htmllinkrendererbase.java

一个使用struts+hibernate+spring开发的完的网站源代码。

        }

        UIForm nestingForm = null;
        String formName;
        DummyFormResponseWriter dummyFormResponseWriter;
        if (parent != null)
        {
            //link is nested inside a form
            nestingForm = (UIForm)parent;
            formName = nestingForm.getClientId(facesContext);
            dummyFormResponseWriter = null;
        }
        else
        {
            //not nested in form, we must add a dummy form at the end of the document
            formName = DummyFormUtils.DUMMY_FORM_NAME;
            dummyFormResponseWriter = DummyFormUtils.getDummyFormResponseWriter(facesContext);
            dummyFormResponseWriter.setWriteDummyForm(true);
        }

        StringBuffer onClick = new StringBuffer();

        String commandOnclick;
        if (component instanceof HtmlCommandLink)
        {
            commandOnclick = ((HtmlCommandLink)component).getOnclick();
        }
        else
        {
            commandOnclick = (String)component.getAttributes().get(HTML.ONCLICK_ATTR);
        }
        if (commandOnclick != null)
        {
            onClick.append(commandOnclick);
            onClick.append(';');
        }

        //call the clear_<formName> method
        onClick.append(HtmlRendererUtils.getClearHiddenCommandFormParamsFunctionName(formName)).append("();");

        String jsForm = "document.forms['" + formName + "']";

        if (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll())
        {
            JavascriptUtils.appendAutoScrollAssignment(onClick, formName);
        }

        //add id parameter for decode
        String hiddenFieldName = HtmlRendererUtils.getHiddenCommandLinkFieldName(formName);
        onClick.append(jsForm);
        onClick.append(".elements['").append(hiddenFieldName).append("']");
        onClick.append(".value='").append(clientId).append("';");
        if (nestingForm != null)
        {
            HtmlFormRendererBase.addHiddenCommandParameter(nestingForm, hiddenFieldName);
        }
        else
        {
            dummyFormResponseWriter.addDummyFormParameter(hiddenFieldName);
        }

        //add child parameters
        for (Iterator it = component.getChildren().iterator(); it.hasNext(); )
        {
            UIComponent child = (UIComponent)it.next();
            if (child instanceof UIParameter)
            {
                String name = ((UIParameter)child).getName();
                Object value = ((UIParameter)child).getValue();

                renderLinkParameter(dummyFormResponseWriter, name, value, onClick, jsForm, nestingForm);
            }
        }

        // target
        String target = ((HtmlCommandLink)component).getTarget();
        if (target != null && target.trim().length() > 0) {
            onClick.append(jsForm);
            onClick.append(".target='");
            onClick.append(target);
            onClick.append("';");
        }
		
		// onSubmit
		onClick.append("if("+jsForm+".onsubmit){"+jsForm+".onsubmit();}");
		
        //submit
        onClick.append(jsForm);
        onClick.append(".submit();return false;");  //return false, so that browser does not handle the click

        writer.startElement(HTML.ANCHOR_ELEM, component);
        writer.writeURIAttribute(HTML.HREF_ATTR, "#", null);
        writer.writeAttribute(HTML.ONCLICK_ATTR, onClick.toString(), null);
    }


    protected void renderNonJavaScriptAnchorStart(FacesContext facesContext,
                                                  ResponseWriter writer,
                                                  UIComponent component,
                                                  String clientId)
        throws IOException
    {
        ViewHandler viewHandler = facesContext.getApplication().getViewHandler();
        String viewId = facesContext.getViewRoot().getViewId();
        String path = viewHandler.getActionURL(facesContext, viewId);

        StringBuffer hrefBuf = new StringBuffer(path);

        //add clientId parameter for decode

        if (path.indexOf('?') == -1)
        {
            hrefBuf.append('?');
        }
        else
        {
            hrefBuf.append('&');
        }
        String hiddenFieldName = HtmlRendererUtils.getHiddenCommandLinkFieldName(HtmlRendererUtils.getFormName(component, facesContext));
        hrefBuf.append(hiddenFieldName);
        hrefBuf.append('=');
        hrefBuf.append(clientId);

        if (component.getChildCount() > 0)
        {
            addChildParametersToHref(component, hrefBuf,
                                     false, //not the first url parameter
                                     writer.getCharacterEncoding());
        }

