114 lines
2.9 KiB
JavaScript
114 lines
2.9 KiB
JavaScript
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var HTTPReq = new Object;
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HTTPReq.create = function () {
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var xtr;
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var ex;
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if (typeof(XMLHttpRequest) != "undefined") {
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xtr = new XMLHttpRequest();
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} else {
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try {
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xtr = new ActiveXObject("Msxml2.XMLHTTP.4.0");
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} catch (ex) {
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try {
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xtr = new ActiveXObject("Msxml2.XMLHTTP");
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} catch (ex) {
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}
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}
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}
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// let me explain this. Opera 8 does XMLHttpRequest, but not setRequestHeader.
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// no problem, we thought: we'll test for setRequestHeader and if it's not present
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// then fall back to the old behavior (treat it as not working). BUT --- IE6 won't
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// let you even test for setRequestHeader without throwing an exception (you need
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// to call .open on the .xtr first or something)
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try {
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if (xtr && ! xtr.setRequestHeader)
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xtr = null;
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} catch (ex) { }
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return xtr;
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};
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// opts:
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// url, onError, onData, method (GET or POST), data
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// url: where to get/post to
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// onError: callback on error
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// onData: callback on data received
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// method: HTTP method, GET by default
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// data: what to send to the server (urlencoded)
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HTTPReq.getJSON = function (opts) {
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var req = HTTPReq.create();
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if (! req) {
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if (opts.onError) opts.onError("noxmlhttprequest");
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return;
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}
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var state_callback = function () {
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if (req.readyState != 4) return;
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if (req.status != 200) {
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if (opts.onError) opts.onError(req.status ? "status: " + req.status : "no data");
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return;
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}
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var resObj;
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var e;
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try {
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eval("resObj = " + req.responseText + ";");
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} catch (e) {
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}
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if (e || ! resObj) {
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if (opts.onError)
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opts.onError("Error parsing response: \"" + req.responseText + "\"");
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return;
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}
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if (opts.onData)
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opts.onData(resObj);
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};
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req.onreadystatechange = state_callback;
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var method = opts.method || "GET";
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var data = opts.data || null;
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var url = opts.url;
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if (opts.method == "GET" && opts.data) {
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url += url.match(/\?/) ? "&" : "?";
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url += opts.data
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}
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url += url.match(/\?/) ? "&" : "?";
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url += "_rand=" + Math.random();
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req.open(method, url, true);
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// we should send null unless we're in a POST
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var to_send = null;
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if (method.toUpperCase() == "POST") {
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req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
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to_send = data;
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}
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req.send(to_send);
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};
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HTTPReq.formEncoded = function (vars) {
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var enc = [];
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var e;
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for (var key in vars) {
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try {
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if (!vars.hasOwnProperty(key))
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continue;
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enc.push(encodeURIComponent(key) + "=" + encodeURIComponent(vars[key]));
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} catch( e ) {}
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}
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return enc.join("&");
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};
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