Tapestry数据校验-修改Body.java和Body.js

最新推荐文章于 2021-09-08 14:47:57 发布

转载最新推荐文章于 2021-09-08 14:47:57 发布 · 1k 阅读

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文章标签：

#tapestry #function #button #browser #nested #null

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本文介绍了一个使用Tapestry框架实现的页面渲染过程，包括JavaScript文件的加载、页面元素聚焦、错误处理及按钮事件管理等内容。通过自定义的TapestryEx对象实现了页面元素的操作和事件监听。

1,Body.java:

protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) {
       TapestryUtils.storePageRenderSupport(cycle, this);

       this.addExternalScript(TapestryUtil.getResource(
          "/com/web/tapestry/html/Body.js",cycle));

       IMarkupWriter nested = writer.getNestedWriter();

       renderBody(nested, cycle);

       // Start the body tag.
       writer.println();
       writer.begin(getElement());
       renderInformalParameters(writer, cycle);

       writer.println();

       // Write the page's scripting. This is included scripts
       // and dynamic javascript.

       _pageRenderSupport.writeBodyScript(writer, cycle);

       // Close the nested writer, which dumps its buffered content
       // into its parent.

       nested.close();

       // Any initialization should go at the very end of the document
       // just before the close body tag. Older version of Tapestry
       // would create a window.onload event handler, but this is better
       // (it doesn't have to wait for external images to load).
        // add init script code
        XtradeBasePage page = (XtradeBasePage) this.getPage();
        if (page.getDefaultSubmit() != null)           _pageRenderSupport.addInitializationScript( Script.getDefaultSubmitScript(page.getDefaultSubmit()));

       _pageRenderSupport.writeInitializationScript(writer);

       writer.end(); // <body>
   }

2,Body.js:

var TapestryEx = new Object();

TapestryEx.set_focus = function (field)
{
   if (typeof field == "string")
      field = this.find(field);

   if (field.focus)
       field.focus();

    if (field.select)
        field.select();
}

TapestryEx.default_invalid_field_handler = function(event, field, message)
{
if (!event.abort && !field.disabled)
{
    TapestryEx.set_focus(field);

    window.alert(message);

    event.abort = true;
    event.cancel_handlers = true;
}
}

TapestryEx.find = function(elementId)
{
return document.getElementById(elementId);
}

TapestryEx.register_button = function(buttonId)
{
var button = this.find(buttonId);
if(!button.events)
    button.events = new ButtonEventManager(button);

}

TapestryEx.onclick = function(buttonId, handler)
{
TapestryEx.register_button(buttonId);
var button = this.find(buttonId);
button.events.add_click_handler(handler);

}

// ButtonClickEvent
function ButtonClickEvent(button,type,invalid_field_handler)
{
this.button = button;
this.type = type;
this.invalid_field_handler = invalid_field_handler;
}

ButtonClickEvent.prototype.invalid_field = function(field, message)
{
this.invalid_field_handler.call(window, this, field, message);
}

// ButtonEventManager
function ButtonEventManager(button)
{
this.button = button;
this.handlers = {};
button.onclick = function() { return this.events.onclick_handler(); };
this.invalid_field_handler = TapestryEx.default_invalid_field_handler;
}

// add_handler(type, handler)
ButtonEventManager.prototype.add_handler = function(type, handler)
{
var array = this.handlers[type];
if (array == null)
{
    array = [];
    this.handlers[type] = array;
}
array[array.length]=handler;
}

// invoke_handlers(type, eventObject)
ButtonEventManager.prototype.invoke_handlers = function(type, eventObj)
{
var array = this.handlers[type];
if (array == null) return;
var length = array.length;
for (var i = 0; i < length; i++)
{
    var handler = array[i];
    handler.call(window, eventObj);
}
}

// click()
ButtonEventManager.prototype.click = function(name)
{
   if (this.onclick_handler())
   {
      this.button.onclick = null;
   }
}

// onclick_handler()
ButtonEventManager.prototype.onclick_handler = function()
{
   var event = new ButtonClickEvent(this.button, "click",this.invalid_field_handler);

    this.invoke_handlers("click", event);

   if (event.abort)
      return false;

   return true;
}

// add_click_handler(handler)
ButtonEventManager.prototype.add_click_handler = function(handler)
{
this.add_handler("click", handler);
}

function defaultSubmit(evt,submitName){
if(evt == null){
     evt = window.event;
     browser="IE";
     srcElement=evt.srcElement;
}
else{
     browser="FF";
     srcElement=evt.target;
}
if(evt.which && evt.which == 13 || evt.keyCode && evt.keyCode==13){
      var form = document.forms[0];
      if(form != null){
        if(srcElement.type!='submit'&&srcElement.type!='image')
          if(browser == "IE")
              evt.returnValue=false;
          else if(browser == "FF")
            evt.preventDefault();
          if(document.getElementById(submitName)){
               document.getElementById(submitName).click();
          }
          else
            return document.forms[0].submit();
      }
    }
}

function addEventListener(obj,eventName,eventHandler){
    if(eval(obj+".addEventListener")){
         eval(obj+".addEventListener('"+eventName+"',"+eventHandler+",false);");
    }
    else if(eval(obj+".attachEvent")){
       eval(obj+".attachEvent('on"+eventName+"',"+eventHandler+");");
    }
    else if(eval(obj+".on"+eventName)){
         eval(obj+".on"+eventName+"="+eventHandler);
    }
}

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