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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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47 | 0 | public class FormLinkRenderer extends DefaultLinkRenderer |
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{ |
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56 | 0 | 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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{ |
61 | 0 | IMarkupWriter wrappedWriter = null; |
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|
63 | 0 | if (cycle.getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME) != null) |
64 | 0 | throw new ApplicationRuntimeException(Tapestry.getMessage("AbstractLinkComponent.no-nesting"), |
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linkComponent, null, null); |
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67 | 0 | cycle.setAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME, |
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linkComponent); |
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70 | 0 | String formName = cycle.getUniqueId("LinkForm"); |
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72 | 0 | boolean hasBody = getHasBody(); |
73 | 0 | boolean disabled = linkComponent.isDisabled(); |
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75 | 0 | if (!disabled && !cycle.isRewinding()) |
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{ |
77 | 0 | ILink l = linkComponent.getLink(cycle); |
78 | 0 | String anchor = linkComponent.getAnchor(); |
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80 | 0 | PageRenderSupport prs = TapestryUtils.getPageRenderSupport(cycle, linkComponent); |
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82 | 0 | String function = generateFormFunction(formName, l, anchor); |
83 | 0 | prs.addBodyScript(linkComponent, function); |
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85 | 0 | if (hasBody) |
86 | 0 | writer.begin(getElement()); |
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else |
88 | 0 | writer.beginEmpty(getElement()); |
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90 | 0 | writer.attribute(getUrlAttribute(), "javascript: document." |
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+ formName + ".submit();"); |
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93 | 0 | beforeBodyRender(writer, cycle, linkComponent); |
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99 | 0 | wrappedWriter = writer.getNestedWriter(); |
100 | 0 | } |
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else |
102 | 0 | wrappedWriter = writer; |
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104 | 0 | if (hasBody) |
105 | 0 | linkComponent.renderBody(wrappedWriter, cycle); |
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107 | 0 | if (!disabled && !cycle.isRewinding()) |
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{ |
109 | 0 | afterBodyRender(writer, cycle, linkComponent); |
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111 | 0 | linkComponent.renderAdditionalAttributes(writer, cycle); |
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113 | 0 | if (hasBody) |
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{ |
115 | 0 | wrappedWriter.close(); |
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119 | 0 | writer.end(); |
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} |
121 | 0 | else writer.closeTag(); |
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} |
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124 | 0 | cycle.removeAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME); |
125 | 0 | } |
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private String generateFormFunction(String formName, ILink link, |
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String anchor) |
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{ |
130 | 0 | String[] parameterNames = link.getParameterNames(); |
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132 | 0 | StringBuffer buf = new StringBuffer(); |
133 | 0 | buf.append("function prepare" + formName + "() {\n"); |
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135 | 0 | buf.append(" var html = \"\";\n"); |
136 | 0 | buf.append(" html += \"<div style='position: absolute'>\";\n"); |
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138 | 0 | String url = link.getURL(anchor, false); |
139 | 0 | buf.append(" html += \"<form name='" + formName |
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+ "' method='post' action='" + url + "'>\";\n"); |
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142 | 0 | for(int i = 0; i < parameterNames.length; i++) |
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{ |
144 | 0 | String parameter = parameterNames[i]; |
145 | 0 | String[] values = link.getParameterValues(parameter); |
146 | 0 | if (values != null) { |
147 | 0 | for (int j = 0; j < values.length; j++) { |
148 | 0 | String value = values[j]; |
149 | 0 | buf.append(" html += \"<input type='hidden' name='" + parameter + "' value='" + value + "'/>\";\n"); |
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} |
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} |
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} |
153 | 0 | buf.append(" html += \"<\" + \"/form>\";\n"); |
154 | 0 | buf.append(" html += \"<\" + \"/div>\";\n"); |
155 | 0 | buf.append(" document.write(html);\n"); |
156 | 0 | buf.append("}\n"); |
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158 | 0 | buf.append("prepare" + formName + "();\n\n"); |
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160 | 0 | return buf.toString(); |
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} |
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} |