104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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*/
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// OSRM JSONP call wrapper
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// [wrapper for JSONP calls with DOM cleaning, fencing, timout handling]
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OSRM.JSONP = {
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// storage to keep track of unfinished JSONP calls
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fences: {},
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callbacks: {},
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timeouts: {},
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timers: {},
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// default callback routines
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late: function() {},
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empty: function() {},
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// init JSONP call
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call: function(source, callback_function, timeout_function, timeout, id, parameters) {
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// only one active JSONP call per id
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if (OSRM.JSONP.fences[id] == true)
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return false;
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OSRM.JSONP.fences[id] = true;
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// wrap timeout function
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OSRM.JSONP.timeouts[id] = function(response) {
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try {
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timeout_function(response, parameters);
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} finally {
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OSRM.JSONP.callbacks[id] = OSRM.JSONP.late; // clean functions
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OSRM.JSONP.timeouts[id] = OSRM.JSONP.empty;
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OSRM.JSONP.fences[id] = undefined; // clean fence
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}
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};
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// wrap callback function
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OSRM.JSONP.callbacks[id] = function(response) {
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clearTimeout(OSRM.JSONP.timers[id]); // clear timeout timer
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OSRM.JSONP.timers[id] = undefined;
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try {
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callback_function(response, parameters); // actual wrapped callback
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} finally {
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OSRM.JSONP.callbacks[id] = OSRM.JSONP.empty; // clean functions
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OSRM.JSONP.timeouts[id] = OSRM.JSONP.late;
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OSRM.JSONP.fences[id] = undefined; // clean fence
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}
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};
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// clean DOM
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var jsonp = document.getElementById('jsonp_'+id);
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if(jsonp)
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jsonp.parentNode.removeChild(jsonp);
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// add script to DOM
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var script = document.createElement('script');
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script.type = 'text/javascript';
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script.id = 'jsonp_'+id;
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script.src = source.replace(/%jsonp/,"OSRM.JSONP.callbacks."+id);
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document.head.appendChild(script);
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// start timeout timer
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OSRM.JSONP.timers[id] = setTimeout(OSRM.JSONP.timeouts[id], timeout);
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return true;
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},
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clear: function(id) {
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clearTimeout(OSRM.JSONP.timers[id]); // clear timeout timer
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OSRM.JSONP.callbacks[id] = OSRM.JSONP.empty; // clean functions
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OSRM.JSONP.timeouts[id] = OSRM.JSONP.empty;
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OSRM.JSONP.fences[id] = undefined; // clean fence
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// clean DOM
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var jsonp = document.getElementById('jsonp_'+id);
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if(jsonp)
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jsonp.parentNode.removeChild(jsonp);
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},
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// reset all data
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reset: function() {
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OSRM.JSONP.fences = {};
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OSRM.JSONP.callbacks = {};
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OSRM.JSONP.timeouts = {};
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OSRM.JSONP.timers = {};
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}
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};
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