture of the inputTextArea as well as the code to do this.

字符剩余计数器

<p:inputTextarea id="ogdGacOther" rows="1" style="vertical-align: top; width: 98% !important;" styleClass="preformatted" autoResize="false" value="#{rfeBean.rfe.targetOfficerReasonsForReferral.otherOgdGac}" disabled="#{!rfeBean.ogdGacReferralReasonsChecked[ReferralTemplateConstants.OGD_GAC_OTHER] or !raudUserSessionBean.raudUser.referMode or rfeBean.workItemMissing}"
  counter="displayGacCharCount" maxlength="50" counterTemplate="{0} #{msg.rfeCharactersRemaining}">
  <p:ajax event="change" process="@this" />
</p:inputTextarea>
<br/>
<h:outputText id="displayGacCharCount" />

我想知道是否有方法可以修改它，以便显示所使用的字符.计数器模板中的{0}是代表剩余的char数量的数字.如果有人知道我可以使用该{0}调用Java方法的方法，那将是无与伦比的.无论哪种方式，请让我知道您认为最佳的方法.我试图避免使用jQuery的任何JavaScript.

I am wondering if there is way to modify this so that it displays characters used. The {0} in the counter template, is the number that represents the amount of char remaining. If anyone know a way I could call a java method using that {0}, I would be golden. Either way, let me know what you think the best approach. I am trying to avoid using any javascript of jQuery.

我尝试过这样的事情:

<h:outputText id="displayGacCharCount" value="#{rfeBean.methodToChangeCharRemainToCharUsed(valueForCharRemain({0})}" />

尝试此操作时，出现类似"El表达式不平衡"的错误消息

When I tried this, I got an error along the lines of "El Expression is unbalanced"

推荐答案

利亚姆

这很简单，忘记计数器并获取字符串长度:

It's very simple, forget the counter and get the string length:

<p:inputTextarea id="ogdGacOther" rows="1" maxlength="50"
              value="#{rfeBean.rfe.targetOfficerReasonsForReferral.otherOgdGac}">
    <p:ajax event="keyup" update="displayGacCharCount" global="false"/>
    <p:ajax event="keydown" update="displayGacCharCount" global="false"/>
    <p:ajax event="keypress" update="displayGacCharCount" global="false"/>
</p:inputTextarea>

<h:outputText id="displayGacCharCount" 
           value="#{rfeBean.rfe.targetOfficerReasonsForReferral.otherOgdGac.length()}"/>

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