It's old code, but it works.
October 14, 2003
A simple adaption of the Struts Validator tag to extract the javascript code It's old code, but it works.
Any comments are welcome on the Velocity Developer's List <velocity-dev@jakarta.apache.org>.
Marinó A. Jónsson
–
here's an updated and cleaned up version: VelocityToolsValidatorTool
i don't have any apps set up with VelocityStruts + Validator right now that i can test this on. so, if someone would be willing to make sure i didn't screw things up, i'd appreciate it.
Nathan Bubna
{ { {
/*
{{{ * The Apache Software License, Version 1.1
*
* Copyright (c) 2003 The Apache Software Foundation. All rights
* reserved.
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* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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*
* 2. Redistributions in binary form must reproduce the above copyright
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* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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package org.apache.velocity.tools.struts;
import org.apache.commons.validator.Field; import org.apache.commons.validator.Form; import org.apache.commons.validator.ValidatorAction; import org.apache.commons.validator.ValidatorResources; import org.apache.commons.validator.ValidatorUtil; import org.apache.commons.validator.Var; import org.apache.struts.Globals; import org.apache.struts.config.ModuleConfig; import org.apache.struts.util.MessageResources; import org.apache.struts.util.RequestUtils; import org.apache.struts.validator.Resources; import org.apache.struts.validator.ValidatorPlugIn;
import org.apache.velocity.tools.view.context.ViewContext; import org.apache.velocity.context.Context; import org.apache.velocity.tools.view.tools.ViewTool;
import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import java.util.*;
/**
* <p>Title: ValidatorTool</p>
* <p>Description: View tool to work with the Struts Validator to produce client side javascript validation.</p>
* <p>Usage:
*
* Template example:
*
* <!-- javascript form validation -->
* #set ($foo = $validator.setFormName("nameofyourform"))
* $validator.javascript <-- spits out the dynamic javascript
*
* or simply
*
* $validator.javascript("nameOfYourForm")
*
*
* Toolbox configuration:
*
* <tool>
* <key>validator</key>
* <scope>request</scope>
* <class>package org.apache.velocity.tools.struts.ValidatorTool</class>
* </tool>
*
* <p>This is a quick copy/paste of the JavascriptValidator Tag
* from the Struts 1.1 validator library</p>
*
* @author <a href="mailto:marinoj@centrum.is">Marino A. Jonsson</a>
* @version $Revision: 1.1 $ $Date: 2003/07/24 04:59:21 $
*/ |
public class ValidatorTool implements ViewTool {
// --------------------------------------------- Properties ---------------
/**
* A reference to the ViewContext
*/
protected ViewContext context;
/**
* A reference to the ServletContext
*/
protected ServletContext app;
/**
* A reference to the HttpServletRequest.
*/
protected HttpServletRequest request;
/**
* A reference to the HttpSession.
*/
protected HttpSession session;
/**
* A reference to the Struts message resources.
*/
protected MessageResources resources;
/**
* The servlet context attribute key for our resources.
*/
protected String bundle = Globals.MESSAGES_KEY;
/**
* The name of the form that corresponds with the action name
* in struts-config.xml. Specifying a form name places a
* <script> </script> around the javascript.
*/
protected String formName = null;
/**
* The line ending string.
*/
protected static String lineEnd = System.getProperty("line.separator");
/**
* The current page number of a multi-part form.
* Only valid when the formName attribute is set.
*/
protected int page = 0;
/**
* This will be used as is for the JavaScript validation method name if it has a value. This is
* the method name of the main JavaScript method that the form calls to perform validations.
*/
protected String methodName = null;
/**
* The static JavaScript methods will only be printed if this is set to "true".
*/
protected String staticJavascript = "true";
/**
* The dynamic JavaScript objects will only be generated if this is set to "true".
*/
protected String dynamicJavascript = "true";
/**
* The src attribute for html script element (used to include an external script
* resource). The src attribute is only recognized
* when the formName attribute is specified.
*/
protected String src = null;
/**
* The JavaScript methods will enclosed with html comments if this is set to "true".
*/
protected String htmlComment = "true";
/**
* Hide JavaScript methods in a CDATA section for XHTML when "true".
*/
protected String cdata = "true";
private String htmlBeginComment = "\n<!-- Begin \n";
private String htmlEndComment = "//End --> \n";
private boolean xhtml = false;
// --------------------------------------------- Constructors -------------
/**
* Default constructor. Tool must be initialized before use.
*/
public ValidatorTool() {
}
/**
* Initializes this tool.
