Has anybody implemented the equivalent of XMLHttpRequest

[gilado]

[auscompgeek]

You'd need a DOM implementation.

 

Regardless, on Windows, you can try something like this:

xhr = new ActiveX("Microsoft.XMLHTTP");

doc = xhr.get("http://...");

[bryan rasmussen]

If you look at http://www.jsdb.org/cookbook.html
the first recipe shows doing a http request.

best regards,
Bryan Rasmussen

On Wed, Mar 20, 2013 at 2:56 AM, gilado <gil...@gmail.com> wrote:
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[gilado]

On Tuesday, March 19, 2013 6:56:24 PM UTC-7, gilado wrote:

XMLHTTPrequest usually uses asynchronous reply through a callback  which I think cannot be directly implemented in jsdb. However, the synchronous mode can be implemented.

Below see  an implementation of XMLHTTPRequest and a test program.

http://en.wikipedia.org/wiki/XMLHttpRequest

I only implemented the basic functionality (that is, no https, no proxy support, only GET , POST methods, no deflate but should be easy to add)

As mentioned in this thread do not expect the entire DOM (this is not a browser)

/* XMLHTTPRequest.js
 * Copyright (C) 2014 gilado
 */
XMLHttpRequest = function()
{
    var method = null;
    var url = null;
    var async = true;
    var auth = null;
    var path = null;
    var host = null;
    var port = null;
    var hdrs = [];
    var stm = null;
    var this_ = null;

    var response = {}; // Set below

    this.readyState = 0;
    this.responseText = null;

    this.open = function(method_,url_,async_,user_,pass_)
    {
        method = null;
        async = true;
        auth = null;
        hdrs = [];  
        if (stm) stm.close();
        stm = null;
        this_ = null;

        var a = url_.match(/^(.*):\/\/([^\/]*)[\/]?(.*)$/);
        if (!a || a.length < 4 || a[2].length == 0)
            throw("XMLHttpRequest.open: invalid url: '" + url_ + "'");
        if (a[1] != 'http')
            throw("XMLHttpRequest.open: unsupported protocol: '" + a[1] + "'");

        if (method_ != "GET" && method_ != "POST")
            throw("XMLHttpRequest.open: unsupported method: '" + method_ + "'");

        method = method_;
        url = url_;
        if (typeof async_ == 'boolean' && async_ == false)
            async = false;
        if (user_) {
            if (!pass_) pass_ = '';
            auth = encodeB64(user_ + ':' + pass_);
        }
        path = '/' + a[3];
        var b = a[2].split(':');
        host = b[0];
        port = (b.length>1)?b[1]:80;

        stm = new Stream('net://' + host + ':' + port);
        this_ = this;

        hdrs['User-Agent'] = 'JSDB/1.8.0.7';
        hdrs['Accept'] = '*/*';
        hdrs['Host'] = host;

        this.readyState = 0;
        this.responseText = null;
    }
 
    this.setRequestHeader = function(name_,value_)
    {
        hdrs[name_] = '' + value_;
    }

    this.send = function(data_)
    {
        if (stm == null) throw("XMLHttpRequest.send: not connected");

        response.ready = 1;
        response.text = null;
        this.readyState = response.ready;
        this.responseText = response.text;

        if (auth)
            hdrs['Authorization'] = 'Basic ' + auth;

        if (data_)
            hdrs['Content-Length'] = ('' + data_).length;
        else
            delete hdrs['Content-Length'];

        var request = method + ' ' + path + ' HTTP/1.1\r\n';
        for (var i in hdrs)
            request += i + ': ' + hdrs[i] + '\r\n';
        request += '\r\n';
        stm.write(request);
        if (data_)
            stm.write('' + data_);

        response.ready = 2;
        this.readyState = response.ready;
        if (!async)
            while (!response.get());
    }

    this.abort = function()
    {
        if (stm) stm.close();
        stm = null;
        this_ = null;
    }

    response.get = function()
    {
        if (stm == null) throw("XMLHttpRequest.response.get: not connected");

        if (response.ready < 2)
                      throw("XMLHttpRequest.response.get: request not sent");
                     
        if (response.ready == 4) return true;
        if (!stm.canRead) return false;

