How to Create a Simple SOAP Client in JavaScript Without External Libraries?

Simple SOAP Implementation Using JavaScript

How can you create a basic SOAP example using JavaScript?

To provide a practical and comprehensive answer, the SOAP client should meet the following criteria:

• Functionality: Must be operational.
• Parameter Transfer: Ability to send a variable parameter from the code.
• Result Processing: Capacity to retrieve and utilize a result value.
• Browser Compatibility: Works with most modern browsers.
• Simplicity and Conciseness: Uses minimal code and avoids external libraries.

Solution

The following is the simplest JavaScript SOAP client:

function soap() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open('POST', 'https://somesoapurl.com/', true);
    var sr = '<?xml version="1.0" encoding="utf-8"?>' +
        '<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:api="http://127.0.0.1/Integrics/Enswitch/API" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">' +
        '<soapenv:Body>' +
        '<api:some_api_call soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">' +
        '<username xsi:type="xsd:string">login_username</username>' +
        '<password xsi:type="xsd:string">password</password>' +
        '</api:some_api_call>' +
        '</soapenv:Body>' +
        '</soapenv:Envelope>';
    xmlhttp.onreadystatechange = function () {
        if (xmlhttp.readyState == 4) {
            if (xmlhttp.status == 200) {
                alert(xmlhttp.responseText);
            }
        }
    }
    xmlhttp.setRequestHeader('Content-Type', 'text/xml');
    xmlhttp.send(sr);
}

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