|
|
@@ -0,0 +1,132 @@
|
|
|
+/*
|
|
|
+ helper functions for RemoteID javascript
|
|
|
+*/
|
|
|
+
|
|
|
+// helper function for cross-origin requests
|
|
|
+function createCORSRequest(method, url) {
|
|
|
+ var xhr = new XMLHttpRequest();
|
|
|
+ if ("withCredentials" in xhr) {
|
|
|
+ // XHR for Chrome/Firefox/Opera/Safari.
|
|
|
+ xhr.open(method, url, true);
|
|
|
+ } else if (typeof XDomainRequest != "undefined") {
|
|
|
+ // XDomainRequest for IE.
|
|
|
+ xhr = new XDomainRequest();
|
|
|
+ xhr.open(method, url);
|
|
|
+ } else {
|
|
|
+ // CORS not supported.
|
|
|
+ xhr = null;
|
|
|
+ }
|
|
|
+ return xhr;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ fill variables in a page from json
|
|
|
+*/
|
|
|
+function page_fill_json_value(json) {
|
|
|
+ for (var v in json) {
|
|
|
+ var element = document.getElementById(v);
|
|
|
+ if (element) {
|
|
|
+ element.value = json[v];
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ fill html in a page from json
|
|
|
+*/
|
|
|
+function page_fill_json_html(json) {
|
|
|
+ for (var v in json) {
|
|
|
+ var element = document.getElementById(v);
|
|
|
+ if (element) {
|
|
|
+ element.innerHTML = json[v];
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ fetch a URL, calling a callback
|
|
|
+*/
|
|
|
+function ajax_get_callback(url, callback) {
|
|
|
+ var xhr = createCORSRequest("GET", url);
|
|
|
+ xhr.onload = function() {
|
|
|
+ callback(xhr.responseText);
|
|
|
+ }
|
|
|
+ xhr.send();
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ fetch a URL, calling a callback for binary data
|
|
|
+*/
|
|
|
+function ajax_get_callback_binary(url, callback) {
|
|
|
+ var xhr = createCORSRequest("GET", url);
|
|
|
+ xhr.onload = function() {
|
|
|
+ console.log("got response length " + xhr.response.byteLength);
|
|
|
+ callback(xhr.response);
|
|
|
+ }
|
|
|
+ xhr.responseType = "arraybuffer";
|
|
|
+ xhr.send();
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ poll a URL, calling a callback
|
|
|
+*/
|
|
|
+function ajax_poll(url, callback, refresh_ms=1000) {
|
|
|
+ function again() {
|
|
|
+ setTimeout(function() { ajax_poll(url, callback, refresh_ms); }, refresh_ms);
|
|
|
+ }
|
|
|
+ var xhr = createCORSRequest("GET", url);
|
|
|
+ xhr.onload = function() {
|
|
|
+ if (callback(xhr.responseText)) {
|
|
|
+ again();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ xhr.onerror = function() {
|
|
|
+ again();
|
|
|
+ }
|
|
|
+ xhr.timeout = 3000;
|
|
|
+ xhr.ontimeout = function() {
|
|
|
+ again();
|
|
|
+ }
|
|
|
+ xhr.send();
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ poll a json file and fill document IDs at the given rate
|
|
|
+*/
|
|
|
+function ajax_json_poll(url, callback, refresh_ms=1000) {
|
|
|
+ function do_callback(responseText) {
|
|
|
+ try {
|
|
|
+ var json = JSON.parse(responseText);
|
|
|
+ return callback(json);
|
|
|
+ } catch(e) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ /* on bad json keep going */
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ ajax_poll(url, do_callback, refresh_ms);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ poll a json file and fill document IDs at the given rate
|
|
|
+*/
|
|
|
+function ajax_json_poll_fill(url, refresh_ms=1000) {
|
|
|
+ function callback(json) {
|
|
|
+ page_fill_json_html(json);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ ajax_json_poll(url, callback, refresh_ms);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ set a message in a div by id, with given color
|
|
|
+*/
|
|
|
+function set_message_color(id, color, message) {
|
|
|
+ var element = document.getElementById(id);
|
|
|
+ if (element) {
|
|
|
+ element.innerHTML = '<b style="color:' + color + '">' + message + '</b>';
|
|
|
+ }
|
|
|
+}
|
Andrew Tridgell