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2018/6/18

ZK MVVM上傳檔案

ZK MVVM上傳檔案範例如下。

index.zul

<zk>
<window apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('idv.matt.vm.MyVM')">
    <div>
        <fileupload label="上傳圖片" onUpload="@command('upload')" /><label value="@load(vm.uploadFileName)"/>
        <image content="@load(vm.uploadImage)"/>
    </div>  
</window>
</zk>

在ViewModel的upload()方法中利用@ContextParam傳入隱含物件BindContext並呼叫getTriggerEvent()取得上傳事件來取得上傳的檔案。

MyVM.java

package idv.matt.vm;

import org.zkoss.bind.BindContext;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.ContextParam;
import org.zkoss.bind.annotation.ContextType;
import org.zkoss.bind.annotation.NotifyChange;
import org.zkoss.image.Image;
import org.zkoss.util.media.Media;
import org.zkoss.zk.ui.event.UploadEvent;
import org.zkoss.zul.Messagebox;


public class MyVM {

    private Image uploadImage;
    private String uploadFileName;
    
    @Command
    @NotifyChange({"uploadImage","uploadFileName"})
    public void upload(@ContextParam(ContextType.BIND_CONTEXT)  BindContext ctx) {
        UploadEvent event =(UploadEvent) ctx.getTriggerEvent();
        Media media = event.getMedia();
        if(media instanceof Image) {
            uploadImage = (Image) media;
            uploadFileName = media.getName();
        } else {
            Messagebox.show("Not an image: "+ media, "Error", Messagebox.OK, Messagebox.ERROR);
        }
    }

    // getter and setter ommitted
}

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