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package org.apache.tapestry.contrib.link; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.tapestry.*; |
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import org.apache.tapestry.components.ILinkComponent; |
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import org.apache.tapestry.engine.ILink; |
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import org.apache.tapestry.link.DefaultLinkRenderer; |
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import org.apache.tapestry.link.ILinkRenderer; |
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public class FormLinkRenderer extends DefaultLinkRenderer |
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{ |
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public static final ILinkRenderer RENDERER = new FormLinkRenderer(); |
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public void renderLink(IMarkupWriter writer, IRequestCycle cycle, |
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ILinkComponent linkComponent) |
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{ |
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IMarkupWriter wrappedWriter = null; |
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if (cycle.getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME) != null) |
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throw new ApplicationRuntimeException(Tapestry.getMessage("AbstractLinkComponent.no-nesting"), |
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linkComponent, null, null); |
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cycle.setAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME, |
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linkComponent); |
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String formName = cycle.getUniqueId("LinkForm"); |
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boolean hasBody = getHasBody(); |
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boolean disabled = linkComponent.isDisabled(); |
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if (!disabled && !cycle.isRewinding()) |
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{ |
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ILink l = linkComponent.getLink(cycle); |
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String anchor = linkComponent.getAnchor(); |
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PageRenderSupport prs = TapestryUtils.getPageRenderSupport(cycle, linkComponent); |
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String function = generateFormFunction(formName, l, anchor); |
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prs.addBodyScript(linkComponent, function); |
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if (hasBody) |
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writer.begin(getElement()); |
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else |
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writer.beginEmpty(getElement()); |
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writer.attribute(getUrlAttribute(), "javascript: document." |
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+ formName + ".submit();"); |
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beforeBodyRender(writer, cycle, linkComponent); |
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wrappedWriter = writer.getNestedWriter(); |
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} |
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else |
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wrappedWriter = writer; |
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if (hasBody) |
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linkComponent.renderBody(wrappedWriter, cycle); |
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if (!disabled && !cycle.isRewinding()) |
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{ |
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afterBodyRender(writer, cycle, linkComponent); |
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linkComponent.renderAdditionalAttributes(writer, cycle); |
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if (hasBody) |
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{ |
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wrappedWriter.close(); |
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writer.end(); |
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} |
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else writer.closeTag(); |
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} |
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cycle.removeAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME); |
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} |
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private String generateFormFunction(String formName, ILink link, |
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String anchor) |
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{ |
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String[] parameterNames = link.getParameterNames(); |
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StringBuffer buf = new StringBuffer(); |
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buf.append("function prepare" + formName + "() {\n"); |
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buf.append(" var html = \"\";\n"); |
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buf.append(" html += \"<div style='position: absolute'>\";\n"); |
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String url = link.getURL(anchor, false); |
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buf.append(" html += \"<form name='" + formName |
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+ "' method='post' action='" + url + "'>\";\n"); |
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for(int i = 0; i < parameterNames.length; i++) |
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{ |
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String parameter = parameterNames[i]; |
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String[] values = link.getParameterValues(parameter); |
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if (values != null) { |
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for (int j = 0; j < values.length; j++) { |
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String value = values[j]; |
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buf.append(" html += \"<input type='hidden' name='" + parameter + "' value='" + value + "'/>\";\n"); |
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} |
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} |
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} |
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buf.append(" html += \"<\" + \"/form>\";\n"); |
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buf.append(" html += \"<\" + \"/div>\";\n"); |
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buf.append(" document.write(html);\n"); |
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buf.append("}\n"); |
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buf.append("prepare" + formName + "();\n\n"); |
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return buf.toString(); |
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} |
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} |