        StateManager stateManager = facesContext.getApplication().getStateManager();
        if (stateManager.isSavingStateInClient(facesContext))
        {
            hrefBuf.append("&");
            hrefBuf.append(URL_STATE_MARKER);
        }
        String href = facesContext.getExternalContext().encodeActionURL(hrefBuf.toString());
        writer.startElement(HTML.ANCHOR_ELEM, component);
        writer.writeURIAttribute(HTML.HREF_ATTR,
                                 facesContext.getExternalContext().encodeActionURL(href),
                                 null);
    }

    private void addChildParametersToHref(UIComponent linkComponent,
                                          StringBuffer hrefBuf,
                                          boolean firstParameter,
                                          String charEncoding)
            throws IOException
    {
        for (Iterator it = linkComponent.getChildren().iterator(); it.hasNext(); )
        {
            UIComponent child = (UIComponent)it.next();
            if (child instanceof UIParameter)
            {
                String name = ((UIParameter)child).getName();
                Object value = ((UIParameter)child).getValue();

                addParameterToHref(name, value, hrefBuf, firstParameter, charEncoding);
                firstParameter = false;
            }
        }
    }

    protected void renderOutputLinkStart(FacesContext facesContext, UIOutput output)
            throws IOException
    {
        ResponseWriter writer = facesContext.getResponseWriter();

        //calculate href
        String href = RendererUtils.getStringValue(facesContext, output);
        if (output.getChildCount() > 0)
        {
            StringBuffer hrefBuf = new StringBuffer(href);
            addChildParametersToHref(output, hrefBuf,
                                     (href.indexOf('?') == -1), //first url parameter?
                                     writer.getCharacterEncoding());
            href = hrefBuf.toString();
        }
        href = facesContext.getExternalContext().encodeResourceURL(href);    //TODO: or encodeActionURL ?

        //write anchor
        writer.startElement(HTML.ANCHOR_ELEM, output);
        writer.writeAttribute(HTML.ID_ATTR, output.getClientId(facesContext), null);
        writer.writeURIAttribute(HTML.HREF_ATTR, href, null);
        HtmlRendererUtils.renderHTMLAttributes(writer, output, HTML.ANCHOR_PASSTHROUGH_ATTRIBUTES);
        writer.flush();
    }

    private void renderLinkParameter(DummyFormResponseWriter dummyFormResponseWriter,
                                     String name,
                                     Object value,
                                     StringBuffer onClick,
                                     String jsForm,
                                     UIForm nestingForm)
    {
        if (name == null)
        {
            throw new IllegalArgumentException("Unnamed parameter value not allowed within command link.");
        }
        onClick.append(jsForm);
        onClick.append(".elements['").append(name).append("']");
        //UIParameter is no ValueHolder, so no conversion possible
        String strParamValue = value != null ? value.toString() : ""; //TODO: Use Converter?
        onClick.append(".value='").append(strParamValue).append("';");

        if (nestingForm != null)
        {
            //renderHiddenParam(writer, name);
            HtmlFormRendererBase.addHiddenCommandParameter(nestingForm, name);
        }
        else
        {
            dummyFormResponseWriter.addDummyFormParameter(name);
        }
    }

    private static void addParameterToHref(String name, Object value, StringBuffer hrefBuf, boolean firstParameter, String charEncoding)
            throws UnsupportedEncodingException
    {
        if (name == null)
        {
            throw new IllegalArgumentException("Unnamed parameter value not allowed within command link.");
        }

        hrefBuf.append(firstParameter ? '?' : '&');
        hrefBuf.append(URLEncoder.encode(name, charEncoding));
        hrefBuf.append('=');
        if (value != null)
        {
            //UIParameter is no ConvertibleValueHolder, so no conversion possible
            hrefBuf.append(URLEncoder.encode(value.toString(), charEncoding));
        }
    }


    protected void renderLinkEnd(FacesContext facesContext, UIComponent component)
            throws IOException
    {
        ResponseWriter writer = facesContext.getResponseWriter();
        // force separate end tag
        writer.writeText("", null);
        writer.endElement(HTML.ANCHOR_ELEM);
    }


}