playframework - 如何扩展 Play！框架模板标签

Question

我想扩展内置的#{a模板标签。例如，不是每次都写：

#{a @Controller.Action(parameter.slugify()) /}

如果parameter="This Is a Test"那么生成href的是http://localhost/controller/action/this-is-a-test

我想扩展它，以便默认情况下始终对参数进行 slugified，而无需明确使用.slugify().

谢谢

Answer 1

您要做的是定义自己的快速标签。这里有一个很好的例子。也检查这个答案。

代码可能如下所示：

@FastTags.Namespace("mytags")
public class MyTags extends play.templates.FastTags{


    public static void _a(Map<?, ?> args, Closure body, PrintWriter out, ExecutableTemplate template, int fromLine) {
        ActionDefinition actionDef = (ActionDefinition) args.get("arg");
        if (actionDef == null) {
            actionDef = (ActionDefinition) args.get("action");
        }
        if (!("GET".equals(actionDef.method))) {
            if (!("POST".equals(actionDef.method))) {
                String separator = actionDef.url.indexOf('?') != -1 ? "&" : "?";
                actionDef.url += separator + "x-http-method-override=" + actionDef.method;
                actionDef.method = "POST";
            }
            String id = Codec.UUID();
            out.print("<form method=\"POST\" id=\"" + id + "\" " +(args.containsKey("target") ? "target=\"" + args.get("target") + "\"" : "")+ " style=\"display:none\" action=\"" + actionDef.url + "\">");
            _authenticityToken(args, body, out, template, fromLine);
            out.print("</form>");
            out.print("<a href=\"javascript:document.getElementById('" + id + "').submit();\" " + serialize(args, "href") + ">");
            out.print(JavaExtensions.toString(body));
            out.print("</a>");
        } else {
            out.print("<a href=\"" + actionDef.url + "\" " + JavaExtensions.slugify(serialize(args, "href")) + ">");
            out.print(JavaExtensions.toString(body));
            out.print("</a>");
        }
    }
}

并在您的模板中这样调用：

#{mytags.a @Controller.Action(parameter) /}