90 lines
2.5 KiB
JavaScript
90 lines
2.5 KiB
JavaScript
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/**
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* AJAX utility functions for cah. Core library. Individual handlers should be elsewhere.
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*
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* @author ajanata
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*/
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cah.ajax = {};
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cah.ajax.ErrorHandlers = {};
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cah.ajax.SuccessHandlers = {};
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// TODO run a timer to see if we have more than X pending requests and delay further ones until
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// we get results
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cah.ajax.pendingRequests = {};
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cah.ajax.serial = 0;
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$(document).ready(function() {
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$.ajaxSetup({
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cache : false,
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error : cah.ajax.error,
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success : cah.ajax.done,
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timeout : cah.DEBUG ? undefined : 10 * 1000, // 10 second timeout for normal requests
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// timeout : 1, // 10 second timeout for normal requests
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type : 'POST',
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url : '/cah/AjaxServlet'
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});
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// see if we already exist on the server so we can resume
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cah.ajax.request("firstload", {});
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});
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/**
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* Send an ajax request to the server, and store that the request was sent so we know when it gets
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* responded to.
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*
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* This should be used for data sent to the server, not long-polling.
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*
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* @param {string}
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* op Operation code for the request.
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* @param {object}
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* data Parameter map to send for the request.
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* @param {?function(jqXHR,textStatus,errorThrown)}
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* [opt_errback] Optional error callback.
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*/
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cah.ajax.request = function(op, data, opt_errback) {
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data.op = op;
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data.serial = cah.ajax.serial++;
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var jqXHR = $.ajax({
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data : data
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});
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cah.ajax.pendingRequests[data.serial] = data;
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cah.log.debug("ajax req", data);
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if (opt_errback) {
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jqXHR.fail(opt_errback);
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}
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};
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cah.ajax.error = function(jqXHR, textStatus, errorThrown) {
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// TODO deal with this somehow
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// and figure out which request it was so we can remove it from pending
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debugger;
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cah.log.error(textStatus);
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};
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cah.ajax.done = function(data) {
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cah.log.debug("ajax done", data);
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if (data['error']) {
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// TODO cancel any timers or whatever we may have, and disable interface
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var req = cah.ajax.pendingRequests[data.serial];
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if (req && cah.ajax.ErrorHandlers[req.op]) {
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cah.ajax.ErrorHandlers[req.op](data);
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} else {
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cah.log.error(data.error_message);
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}
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} else {
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var req = cah.ajax.pendingRequests[data.serial];
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if (req && cah.ajax.SuccessHandlers[req.op]) {
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cah.ajax.SuccessHandlers[req.op](data);
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} else if (req) {
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cah.log.error("Unhandled response for op " + req.op);
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} else {
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cah.log.error("Unknown response for serial " + data.serial);
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}
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}
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if (data.serial >= 0 && cah.ajax.pendingRequests[data.serial]) {
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delete cah.ajax.pendingRequests[data.serial];
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}
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};
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