Servis-Rhino 4211B Betriebsanweisung PDF herunterladen (Seite 141)

• xhr.post() - make an HTTP POST request

Each of these methods takes two arguments:

• url – The target URL of the request

• options – A JavaScript object which sets options on the request

Some of the more prevalent options available include:

• query – An object where the property names will be query parameter names and the

property values will be the corresponding query parameter values.

• handleAs – How the return data should be handled. Values include:

◦ "json" – Handle the response as a JSON encoded object.

◦ "javascript"

◦ "xml"

• headers – An object where the property names will be added as HTTP headers and the

property values as the corresponding value of the property header.

• data – For PUT and POST, this is the payload of the data to be transmitted.

Since the result from calling one of these functions is a Dojo Deferred, we can use the "then()"

method to handle the response. The general form is:

then(function(data) {}, function(data) {});

The first function is called when the REST request returns good data and the second function is

called if an error is detected.

Here is an example call:

xhr.get("/rest/bpm/wle/v1/task/" + taskId + "/clientSettings/IBM_WLE_Coach", {

"handleAs": "json" }).then(function(data) {…}, function(data) {…});

If we wish to add basic authentication headers to the HTTP request, we can do that too. For

example, the following header property will achieve this:

Authorization: Basic QwxhZGRpbjpvcGVuIHNlc2FtZQ==

Where the Base64 encoded text is "username:password". We can generate a base64 encoded

value using:

var bytes = [];

var str = userid + ":" + password;

for (var i = 0; i < str.length; ++i)

{

bytes.push(str.charCodeAt(i));

}

var authorization = "Basic " + base64.encode(bytes);

The "base64" package is "dojox/encoding/base64".

When sending JSON data in the payload of a REST request, set the headers property to be:

{

'Content-Type': 'application/json;charset=UTF-8'

};

also send the payload as a JSON String representation using:

JSON.stringify(object);

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Servis-Rhino 4211B Betriebsanweisung Seite 141