小门6:如何通过AbstractDefaultAjaxBehavior注入javascript函数? [英] Wicket 6: Howto inject a javascript function via AbstractDefaultAjaxBehavior?

问题描述

我有一个页面，页面上附加了一个JavaScript文件.

I have a page that has a JavaScript file attached to it.

JavaScript具有一个函数，最后应调用Wicket通过AbstractDefaultAjaxBehavior注入的函数.

The JavaScript has a function that, at the end should call a function that has been injected by Wicket through AbstractDefaultAjaxBehavior.

JavaScript如下所示:

The JavaScript looks like this:

function updateAmount(amount){
  // do some calculations on amount
  saveAmount(amount);
}

注入的函数应如下所示:

The injected function should look something like this:

function saveAmount(amount){
  Wicket.Ajax.post({
    u: '${callbackUrl}',
    dep: function(){
           return [{name:'amount','value':amount}];
         }
}

我遇到的问题是，当updateAmount调用saveAmount函数时，(控制台)日志指出"saveAmount"未定义.

The problem I have is that when updateAmount calls the saveAmount function the (console) log states that the "saveAmount" is undefined.

如果我查看源代码，注入的函数在那里，但不是以wicket生成的JavaScript而是"AJAX" JavaScript的形式出现.

If I look at the source, the injected function is there but not as JavaScript but as "AJAX" JavaScript generated by wicket.

目标是在JavaScript中调用一个函数，该函数将调用Wicket注入的函数，该函数使用JavaScript提供的参数执行AJAX调用.

The goal is to call a function in JavaScript that will call a function injected by Wicket that performs an AJAX call with parameters that are provided by JavaScript.

我将非常感谢您的帮助.

I would really appreciate any help.

推荐答案

基本上，您应该在自定义AbstractAjaxBehaviour

Basically, you should use the updateAjaxAttributes() and renderHead() in a custom AbstractAjaxBehaviour

在此处查看更多详细信息:

See for more detail here:

http://wickedsource.org/2013/01/07/rolling-your-own-ajax-behavior-with-wicket/

http://wickedsource.org/2013/01/07/rolling-your-own-ajax-behavior-with-wicket/

从Google缓存中检索相关代码(由Tom Hombergs编写):

Retrieved from google cache, relevant code (written by Tom Hombergs):

public class MyAjaxBehavior extends AbstractDefaultAjaxBehavior {

@Override
protected void respond(AjaxRequestTarget target) {
RequestCycle cycle = RequestCycle.get();
WebRequest webRequest = (WebRequest) cycle.getRequest();
StringValue param1 = webRequest.getQueryParameters().getParameterValue("param1");
StringValue param2 = webRequest.getQueryParameters().getParameterValue("param2");
// do whatever you need with param1 and param2
}

@Override
public CharSequence getCallbackScript() {
String script = super.getCallbackScript().toString();
script = script.replace("\"PLACEHOLDER1\"", "param1Value");
script = script.replace("\"PLACEHOLDER2\"", "param2Value");
return script;
}

@Override
protected void updateAjaxAttributes(AjaxRequestAttributes attributes) {
super.updateAjaxAttributes(attributes);
attributes.getExtraParameters().put("param1", "PLACEHOLDER1");
attributes.getExtraParameters().put("param2", "PLACEHOLDER2");
}

@Override
public void renderHead(Component component, IHeaderResponse response) {
super.renderHead(component, response);
String script = "var param1Value = My.JavaScript.Module.calculate1();";
script += "var param2Value = My.JavaScript.Module.calculate2();";
script += getCallbackScript();
response.render(OnDomReadyHeaderItem.forScript(script));
}

}

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