InputText PrimeFaces不应用maxlength

问题描述：

我正在使用PrimeFaces 3.4和PrimeFaces Mobile 0.9.3。我在inputText属性中指定了maxlength，但它没有在HTML中呈现。我的代码：

I'm using PrimeFaces 3.4 with PrimeFaces Mobile 0.9.3. I specified maxlength in the inputText attribute, but it is not being rendered across in the HTML. My code:

<p:inputText id="price" value="#{bean.price}" styleClass="r-align" 
type="number" maxlength="9" validator="priceValidator"/>

后来我发现当我从标签中删除type属性时，max length有效。
有谁知道为什么会这样？

Later I found that when I remove the "type" attribute from the tag, max length works. Does anyone know why this is the case?

答

那只是因为 maxlength HTML5 属性c>< input type =number> 元素，因此可以合理地假设PrimeFaces渲染器不会发出它。

That's simply because maxlength attribute is not supported on the HTML5 <input type="number"> element, so it's reasonable to assume that PrimeFaces renderer won't emit it.

相反，您应该使用 min 和 max 属性。从理论上讲，你应该设置为

Instead, you should be using min and max attributes. Theoretically, you should be set with

<p:inputText type="number" max="999999999" />

然而，这对我不起作用。它没有呈现 max （也不是 min ）属性。这反过来可能是PrimeFaces组件的疏忽。最好的办法是向PrimeFaces人员报告这个问题。

However, this didn't work for me. It didn't render the max (nor the min) attribute altogether. This is in turn likely an oversight in the PrimeFaces component. Your best bet is to report it as an issue to PrimeFaces guys.

同时，您可以通过提供这样的自定义渲染器来解决这个问题，它基本上会添加 min 和 max 属性到pass thru属性列表：

In the meanwhile, you can work this around by providing a custom renderer like this which basically adds the min and max attributes to the list of pass thru attributes:

package com.example;

import java.io.IOException;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

import org.primefaces.component.inputtext.InputTextRenderer;

public class MyInputTextRenderer extends InputTextRenderer {

    @Override
    protected void renderPassThruAttributes(FacesContext facesContext, UIComponent component, String[] attrs) throws IOException {
        String[] newAttrs = new String[attrs.length + 2];
        System.arraycopy(attrs, 0, newAttrs, 0, attrs.length);
        newAttrs[newAttrs.length - 2] = "min";
        newAttrs[newAttrs.length - 1] = "max";
        super.renderPassThruAttributes(facesContext, component, newAttrs);
    }

}

您可以通过以下方式运行注册如下：

which you can get to run by registering it as follows:

<render-kit>
    <renderer>
        <component-family>org.primefaces.component</component-family>
        <renderer-type>org.primefaces.component.InputTextRenderer</renderer-type>
        <renderer-class>com.example.MyInputTextRenderer</renderer-class>
    </renderer>
</render-kit>

请注意，在即将推出的JSF 2.2中，将自然地支持传递自定义JSF组件属性，其他HTML5 数据 - * 属性*。

Note that passing through custom JSF component attributes will be natively supported in the upcoming JSF 2.2, which allows among others HTML5 data-* attribute freedom.

如何让JSF传递HTML属性

How to let JSF pass through HTML attributes

InputText PrimeFaces不应用maxlength

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