通过Java脚本监听Http服务器端请求（文档类型）事件

Question

I am trying to show a gif or message at the moment user click on the link or change URL to send a request to server-side (no ajax call). My reason is: some pages take some seconds to be processed and it would be better user see a loading message while the request is processing.

I tried to listen to server-side events. I checked chrome how it works and captures this kind of requests. chrome differentiate these types of requests with others base on the document type.

My exact question is: How can I capture/listen to the HTTP request with document type via Javascript at the moment of sending the request to server?

Answer 1

I found the solution with using window.onbeforeunload() function. this event rise whenever any refresh or load happens.

window.onbeforeunload = function (evt) {
        console.log("onbeforeunload Call listen to refresh event on _layout page.")
        ShowWaiting(true);
    }