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October 14, 2003

A simple adaption of the Struts Validator tag to extract the javascript code (smile) 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. 
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    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. 
 * 
 * 4. The names "The Jakarta Project", "Velocity", and "Apache Software 
 *    Foundation" must not be used to endorse or promote products derived 
 *    from this software without prior written permission. For written 
 *    permission, please contact apache@apache.org. 
 * 
 * 5. Products derived from this software may not be called "Apache" 
 *    nor may "Apache" appear in their names without prior written 
 *    permission of the Apache Group. 
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 * ==================================================================== 
 * 
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Apache Software Foundation.  For more 
 * information on the Apache Software Foundation, please see 
 * <http://www.apache.org/>. 
 */ 

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 
     * &lt;script&gt; &lt;/script&gt; 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 
     * &lt;script&gt; &lt;/script&gt; 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. 
      * &nbsp;&nbsp;&nbsp; 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 &lt;script&gt; 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; 
    } 

}

 } } } 
 
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