        if (response.text == null) {
            response.hdrs = new Record('','\r\n');
            var cnt = stm.readMIME(response.hdrs);
            response.cl = response.hdrs.get('Content-Length');
            response.te = response.hdrs.get('Transfer-Encoding');
            response.text = '';
            response.ks = '';
            response.kl = 0;
            response.ready = 3;
            this_.readyState = response.ready;
        }

        if (response.cl && !isNaN(response.cl)) {
            while (response.cl > 0) {
                if (!stm.canRead) return false;
                var s = stm.read(response.cl);
                response.cl -= s.length;
                response.text += s;
            }
        }
        else
        if (response.te && response.te == 'chunked') {
            for (;;) { // De-chunk
                if (!stm.canRead) return false;
                if (response.kl == 0) {
                    var s = response.ks;
                    if (s.length == 0 || s[s.length - 1] != '\r')
                        s = response.ks += stm.readln('\n');
                    if (s.length == 0 || s[s.length - 1] != '\r')
                        continue;
                    response.kl = parseInt(s.substring(0,s.length - 1),16);
                    response.ks = '';
                }
                if (response.kl == 0) {
                    stm.read(2);
                    break;
                }
                var t = stm.read(response.kl);
                response.kl -= t.length;
                response.text += t;
                if (response.kl == 0)
                    stm.read(2);
            }
        }
        else
            response.text = '';

        response.ready = 4;
        this_.readyState = response.ready;
        this_.responseText = response.text;
        return true; // Done
    }

    this.process = function()
    {
        return response.get();
    }
}


/* test_xmlhttprequest.js
 * Copyright (C) 2014 gilado
 */

println("var req = new XMLHttpRequest()");
var req = new XMLHttpRequest();
println("readyState: " + req.readyState);

println("\n------------------------------------------------------------\n");

println("req.open('GET','http://www.jsdb.org/index.html')");
req.open('GET','http://www.jsdb.org/index.html');
println("readyState: " + req.readyState);

println("req.send()");
req.send();
println("readyState: " + req.readyState);

println("while (!req.process())");
while (!req.process());
println("readyState: " + req.readyState);

println("responseText: " + req.responseText);

println("\n------------------------------------------------------------\n");

println("req.open('GET','http://www.jsdb.org/jsdb.gif',false)");
req.open('GET','http://www.jsdb.org/jsdb.gif',false);
println("readyState: " + req.readyState);

println("req.send()");
req.send();
println("readyState: " + req.readyState);

println("responseText (length " + req.responseText.length + "): " + req.responseText);

println("\n------------------------------------------------------------\n");

println("req.open('GET','http://www.jsdb.org/login',false,'username','password')");
req.open('GET','http://www.jsdb.org/login',false,'username','password');
println("readyState: " + req.readyState);

println("req.send()");
req.send();
println("readyState: " + req.readyState);

println("responseText: " + req.responseText);

[Daniel McAnulty]

I've got a question that I thought might be a little too lightweight for this list, but at the same time might be something that people have given a lot of thought to...

I've gotten a lot of mileage out of JSDB with CodeRunner on Mac OS, I use it to automate a lot of one-off tasks for firmware development (I'll do a little bit of scripting, hit Command + r to run, and just copy and paste the console output into my code). One of my colleagues who I've trained to use JSDB this way is switching to windows and is on the lookout for a similar program.

Do any of you have any recommendations for programs that you like to use for JSDB script writing, windows or otherwise?

Dan

[Sue Parker]

Windows natively with execute .cmd files with an enhanced batch language, .ps1 files with powershell, .vbs or .js files with cscript (Windows Scripting Host or WSH).  The .vbs files use the VBScript language and the .js files use JScript language.  Both are slightly different that the full versions of the language. 

But if you want a robust, run anywhere version of JavaScript, then download and install NodeJS.  Its a simple install.  You can then set the extension .njs to run the node.exe program.  You do need to deal with NodeJS's asynchronous execution of JavaScript.  But there are thousands of add-on libraries that you can install with NPM, including programs like sync to execute function synchronously.

Sue  

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[Alex.M]

One more alternative for multi-platform script runner is PhantomJS http://phantomjs.org/download.html. It is more lightweight than Node.js and has platform-independent API for working with files and processes.

среда, 20 марта 2013 г., 6:56:24 UTC+5 пользователь gilado написал: