themes/base: xhr.js: implement running(), run() and halt() to check, start and stop...

[project/luci.git] / themes / base / htdocs / luci-static / resources / xhr.js

diff --git a/themes/base/htdocs/luci-static/resources/xhr.js b/themes/base/htdocs/luci-static/resources/xhr.js
index 453c2ba..701c12a 100644 (file)
--- a/themes/base/htdocs/luci-static/resources/xhr.js
+++ b/themes/base/htdocs/luci-static/resources/xhr.js
@@ -172,13 +172,22 @@ XHR.get = function(url, data, callback)
 
 XHR.poll = function(interval, url, data, callback)
 {
-       if (isNaN(interval) || interval <= 1)
+       if (isNaN(interval) || interval < 1)
                interval = 5;
 
        if (!XHR._q)
        {
                XHR._t = 0;
                XHR._q = [ ];
+               XHR._r = function() {
+                       for (var i = 0, e = XHR._q[0]; i < XHR._q.length; e = XHR._q[++i])
+                       {
+                               if (!(XHR._t % e.interval) && !e.xhr.busy())
+                                       e.xhr.get(e.url, e.data, e.callback);
+                       }
+
+                       XHR._t++;
+               };
        }
 
        XHR._q.push({
@@ -189,16 +198,44 @@ XHR.poll = function(interval, url, data, callback)
                xhr:      new XHR()
        });
 
-       if (!XHR._i)
+       XHR.run();
+}
+
+XHR.halt = function()
+{
+       if (XHR._i)
        {
-               XHR._i = window.setInterval(function() {
-                       for (var i = 0, e = XHR._q[0]; i < XHR._q.length; e = XHR._q[++i])
-                       {
-                               if (!(XHR._t % e.interval) && !e.xhr.busy())
-                                       e.xhr.get(e.url, e.data, e.callback);
-                       }
+               /* show & set poll indicator */
+               try {
+                       document.getElementById('xhr_poll_status').style.display = '';
+                       document.getElementById('xhr_poll_status_on').style.display = 'none';
+                       document.getElementById('xhr_poll_status_off').style.display = '';
+               } catch(e) { }
+
+               window.clearInterval(XHR._i);
+               XHR._i = null;
+       }
+}
 
-                       XHR._t++;
-               }, 1000);
+XHR.run = function()
+{
+       if (XHR._r && !XHR._i)
+       {
+               /* show & set poll indicator */
+               try {
+                       document.getElementById('xhr_poll_status').style.display = '';
+                       document.getElementById('xhr_poll_status_on').style.display = '';
+                       document.getElementById('xhr_poll_status_off').style.display = 'none';
+               } catch(e) { }
+
+               /* kick first round manually to prevent one second lag when setting up
+                * the poll interval */
+               XHR._r();
+               XHR._i = window.setInterval(XHR._r, 1000);
        }
 }
+
+XHR.running = function()
+{
+       return !!(XHR._r && XHR._i);
+}