qml使用js-httprequest

最新推荐文章于 2025-10-24 12:22:46 发布

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#cascades #BlackBerry 10 #qml

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本文详细介绍了如何在Cascades中利用XMLHttpRequest进行异步消息传递，实现与Web服务的交互。重点包括代码示例、设置及处理响应的方法。

jqm中可以使用HTTPRequest。不用设置权限，但是有限制，只能使用异步消息。

代码框架如下：

function submitPost(postString) {
                var request = new XMLHttpRequest();
                request.onreadystatechange=function() {
                    // Need to wait for the DONE state or you'll get errors
                    if(request.readyState === XMLHttpRequest.DONE) {
                        if (request.status === 200) {
                            console.log("Response = " + request.responseText);
                            // if response is JSON you can parse it
                            var response = JSON.parse(request.responseText);
                            // then do something with it here
                      
                        }
                        else {
                            // This is very handy for finding out why your web service won't talk to you
                            console.log("Status: " + request.status + ", Status Text: " + request.statusText);
                        }
                    }
                }
                // Make sure whatever you post is URI encoded
                var encodedString = encodeURIComponent(postString);
                // This is for a POST request but GET etc. work fine too
                request.open("POST", "https://<your_service_endpoint_here>", true); // only async supported
                // You might not need an auth header, or might need to modify - check web service docs
                request.setRequestHeader("Authorization", "Bearer " + yourAccessToken);
                // Post types other than forms should work fine too but I've not tried
                request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
                // Form data is web service dependent - check parameter format
                var requestString = "text=" + encodedString;
                request.send(requestString);
            }

具体参见

http://supportforums.blackberry.com/t5/Cascades-Development-Knowledge/Using-XMLHttpRequest-from-QML-in-Cascades-to-access-web-services/ta-p/2023573