org.directwebremoting.webwork.DWRActionUtil.js Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker / Alexandru Popescu
 *
 * Licensed 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.
 */

/**
 * Declare an object to which we can add real functions.
 */
if (dwr == null) var dwr = {};
if (dwr.webwork == null) dwr.webwork = {};
if (DWRActionUtil == null) var DWRActionUtil = dwr.webwork;

/** Execute a remote request using DWR */
dwr.webwork.execute = function(action, values, callbackObjOrName) {
  var params = {};
  if (dwr.webwork.isElement(values)) {
    var element = $(values);
    var elementName= element.nodeName.toLowerCase();
    if (elementName == 'form') {
      for (var i = 0; i < element.elements.length; i=i+1) {
        var e = element.elements[i];
        if (e.name != null && e.name != '') params[e.name] = dwr.util.getValue(e);
      }
    }
    else {
      params[element.name] = dwr.util.getValue(element);
    }
  }
  else {
    for (var prop in values) {
      params[prop]= values[prop];
    }
  }

  // prepare action invocation object
  var actionObj = {};
  if (typeof action == 'string') {
    var lastIdx= action.lastIndexOf('/');
    actionObj.executeResult = 'true';
    if (lastIdx != -1) {
      actionObj.namespace = action.substring(0, lastIdx);
      actionObj.action = action.substring(lastIdx + 1);
    }
    else {
      actionObj.namespace= '';
      actionObj.action = action;
    }
  }
  else {
    actionObj= action;
  }

  // prepare the DWR callback object
  var callbackObj = {};
  var mustCall= false;
  if (typeof callbackObjOrName == 'string') {
    callbackObj.callback = function(dt) { dwr.webwork.callback(dt, eval(callbackObjOrName)); };
    mustCall= true;
  }
  else if (typeof callbackObjOrName == 'function') {
    callbackObj.callback = function(dt) { dwr.webwork.callback(dt, callbackObjOrName); };
    mustCall= true;
  } 
  else if (typeof callbackObjOrName == 'object' && typeof callbackObjOrName.callback == 'function') {
    for (var prop in callbackObjOrName) {
      callbackObj[prop] = callbackObjOrName[prop];
    }
    callbackObj.callback = function(dt) { dwr.webwork.callback(dt, callbackObjOrName.callback); };
    mustCall= true;
  }
  if (mustCall) {
    dwr.webwork.execute(actionObj, params, callbackObj);
  }
};

/** Execute a remote request using DWR */
dwr.webwork.callback = function(dt, originalCallback) {
  if (dt.data) originalCallback(dt.data);
  else if (dt.text) originalCallback(dt.text);
  else originalCallback(dt);
};

/** Utility to check to see if the passed object is an input element / element id */
dwr.webwork.isElement = function(elementOrId) {
  if (typeof elementOrId == "string") {
    return true;
  }
  if (elementOrId.nodeName) {
    var name= elementOrId.nodeName.toLowerCase();
    if (name == 'input' || name == 'form') {
      return true;
    }
  }

  return false;
};