*
* @param obj the current ViewContext
* @throws IllegalArgumentException if the param is not a ViewContext
*/
public void init(Object obj) {
if (!(obj instanceof ViewContext)) {
throw new IllegalArgumentException("Tool can only be initialized with a ViewContext");
}
this.context = (ViewContext) obj;
this.request = context.getRequest();
this.session = request.getSession(false);
this.app = context.getServletContext();
Boolean b = (Boolean)context.getAttribute(ViewContext.XHTML);
if (b != null)
{
xhtml = b.booleanValue();
}
}
// --------------------------------------------- View Helpers -------------
/**
* Gets the key (form name) that will be used
* to retrieve a set of validation rules to be
* performed on the bean passed in for validation.
*/
public String getFormName() {
return formName;
}
/**
* Sets the key (form name) that will be used
* to retrieve a set of validation rules to be
* performed on the bean passed in for validation.
* Specifying a form name places a
* <script> </script> tag around the javascript.
*/
public void setFormName(String formName) {
this.formName = formName;
}
/**
* Gets the current page number of a multi-part form.
* Only field validations with a matching page numer
* will be generated that match the current page number.
* Only valid when the formName attribute is set.
*/
public int getPage() {
return page;
}
/**
* Sets the current page number of a multi-part form.
* Only field validations with a matching page numer
* will be generated that match the current page number.
* Only valid when the formName attribute is set.
*/
public void setPage(int page) {
this.page = page;
}
/**
* Gets the method name that will be used for the Javascript
* validation method name if it has a value. This overrides
* the auto-generated method name based on the key (form name)
* passed in.
*/
public String getMethod() {
return methodName;
}
/**
* Sets the method name that will be used for the Javascript
* validation method name if it has a value. This overrides
* the auto-generated method name based on the key (form name)
* passed in.
*/
public void setMethod(String methodName) {
this.methodName = methodName;
}
/**
* Gets whether or not to generate the static
* JavaScript. If this is set to 'true', which
* is the default, the static JavaScript will be generated.
*/
public String getStaticJavascript() {
return staticJavascript;
}
/**
* Sets whether or not to generate the static
* JavaScript. If this is set to 'true', which
* is the default, the static JavaScript will be generated.
*/
public void setStaticJavascript(String staticJavascript) {
this.staticJavascript = staticJavascript;
}
/**
* Gets whether or not to generate the dynamic
* JavaScript. If this is set to 'true', which
* is the default, the dynamic JavaScript will be generated.
*/
public String getDynamicJavascript() {
return dynamicJavascript;
}
/**
* Sets whether or not to generate the dynamic
* JavaScript. If this is set to 'true', which
* is the default, the dynamic JavaScript will be generated.
*/
public void setDynamicJavascript(String dynamicJavascript) {
this.dynamicJavascript = dynamicJavascript;
}
/**
* Gets whether or not to delimit the
* JavaScript with html comments. If this is set to 'true', which
* is the default, the htmlComment will be surround the JavaScript.
*/
public String getHtmlComment() {
return htmlComment;
}
/**
* Sets whether or not to delimit the
* JavaScript with html comments. If this is set to 'true', which
* is the default, the htmlComment will be surround the JavaScript.
*/
public void setHtmlComment(String htmlComment) {
this.htmlComment = htmlComment;
}
/**
* Gets the src attribute's value when defining
* the html script element.
*/
public String getSrc() {
return src;
}
/**
* Sets the src attribute's value when defining
* the html script element. The src attribute is only recognized
* when the formName attribute is specified.
*/
public void setSrc(String src) {
this.src = src;
}
/**
* Render the JavaScript for to perform validations based on the form name.
