<分区>
我如何利用它来实现功能？
//check if station is alive
$.ajax({
url: "lib/grab.php",
data: "check_live=1&stream_url="+valueSelected,
type: "GET",
success: function (resp) {
if (resp == 1) {
play_this(valueSelected);
} else {
//
}
},
error: function (e) {
console.dir(e);
}
});
我以为我可以做这样的事情:
function is_alive(valueSelected) {
result = false;
//check if station is alive
$.ajax({
url: "lib/grab.php",
data: "check_live=1&stream_url="+valueSelected,
type: "GET",
success: function (resp) {
if (resp == 1) {
result = true;
} else {
//
}
},
error: function (e) {
console.dir(e);
}
});
return result;
}
但显然由于 ajax 调用的异步特性，结果总是返回 false。
处理这种情况的技巧是什么？
似乎有效:
//check if station is alive
function is_alive(url) {
//
var result = false;
//
return $.ajax({
url: "lib/grab.php",
data: "check_live=1&stream_url="+url,
type: "GET",
success: function (resp) {
if (resp == 1) {
//
result = true;
//
}
},
error: function (e) {
console.dir(e);
}
}).then(function() {
return $.Deferred(function(def) {
def.resolveWith({},[result,url]);
}).promise();
});
}
然后这样调用它:
//Change song on select, works both for fav and station lists
$(document).on("click", ".ui-listview li a", function(){
var valueSelected = $(this).data("station-url");
//
is_alive(valueSelected).done(function(result,url){
if (result) {
//
play_this(valueSelected);
//
}
});
});