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Struts example source code file (utils.js)

This example Struts source code file (utils.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

strutsutils, strutsutils

The Struts utils.js source code

/*
 * $Id: utils.js 1079950 2011-03-09 19:19:33Z jogep $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

var StrutsUtils = {};

// gets an object with validation errors from string returned by 
// the ajaxValidation interceptor
StrutsUtils.getValidationErrors = function(data) {
  if(data.indexOf("/* {") === 0) {
    return eval("( " + data.substring(2, data.length - 2) + " )");
  } else {
    return null;
  }  
};

StrutsUtils.clearValidationErrors = function(form) {
    var firstNode = StrutsUtils.firstElement(form);
    var xhtml = firstNode.tagName.toLowerCase() === "table";

    if(xhtml) {
        clearErrorMessagesXHTML(form);
        clearErrorLabelsXHTML(form);
    } else {
        clearErrorMessagesCSS(form);
        clearErrorLabelsCSS(form);
    }

    //clear previous global error messages
	if(StrutsUtils.errorLists[form] && StrutsUtils.errorLists[form] !== null) {
		form.parentNode.removeChild(StrutsUtils.errorLists[form]);
		StrutsUtils.errorLists[form] = null;
	}

};

StrutsUtils.errorLists = [];

// shows validation errors using functions from xhtml/validation.js
// or css_xhtml/validation.js
StrutsUtils.showValidationErrors = function(form, errors) {
    StrutsUtils.clearValidationErrors(form, errors);

	if (errors.errors) {
		var l, errorList = document.createElement("ul");

		errorList.setAttribute("class", "errorMessage");
		errorList.setAttribute("className", "errorMessage"); // ie hack cause ie does not support setAttribute

		for ( l = 0; l < errors.errors.length; l++) {
			var item = document.createElement("li");
			var itemText = document.createTextNode(errors.errors[l]);
			item.appendChild(itemText);

			errorList.appendChild(item);
		}
		
		form.parentNode.insertBefore(errorList, form);
		StrutsUtils.errorLists[form] = errorList;
	}

  var i, fieldName, firstNode = StrutsUtils.firstElement(form);
  var xhtml = firstNode.tagName.toLowerCase() === "table";
  if(errors.fieldErrors) {
    for(fieldName in errors.fieldErrors) {
      if(errors.fieldErrors.hasOwnProperty(fieldName)) {
        for(i = 0; i < errors.fieldErrors[fieldName].length; i++) {
          if(xhtml) {
            addErrorXHTML(form.elements[fieldName], errors.fieldErrors[fieldName][i]);
          } else {
            addErrorCSS(form.elements[fieldName], errors.fieldErrors[fieldName][i]);
          }
        }
      }
    }
  }
};

StrutsUtils.firstElement  = function(parentNode, tagName) {
  var node = parentNode.firstChild;
  while(node && node.nodeType !== 1){
    node = node.nextSibling;
  }
  if(tagName && node && node.tagName && node.tagName.toLowerCase() !== tagName.toLowerCase()) {
    node = StrutsUtils.nextElement(node, tagName);
  }
  return node;  
};

StrutsUtils.nextElement = function(node, tagName) {
  if(!node) { return null; }
  do {
    node = node.nextSibling;
  } while(node && node.nodeType !== 1);

  if(node && tagName && tagName.toLowerCase() !== node.tagName.toLowerCase()) {
    return StrutsUtils.nextElement(node, tagName);
  }
  return node;  
};

StrutsUtils.previousElement = function(node, tagName) {
  if(!node) { return null; }
  if(tagName) { tagName = tagName.toLowerCase(); }
  do {
    node = node.previousSibling;
  } while(node && node.nodeType !== 1);
  
  if(node && tagName && tagName.toLowerCase() !== node.tagName.toLowerCase()) {
    return StrutsUtils.previousElement(node, tagName);
  }
  return node;  
};

StrutsUtils.addOnLoad = function(func) {
  var oldonload = window.onload;
  if (typeof window.onload !== 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    };
  }
};

StrutsUtils.addEventListener = function(element, name, observer, capture) {
  if (element.addEventListener) {
    element.addEventListener(name, observer, false);
  } else if (element.attachEvent) {
    element.attachEvent('on' + name, observer);
  }
};

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