*
* @exception javax.servlet.jsp.JspException if a JSP exception has occurred
*/
public String getJavascript(String formName) throws Exception {
this.formName = formName;
StringBuffer results = new StringBuffer();
ModuleConfig config = RequestUtils.getModuleConfig(request, app);
ValidatorResources resources = (ValidatorResources) app.getAttribute(
ValidatorPlugIn.VALIDATOR_KEY + config.getPrefix());
Locale locale = StrutsUtils.getLocale(request, session);
Form form = resources.get(locale, formName);
if (form != null) {
if("true".equals(dynamicJavascript)) {
MessageResources messages = StrutsUtils.getMessageResources(request, app);
List lActions = new ArrayList();
List lActionMethods = new ArrayList();
// Get List of actions for this Form
for (Iterator i = form.getFields().iterator(); i.hasNext();) {
Field field = (Field) i.next();
for (Iterator x = field.getDependencies().iterator(); x.hasNext();) {
Object o = x.next();
if (o != null && !lActionMethods.contains(o))
lActionMethods.add(o);
}
}
// Create list of ValidatorActions based on lActionMethods
for (Iterator i = lActionMethods.iterator(); i.hasNext();) {
String depends = (String) i.next();
ValidatorAction va = resources.getValidatorAction(depends);
// throw nicer NPE for easier debugging
if (va == null) {
throw new NullPointerException(
"Depends string \''''''
+ depends
+ "\" was not found in validator-rules.xml.");
}
String javascript = va.getJavascript();
if (javascript != null && javascript.length() > 0)
lActions.add(va);
else
i.remove();
}
Collections.sort(lActions, new Comparator() {
public int compare(Object o1, Object o2) {
ValidatorAction va1 = (ValidatorAction) o1;
ValidatorAction va2 = (ValidatorAction) o2;
if ((va1.getDepends() == null || va1.getDepends().length() == 0)
&& (va2.getDepends() == null || va2.getDepends().length() == 0)) {
return 0;
} else if (
(va1.getDepends() != null && va1.getDepends().length() > 0)
&& (va2.getDepends() == null || va2.getDepends().length() == 0)) {
return 1;
} else if (
(va1.getDepends() == null || va1.getDepends().length() == 0)
&& (va2.getDepends() != null && va2.getDepends().length() > 0)) {
return -1;
} else {
return va1.getDependencies().size() - va2.getDependencies().size();
}
}
});
String methods = null;
for (Iterator i = lActions.iterator(); i.hasNext();) {
ValidatorAction va = (ValidatorAction) i.next();
if (methods == null) {
methods = va.getMethod() + "(form)";
} else {
methods += " && " + va.getMethod() + "(form)";
}
}
results.append(getJavascriptBegin(methods));
for (Iterator i = lActions.iterator(); i.hasNext();) {
ValidatorAction va = (ValidatorAction) i.next();
String jscriptVar = null;
String functionName = null;
if (va.getJsFunctionName() != null && va.getJsFunctionName().length() > 0) {
functionName = va.getJsFunctionName();
} else {
functionName = va.getName();
}
results.append(" function " + functionName + " () { \n");
for (Iterator x = form.getFields().iterator(); x.hasNext();) {
Field field = (Field) x.next();
// Skip indexed fields for now until there is a good way to handle
// error messages (and the length of the list (could retrieve from scope?))
if (field.isIndexed()
|| field.getPage() != page
|| !field.isDependency(va.getName())) {
continue;
}
String message =
Resources.getMessage(messages, locale, va, field);
message = (message != null) ? message : '''''';
jscriptVar = this.getNextVar(jscriptVar);
results.append(
" this."
+ jscriptVar
+ " = new Array(\''''''
+ field.getKey()
+ "\", \''''''
+ message
+ "\", ");
results.append("new Function (\"varName\", \'''''');
Map vars = field.getVars();
// Loop through the field's variables.
Iterator varsIterator = vars.entrySet().iterator();
while (varsIterator.hasNext()) {
Map.Entry entry = (Map.Entry) varsIterator.next();
String varName = (String) entry.getKey();
Var var = (Var) entry.getValue();
String varValue = var.getValue();
String jsType = var.getJsType();
// skip requiredif variables field, fieldIndexed, fieldTest, fieldValue
if (varName.startsWith("field")) {
continue;
}
if (Var.JSTYPE_INT.equalsIgnoreCase(jsType)) {
results.append(
"this."
+ varName
+ "="
+ ValidatorUtil.replace(
varValue,
"\\",
"\\\\")
+ "; ");
} else if (Var.JSTYPE_REGEXP.equalsIgnoreCase(jsType)) {
results.append(
"this."
+ varName
+ "=/"
+ ValidatorUtil.replace(
varValue,
"\\",
"\\\\")
+ "/; ");
} else if (Var.JSTYPE_STRING.equalsIgnoreCase(jsType)) {
results.append(
"this."
+ varName
+ "='"
+ ValidatorUtil.replace(
varValue,
"\\",
"\\\\")
+ "'; ");
// So everyone using the latest format doesn't need to change their xml files immediately.
} else if ("mask".equalsIgnoreCase(varName)) {
results.append(
"this."
+ varName
+ "=/"
+ ValidatorUtil.replace(
varValue,
"\\",
"\\\\")
+ "/; ");
} else {
results.append(
"this."
