egroupware/api/js/jsapi/egw_json.js

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/**
* EGroupware clientside API object
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Andreas Stöckel (as AT stylite.de)
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @version $Id$
*/
/*egw:uses
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vendor.bower-asset.jquery.dist.jquery;
egw_core;
egw_utils;
egw_files;
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egw_debug;
*/
/**
* Module sending json requests
*
* @param {string} _app application name object is instanciated for
* @param {object} _wnd window object is instanciated for
*/
egw.extend('json', egw.MODULE_WND_LOCAL, function(_app, _wnd)
{
"use strict";
/**
* Object which contains all registered handlers for JS responses.
* The handlers are organized per response type in the top level of the
* object, where each response type can have an array of handlers attached
* to it.
*/
var plugins = {};
/**
* Global json handlers are from global modules, not window level
*/
if(typeof egw._global_json_handlers == 'undefined')
{
egw._global_json_handlers = {};
}
var global_plugins = egw._global_json_handlers;
/**
* Internal implementation of the JSON request object.
*
* @param {string} _menuaction
* @param {array} _parameters
* @param {function} _callback
* @param {object} _context
* @param {boolean} _async
* @param {object} _sender
* @param {egw} _egw
*/
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function json_request(_menuaction, _parameters, _callback, _context,
_async, _sender, _egw)
{
// Copy the parameters
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this.url = _egw.ajaxUrl(_menuaction);
// IE JSON-serializes arrays passed in from different window contextx (eg. popups)
// as objects (it looses object-type of array), causing them to be JSON serialized
// as objects and loosing parameters which are undefined
// JSON.strigify([123,undefined]) --> '{"0":123}' instead of '[123,null]'
this.parameters = _parameters ? [].concat(_parameters) : [];
this.async = typeof _async != 'undefined' ? _async : true;
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this.callback = _callback ? _callback : null;
this.context = _context ? _context : null;
this.sender = _sender ? _sender : null;
this.egw = _egw;
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// We currently don't have a request object
this.request = null;
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// Some variables needed for notification about a JS files done loading
this.onLoadFinish = null;
this.jsFiles = 0;
this.jsCount = 0;
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// Function which is currently used to display alerts -- may be replaced by
// some API function.
this.alertHandler = function(_message, _details) {
// we need to use the alert function of the window of the request, not just the main window
(this.egw ? this.egw.window : window).alert(_message);
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if (_details)
{
_egw.debug('info', _message, _details);
}
};
}
/**
* Sends the assembled request to the server
* @param {boolean} [async=false] Overrides async provided in constructor to give an easy way to make simple async requests
* @param {string} method ='POST' allow to eg. use a (cachable) 'GET' request instead of POST
* @param {function} error option error callback(_xmlhttp, _err) used instead our default this.error
*
* @return {jqXHR} jQuery jqXHR request object
*/
json_request.prototype.sendRequest = function(async, method, error)
{
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if(typeof async != "undefined")
{
this.async = async;
}
if (typeof method === 'undefined') method = 'POST';
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// Assemble the complete request
var request_obj = JSON.stringify({
request: {
parameters: this.parameters
}
});
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// Send the request via AJAX using the jquery ajax function
// we need to use jQuery of window of egw object, as otherwise the one from main window is used!
// (causing eg. apply from server with app.$app.method to run in main window instead of popup)
this.request = (this.egw.window?this.egw.window.jQuery:jQuery).ajax({
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url: this.url,
async: this.async,
context: this,
// only POST can send JSON as direct payload, GET can not
data: method === 'GET' ? { json_data: request_obj } : request_obj,
contentType: method === 'GET' ? false : 'application/json',
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dataType: 'json',
type: method,
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success: this.handleResponse,
error: error || this.handleError
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});
return this.request;
};
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/**
* Default error callback displaying error via egw.message
*
* @param {XMLHTTP} _xmlhttp
* @param {string} _err
*/
json_request.prototype.handleError = function(_xmlhttp, _err) {
// Don't error about an abort
if(_err !== 'abort')
{
this.egw.message.call(this.egw,
this.egw.lang('A request to the EGroupware server returned with an error')+
': '+_xmlhttp.statusText+' ('+_xmlhttp.status+")\n\n"+
this.egw.lang('Please reload the EGroupware desktop (F5 / Cmd+r).')+"\n"+
this.egw.lang('If the error persists, contact your administrator for help and ask to check the error-log of the webserver.')+
"\n\nURL: "+this.url+"\n"+
(_xmlhttp.getAllResponseHeaders() ? (_xmlhttp.getAllResponseHeaders().match(/^Date:.*$/mi) ? _xmlhttp.getAllResponseHeaders().match(/^Date:.*$/mi)[0]:''):'')+
// if EGroupware send JSON payload with error, errno show it here too
(_err === 'error' && _xmlhttp.status === 400 && typeof _xmlhttp.responseJSON === 'object' && _xmlhttp.responseJSON.error ?
