83 lines
No EOL
1.9 KiB
JavaScript
83 lines
No EOL
1.9 KiB
JavaScript
var IframeComet = new function() {
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var self = this;
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var connectTries = 0,
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reconnectTimer;
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var htmlfile; // for ie only
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var iframe;
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this.onConnected = function() {
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connectTries = 0;
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clearTimeout(reconnectTimer);
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};
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this.onMessage = function(message) { /* ... */ };
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this.onError = function(err) { /* ... */ };
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this.open = function(url) {
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connectTries++;
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if (connectTries > 3) {
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self.onError("Unable to connect");
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}
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if ("ActiveXObject" in window) { // IE
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createActiveXFrame(url);
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} else {
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createIframe(url);
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}
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reconnectTimer = setTimeout(function() {
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if (!self.isConnected()) {
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self.open(url);
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}
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}, connectTries * 2000);
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// в Chrome не срабатывает при обрыве соединения,
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// так что используем там другой =) транспорт
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iframe.onload = function() {
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self.open(url);
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};
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};
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this.isConnected = function() {
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return connectTries == 0; // onConnect обнуляет connectTries
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}
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function cleanIframe() {
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if (iframe) {
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iframe.src = "javascript:false";
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iframe.parentNode.removeChild(iframe); // очистка
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}
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}
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function createIframe(src) {
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cleanIframe();
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iframe = document.createElement('iframe');
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iframe.src = src || 'javascript:false';
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iframe.style.display = 'none';
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document.body.appendChild(iframe);
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}
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function createActiveXFrame(src) {
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cleanIframe();
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if (!htmlfile) {
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htmlfile = new ActiveXObject("htmlfile");
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htmlfile.open();
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htmlfile.write("<html><body></body></html>");
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htmlfile.close();
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htmlfile.parentWindow.IframeComet = self;
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}
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src = src || 'javascript:false'; // пустой src
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htmlfile.body.insertAdjacentHTML('beforeEnd', "<iframe src='" + src + "'></iframe>");
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iframe = htmlfile.body.lastChild; // window in .document.parentWindow
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}
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} |