+ varName
+ "='"
+ ValidatorUtil.replace(
varValue,
"\\",
"\\\\")
+ "'; ");
}
}
results.append(" return this[varName];\"));\n");
}
results.append(" } \n\n");
}
} else if ("true".equalsIgnoreCase(staticJavascript)) {
results.append(this.getStartElement());
if ("true".equalsIgnoreCase(htmlComment)) {
results.append(htmlBeginComment);
}
}
}
if ("true".equalsIgnoreCase(staticJavascript)) {
results.append(getJavascriptStaticMethods(resources));
}
if (form != null
&& ("true".equalsIgnoreCase(dynamicJavascript)
|| "true".equalsIgnoreCase(staticJavascript))) {
results.append(getJavascriptEnd());
}
return results.toString();
}
/**
* Returns the opening script element and some initial javascript.
*/
protected String getJavascriptBegin(String methods) {
StringBuffer sb = new StringBuffer();
String name =
formName.substring(0, 1).toUpperCase()
+ formName.substring(1);
sb.append(this.getStartElement());
if (this.xhtml && "true".equalsIgnoreCase(this.cdata)) {
sb.append("<![CDATA[\r\n");
}
if (!this.xhtml && "true".equals(htmlComment)) {
sb.append(htmlBeginComment);
}
sb.append("\n var bCancel = false; \n\n");
if (methodName == null || methodName.length() == 0) {
sb.append(
" function validate"
+ name
+ "(form) { \n");
} else {
sb.append(
" function "
+ methodName
+ "(form) { \n");
}
sb.append(" if (bCancel) \n");
sb.append(" return true; \n");
sb.append(" else \n");
// Always return true if there aren't any Javascript validation methods
if (methods == null || methods.length() == 0) {
sb.append(" return true; \n");
} else {
sb.append(" return " + methods + "; \n");
}
sb.append(" } \n\n");
return sb.toString();
}
protected String getJavascriptStaticMethods(ValidatorResources resources) {
StringBuffer sb = new StringBuffer();
sb.append("\n\n");
Iterator actions = resources.getValidatorActions().values().iterator();
while (actions.hasNext()) {
ValidatorAction va = (ValidatorAction) actions.next();
if (va != null) {
String javascript = va.getJavascript();
if (javascript != null && javascript.length() > 0) {
sb.append(javascript + "\n");
}
}
}
return sb.toString();
}
/**
* Returns the closing script element.
*/
protected String getJavascriptEnd() {
StringBuffer sb = new StringBuffer();
sb.append("\n");
if (!this.xhtml && "true".equals(htmlComment)){
sb.append(htmlEndComment);
}
if (this.xhtml && "true".equalsIgnoreCase(this.cdata)) {
sb.append("]]>\r\n");
}
sb.append("</script>\n\n");
return sb.toString();
}
/**
* The value <code>null</code> will be returned at the end of the sequence.
* ex: "zz" will return <code>null</code>
*/
private String getNextVar(String input) {
if (input == null) {
return "aa";
}
input = input.toLowerCase();
for (int i = input.length(); i > 0; i--) {
int pos = i - 1;
char c = input.charAt(pos);
c++;
if (c <= 'z') {
if (i == 0) {
return c + input.substring(pos);
} else if (i == input.length()) {
return input.substring(0, pos) + c;
} else {
return input.substring(0, pos) + c + input.substring(pos, input.length() - 1);
}
} else {
input = replaceChar(input, pos, 'a');
}
}
return null;
}
/**
* Replaces a single character in a <code>String</code>
*/
private String replaceChar(String input, int pos, char c) {
if (pos == 0) {
return c + input.substring(pos);
} else if (pos == input.length()) {
return input.substring(0, pos) + c;
} else {
return input.substring(0, pos) + c + input.substring(pos, input.length() - 1);
}
}
/**
* Constructs the beginning <script> element depending on xhtml status.
*/
private String getStartElement() {
StringBuffer start = new StringBuffer("<script type=\"text/javascript\'''''');
// there is no language attribute in xhtml
if (!this.xhtml) {
start.append(" language=\"Javascript1.1\'''''');
}
if (this.src != null) {
start.append(" src=\'''''' + src + "\'''''');
}
start.append("> \n");
return start.toString();
}
/**
* Returns the cdata setting "true" or "false".
* @return String - "true" if JavaScript will be hidden in a CDATA section
*/
public String getCdata() {
return cdata;
}
/**
* Sets the cdata status.
* @param cdata The cdata to set
*/
public void setCdata(String cdata) {
this.cdata = cdata;
} |
}
} } } |