(Apache Wicket) 从 js 函数设置 java 属性
(Apache Wicket) Set java atrribute from a js function
我是 Apache Wicket 的新手,我需要在 Java 属性上设置值。该值来自 JS 上的 var,由特定 GIS 库 (https://leaflet.github.io/Leaflet.draw/docs/leaflet-draw-latest.html) 中的特定函数填充。此设置必须由某些组件行为触发。
这是一个简化的示例代码:
检票口网页:
public class MapPage extends WebPage {
private static final long serialVersionUID = 1L;
private Integer coordinates;
// getters and setters
}
检票口 html:
<html xmlns:wicket="http://wicket.apache.org">
<head>
<!-- metas, scripts, and css imports -->
</head>
<body>
<script>
// component declarations
var coordinates = ''
map.on('draw:edited', function (e) {
e.layers.eachLayer(function(layer) {
coordinates = toWKT(layer);
// send coordinates to coordinates java attribute ??? how??
});
});
</script>
</body>
非常感谢!
这是我的一个项目中的一段代码,我想在其中处理对 (HighCharts) 图表的点击。它将数据传递给 Wicket,然后 Wicket 更新另一个面板以显示与点击相关的详细信息。
相关的javascript部分,其中interactionurl实际上是后面行为生成的callbackScript:
interactionurl(JSON.stringify(myDataToPass));
行为:
this.add( this.interactionbehavior = new AbstractDefaultAjaxBehavior()
{
@Override
protected void respond( final AjaxRequestTarget target )
{
RequestCycle cycle = RequestCycle.get();
WebRequest webRequest = (WebRequest) cycle.getRequest();
String param1 = webRequest.getQueryParameters().getParameterValue( "mydict" ).toString( "" );
//param1 contains the JSON map passed from javascript.
//you can also do stuff now, like replacing components using ajax
}
@Override
protected void updateAjaxAttributes( AjaxRequestAttributes attributes )
{
super.updateAjaxAttributes( attributes );
attributes.getExtraParameters().put( "mydict", "__PLACEHOLDER__" );
}
@Override
public CharSequence getCallbackScript()
{
String script = super.getCallbackScript().toString().replace( "\"__PLACEHOLDER__\"", "data" );
return script;
}
} );
您只需要在某个时刻将交互 url 传递到页面即可。为此,您可以在具有以下行为的组件中使用 renderHead
:
@Override
public void renderHead( final IHeaderResponse response )
{
...
//use the `setupCallback` to store the callback script somewhere.., I store it in 'interactionurl'
String script = String.format( " setupCallback(this.interactionbehavior.getCallbackScript()); ");
response.render( OnDomReadyHeaderItem.forScript( script )
}
我是 Apache Wicket 的新手,我需要在 Java 属性上设置值。该值来自 JS 上的 var,由特定 GIS 库 (https://leaflet.github.io/Leaflet.draw/docs/leaflet-draw-latest.html) 中的特定函数填充。此设置必须由某些组件行为触发。
这是一个简化的示例代码:
检票口网页:
public class MapPage extends WebPage {
private static final long serialVersionUID = 1L;
private Integer coordinates;
// getters and setters
}
检票口 html:
<html xmlns:wicket="http://wicket.apache.org">
<head>
<!-- metas, scripts, and css imports -->
</head>
<body>
<script>
// component declarations
var coordinates = ''
map.on('draw:edited', function (e) {
e.layers.eachLayer(function(layer) {
coordinates = toWKT(layer);
// send coordinates to coordinates java attribute ??? how??
});
});
</script>
</body>
非常感谢!
这是我的一个项目中的一段代码,我想在其中处理对 (HighCharts) 图表的点击。它将数据传递给 Wicket,然后 Wicket 更新另一个面板以显示与点击相关的详细信息。
相关的javascript部分,其中interactionurl实际上是后面行为生成的callbackScript:
interactionurl(JSON.stringify(myDataToPass));
行为:
this.add( this.interactionbehavior = new AbstractDefaultAjaxBehavior()
{
@Override
protected void respond( final AjaxRequestTarget target )
{
RequestCycle cycle = RequestCycle.get();
WebRequest webRequest = (WebRequest) cycle.getRequest();
String param1 = webRequest.getQueryParameters().getParameterValue( "mydict" ).toString( "" );
//param1 contains the JSON map passed from javascript.
//you can also do stuff now, like replacing components using ajax
}
@Override
protected void updateAjaxAttributes( AjaxRequestAttributes attributes )
{
super.updateAjaxAttributes( attributes );
attributes.getExtraParameters().put( "mydict", "__PLACEHOLDER__" );
}
@Override
public CharSequence getCallbackScript()
{
String script = super.getCallbackScript().toString().replace( "\"__PLACEHOLDER__\"", "data" );
return script;
}
} );
您只需要在某个时刻将交互 url 传递到页面即可。为此,您可以在具有以下行为的组件中使用 renderHead
:
@Override
public void renderHead( final IHeaderResponse response )
{
...
//use the `setupCallback` to store the callback script somewhere.., I store it in 'interactionurl'
String script = String.format( " setupCallback(this.interactionbehavior.getCallbackScript()); ");
response.render( OnDomReadyHeaderItem.forScript( script )
}