grails如何覆盖g消息标记

Question

我是Grails的新手,所以你可能会觉得我的问题很天真.我想覆盖g消息标记.我想在标记的行为中添加新功能,然后从ValidationTagLib调用原始实现.就我而言,我可以创建自己的taglib,重新定义标签.G message是一个实际上从ValidationTaglib调用messageImpl方法的闭包.我的问题是如何调用此方法？我尝试使用此代码来调用闭包,但是我收到了空格而不是消息:

class MyTagLib {

    static namespace = "g"

    def message = { attrs ->
        //my changes in tag's behaviour
        def validationTagLib = grailsAttributes.applicationContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ValidationTagLib')
        validationTagLib.message.call(attrs)
    }
} 

我非常感谢你的帮助!

Answer 1

您需要扩展Grails ValidationTagLib

import org.codehaus.groovy.grails.plugins.web.taglib.ValidationTagLib

class MyValidationTagLib extends ValidationTagLib {

    /**
     * Resolves a message code for a given error or code from the resource bundle.
     *
     * @emptyTag
     *
     * @attr error The error to resolve the message for. Used for built-in Grails messages.
     * @attr message The object to resolve the message for. Objects must implement org.springframework.context.MessageSourceResolvable.
     * @attr code The code to resolve the message for. Used for custom application messages.
     * @attr args A list of argument values to apply to the message, when code is used.
     * @attr default The default message to output if the error or code cannot be found in messages.properties.
     * @attr encodeAs The name of a codec to apply, i.e. HTML, JavaScript, URL etc
     * @attr locale override locale to use instead of the one detected
     */
    Closure message = { attrs ->
        //my changes in tag's behaviour
        ValidationTagLib validationTagLib = grailsAttributes.applicationContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ValidationTagLib')
        validationTagLib.message.call(attrs)
    }
}