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# JavaScript Engine: XMLHTTPRequest example

Note: This topic applies to Web - HTTP/HTML Vuser scripts written in C only.

VuGen's JavaScript Engine enables you to include JavaScript code in a Vuser script. For details on the JavaScript Engine, see Using the VuGen JavaScript engine.

The example below shows how you can use a JavaScript XMLHTTPRequest object in a Web(HTTP/HTML) Vuser script. In this example, the XMLHTTPRequest object enables the Vuser to download a stock quote from finance.example.com, and then to save the value to a parameter for future use.

The script section below shows a web_js_run function that has been inserted into a Vuser script. The web_js_run function includes a reference to a file called XMLHTTPRequest_sync_sample.js. This file contains the JavaScript code that executes the XMLHTTPRequest function.

Copy code

    web.js_run(
        "Code=getQuotes(LR.getParam('symbol'));",
        "ResultParam=param",
        SOURCES,
        "File=XMLHTTPRequest_sync_sample.js",
        ENDITEM,
        LAST
    );

The content of the XMLHTTPRequest_sync_sample.js file is shown below.

Copy code

    var req2;

    function getQuotes(mySymbol) {
        var myURL = "http://download.finance.example.com/d/quotes.csv?s=" + mySymbol + "&f=1&e=.csv";

        req2 = false;
        // Branch for native XMLHttpRequest object
        try {
            req2 = new XMLHttpRequest();
        } catch(e) {
            req2 = false;
        }

        if(req2) {
            req2.open("GET", myURL, false);
            req2.send("");
        }
        return 1 * req2.responseText;
    }

- For additional examples of code used with the JavaScript Engine, see the Function Reference.

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