"\nError: "+_xmlhttp.responseJSON.error+' ('+_xmlhttp.responseJSON.errno+')' : '')
);
this.egw.debug('error', 'Ajax request to', this.url, ' failed: ', _err, _xmlhttp.status, _xmlhttp.statusText, _xmlhttp.responseJSON);
// check of unparsable JSON on server-side, which might be caused by some network problem --> resend max. twice
if (_err === 'error' && _xmlhttp.status === 400 && typeof _xmlhttp.responseJSON === 'object' &&
_xmlhttp.responseJSON.errno && _xmlhttp.responseJSON.error.substr(0, 5) === 'JSON ')
{
// ToDo: resend request max. twice
}
}
};
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json_request.prototype.handleResponse = function(data) {
if (data && typeof data.response != 'undefined')
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{
if (egw.preference('show_generation_time', 'common', false) == "1")
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{
var gen_time_div = jQuery('#divGenTime').length > 0 ? jQuery('#divGenTime')
:jQuery('<div id="divGenTime" class="pageGenTime"><span class="pageTime"></span></div>').appendTo('#egw_fw_footer');
}
// Load files first
var js_files = [];
for (var i = data.response.length - 1; i >= 0; --i)
{
var res = data.response[i];
if(res.type == 'js' && typeof res.data == 'string')
{
js_files.unshift(res.data);
data.response.splice(i,1);
}
}
if(js_files.length > 0)
{
var start_time = (new Date).getTime();
this.egw.includeJS(js_files, function() {
var end_time = (new Date).getTime();
this.handleResponse(data);
if (egw.preference('show_generation_time', 'common', false) == "1")
{
var gen_time_div = jQuery('#divGenTime');
if (!gen_time_div.length) gen_time_div = jQuery('.pageGenTime');
var gen_time_async = jQuery('.asyncIncludeTime').length > 0 ? jQuery('.asyncIncludeTime'):
gen_time_div.append('<span class="asyncIncludeTime"></span>').find('.asyncIncludeTime');
gen_time_async.text(egw.lang('async includes took %1s', (end_time-start_time)/1000));
}
}, this);
return;
}
// Flag for only data response - don't call callback if only data
var only_data = (data.response.length > 0);
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for (var i = 0; i < data.response.length; i++)
{
// Get the response object
var res = data.response[i];
if(typeof res.type == 'string' && res.type != 'data') only_data = false;
// Check whether a plugin for the given type exists
var handlers = [plugins, global_plugins];
for(var handler_idx = 0; handler_idx < handlers.length; handler_idx++)
{
var handler_level = handlers[handler_idx];
if (typeof handler_level[res.type] !== 'undefined')
{
for (var j = 0; j < handler_level[res.type].length; j++) {
try {
// Get a reference to the plugin
var plugin = handler_level[res.type][j];
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if (res.type.match(/et2_load/))
{
if (egw.preference('show_generation_time', 'common', false) == "1")
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{
if (gen_time_div.length > 0)
{
gen_time_div.find('span.pageTime').text(egw.lang("Page was generated in %1 seconds ", data.page_generation_time));
if (data.session_restore_time)
{
var gen_time_session_span = gen_time_div.find('span.session').length > 0 ? gen_time_div.find('span.session'):
gen_time_div.append('<span class="session"></span>').find('.session');
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gen_time_session_span.text(egw.lang("session restore time in %1 seconds ", data.page_generation_time));
}
}
}
}
// Call the plugin callback
plugin.callback.call(
plugin.context ? plugin.context : this.context,
res.type, res, this
);
} catch(e) {
var msg = e.message ? e.message : e + '';
var stack = e.stack ? "\n-- Stack trace --\n" + e.stack : "";
this.egw.debug('error', 'Exception "' + msg + '" while handling JSON response from ' +
this.url + ' [' + JSON.stringify(this.parameters) + '] type "' + res.type +
'", plugin', plugin, 'response', res, stack);
}
}
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}
}
}
// Call request callback, if provided
if(this.callback != null && !only_data)
{
this.callback.call(this.context,res);
}
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}
this.request = null;
};
var json = {
/** The constructor of the egw_json_request class.
*
* @param _menuaction the menuaction function which should be called and
* which handles the actual request. If the menuaction is a full featured
* url, this one will be used instead.
* @param _parameters which should be passed to the menuaction function.
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* @param _async specifies whether the request should be asynchronous or
* not.
* @param _callback specifies the callback function which should be
* called, once the request has been sucessfully executed.
* @param _context is the context which will be used for the callback function
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* @param _sender is a parameter being passed to the _callback function
*/
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json: function(_menuaction, _parameters, _callback, _context, _async,
_sender)
{
return new json_request(_menuaction, _parameters, _callback,
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_context, _async, _sender, this);
},
/**
* Registers a new handler plugin.
*
* @param _callback is the callback function which should be called
* whenever a response is comming from the server.
* @param _context is the context in which the callback function should
* be called. If null is given, the plugin is executed in the context
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* of the request object context.
* @param _type is an optional parameter defaulting to 'global'.
* it describes the response type which this plugin should be
* handling.
* @param {boolean} [_global=false] Register the handler globally or
* locally. Global handlers must stay around, so should be used
* for global modules.
*/
registerJSONPlugin: function(_callback, _context, _type, _global)
{
// _type defaults to 'global'
if (typeof _type === 'undefined')
{
_type = 'global';
}
// _global defaults to false
if (typeof _global === 'undefined')
{
_global = false;
}
var scoped = _global ? global_plugins : plugins;
// Create an array for the given category inside the plugins object
if (typeof scoped[_type] === 'undefined')
{
scoped[_type] = [];
}
// Add the entry
scoped[_type].push({
'callback': _callback,
'context': _context
});
},
/**
* Removes a previously registered plugin.
*
* @param _callback is the callback function which should be called
* whenever a response is comming from the server.
* @param _context is the context in which the callback function should
* be called.
* @param _type is an optional parameter defaulting to 'global'.
* it describes the response type which this plugin should be
* handling.
* @param {boolean} [_global=false] Remove a global or local handler.
*/
unregisterJSONPlugin: function(_callback, _context, _type, _global)
{
// _type defaults to 'global'
if (typeof _type === 'undefined')
{
_type = 'global';
}
// _global defaults to false
if (typeof _global === 'undefined')
{
_global = false;
}
var scoped = _global ? global_plugins : plugins;
if (typeof scoped[_type] !== 'undefined') {
for (var i = 0; i < scoped[_type].length; i++)
{
if (scoped[_type][i].callback == _callback &&
scoped[_type][i].context == _context)
{
scoped[_type].slice(i, 1);
break;
}
}
}
}
};
// Regisert the "alert" plugin
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json.registerJSONPlugin(function(type, res, req) {
//Check whether all needed parameters have been passed and call the alertHandler function
if ((typeof res.data.message != 'undefined') &&
(typeof res.data.details != 'undefined'))
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{
req.alertHandler(
res.data.message,
res.data.details);
return true;
}
throw 'Invalid parameters';
}, null, 'alert');
// Regisert the "message" plugin
json.registerJSONPlugin(function(type, res, req) {
//Check whether all needed parameters have been passed and call the alertHandler function
if ((typeof res.data.message != 'undefined'))
{
req.egw.message(res.data.message, res.data.type);
return true;
}
throw 'Invalid parameters';
}, null, 'message');
// Register the "assign" plugin
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json.registerJSONPlugin(function(type, res, req) {
//Check whether all needed parameters have been passed and call the alertHandler function
if ((typeof res.data.id != 'undefined') &&
(typeof res.data.key != 'undefined') &&
(typeof res.data.value != 'undefined'))
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{
var obj = _wnd.document.getElementById(res.data.id);
if (obj)
{
obj[res.data.key] = res.data.value;
if (res.data.key == "innerHTML")
{
egw_insertJS(res.data.value);
}
return true;
}
return false;
}
throw 'Invalid parameters';
}, null, 'assign');
// Register the "data" plugin
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json.registerJSONPlugin(function(type, res, req) {
//Callback the caller in order to allow him to handle the data
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if (req.callback)
{
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req.callback.call(req.sender, res.data);
return true;
}
}, null, 'data');
// Register the "script" plugin
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json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data == 'string')
{
try
{
var func = new Function(res.data);
func.call(req.egw ? req.egw.window : window);
}
catch (e)
{
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req.egw.debug('error', 'Error while executing script: ',
res.data,e);
}
return true;
}
throw 'Invalid parameters';
}, null, 'script');
// Register the "apply" plugin
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json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data.func == 'string')
{
var parts = res.data.func.split('.');
var func = parts.pop();
var parent = req.egw.window;
for(var i=0; i < parts.length; ++i)
{
if (typeof parent[parts[i]] != 'undefined')
{
parent = parent[parts[i]];
}
// check if we need a not yet instanciated app.js object --> instanciate it now
else if (i == 1 && parts[0] == 'app' && typeof req.egw.window.app.classes[parts[1]] == 'function')
{
parent = parent[parts[1]] = new req.egw.window.app.classes[parts[1]]();
}
}
if (typeof parent[func] == 'function')
{
try
{
parent[func].apply(parent, res.data.parms);
}
catch (e)
{
req.egw.debug('error', e.message, ' in function', res.data.func,
'Parameters', res.data.parms);
}
return true;
}
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else
{
throw '"' + res.data.func + '" is not a callable function (type is ' + typeof parent[func] + ')';
}
}
throw 'Invalid parameters';
}, null, 'apply');
// Register the "jquery" plugin
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json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data.select == 'string' &&
typeof res.data.func == 'string')
{
try
{
var jQueryObject = jQuery(res.data.select, req.context);
jQueryObject[res.data.func].apply(jQueryObject, res.data.parms);
}
catch (e)
{
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req.egw.debug('error', 'Function', res.data.func,
'Parameters', res.data.parms);
}
return true;
}
throw 'Invalid parameters';
}, _wnd, 'jquery');
// Register the "redirect" plugin
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json.registerJSONPlugin(function(type, res, req) {
//console.log(res.data.url);
if (typeof res.data.url == 'string' &&
typeof res.data.global == 'boolean')
{
//Special handling for framework reload
res.data.global |= (res.data.url.indexOf("?cd=10") > 0);
if (res.data.global)
{
egw_topWindow().location.href = res.data.url;
}
// json request was originating from a different popup --> redirect that one
else if(this && this.DOMContainer && this.DOMContainer.ownerDocument.defaultView != window &&
egw(this.DOMContainer.ownerDocument.defaultView).is_popup())
{
this.DOMContainer.ownerDocument.location.href = res.data.url;
}
// main window, open url in respective tab
else
{
egw_appWindowOpen(res.data.app, res.data.url);
}
return true;
}
throw 'Invalid parameters';
}, null, 'redirect');
// Register the 'css' plugin
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json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data == 'string')
{
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req.egw.includeCSS(res.data);
return true;
}
throw 'Invalid parameters';
}, null, 'css');
// Register the 'js' plugin
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json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data == 'string')
{
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req.jsCount++;
req.egw.includeJS(res.data, function() {
req.jsFiles++;
if (req.jsFiles == req.jsCount && req.onLoadFinish)
{
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req.onLoadFinish.call(req.sender);
}
});
return true;
}
throw 'Invalid parameters';
}, null, 'js');
// Register the 'html' plugin, replacing document content with send html
json.registerJSONPlugin(function(type, res, req) {
if (typeof res.data == 'string')
{
// Empty the document tree
while (_wnd.document.childNodes.length > 0)
{
_wnd.document.removeChild(_wnd.document.childNodes[0]);
}
// Write the given content
_wnd.document.write(res.data);
// Close the document
_wnd.document.close();
return true;
}
throw 'Invalid parameters';
}, null, 'html');
// Return the extension
return json;
});