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Return an abortable request from jsonp_request

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This commit is contained in:
Bryan Housel
2018-06-19 23:06:37 -04:00
parent 65dc04424d
commit 4c812b6f35
2 changed files with 53 additions and 35 deletions
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2
modules/services/streetside.js
View File

@@ -247,7 +247,7 @@ function getBubbles(url, tile, callback) {
jsCallback: '{callback}'
});
jsonpRequest(urlForRequest, function (data) {
return jsonpRequest(urlForRequest, function (data) {
if (!data || data.error) {
callback(null);
} else {

86
modules/util/jsonp_request.js
View File

@@ -1,43 +1,61 @@
import { select as d3_select } from 'd3-selection';
var jsonpCache = {};
window.jsonpCache = jsonpCache;
export function jsonpRequest(url, callback) {
if (window.JSONP_FIX) {
if (window.JSONP_DELAY === 0) {
callback(window.JSONP_FIX);
} else {
setTimeout(function() {
callback(window.JSONP_FIX);
}, window.JSONP_DELAY || 0);
}
return;
}
function rand() {
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz',
c = '', i = -1;
while (++i < 15) c += chars.charAt(Math.floor(Math.random() * 52));
return c;
}
function create(url) {
var e = url.match(/callback=(\w+)/),
c = e ? e[1] : rand();
jsonpCache[c] = function(data) {
callback(data);
delete jsonpCache[c];
script.remove();
var request = {
abort: function() {}
};
return 'jsonpCache.' + c;
}
var cb = create(url),
script = d3_select('head')
.append('script')
.attr('type', 'text/javascript')
.attr('src', url.replace(/(\{|%7B)callback(\}|%7D)/, cb));
if (window.JSONP_FIX) {
if (window.JSONP_DELAY === 0) {
callback(window.JSONP_FIX);
} else {
var t = window.setTimeout(function() {
callback(window.JSONP_FIX);
}, window.JSONP_DELAY || 0);
request.abort = function() { window.clearTimeout(t); };
}
return request;
}
function rand() {
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
var c = '';
var i = -1;
while (++i < 15) c += chars.charAt(Math.floor(Math.random() * 52));
return c;
}
function create(url) {
var e = url.match(/callback=(\w+)/);
var c = e ? e[1] : rand();
jsonpCache[c] = function(data) {
if (jsonpCache[c]) {
callback(data);
}
finalize();
};
function finalize() {
delete jsonpCache[c];
script.remove();
}
request.abort = finalize;
return 'jsonpCache.' + c;
}
var cb = create(url);
var script = d3_select('head')
.append('script')
.attr('type', 'text/javascript')
.attr('src', url.replace(/(\{|%7B)callback(\}|%7D)/, cb));
return request;
}