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我正在使用elm中的端口来访问浏览器的全屏API。在Chrome中一切正常,但在Firefox中不起作用。我得到的错误是:Request for full-screen was denied because Element.mozRequestFullScreen() was not called from inside a short running user-generated event handler.
但是,我认为我理解了错误消息,因为我希望它能够工作,因为我通过单击按钮访问全屏API。中间只有一个榆树港。有没有人解决过这个问题?在elm中使用端口的全屏API在Firefox中不起作用
这是我的榆木代码:
port module Main exposing (..)
import Html exposing (Html, button, div, text)
import Html.Events exposing (onClick)
import Html.Attributes exposing (class)
main =
Html.program { init = init, view = view, update = update, subscriptions = subscriptions }
-- Model
type alias Model =
{ fullscreen : Bool }
init : (Model, Cmd Msg)
init =
({ fullscreen = False }
, Cmd.none
)
-- Ports
port activateFullscreen : String -> Cmd msg
port deactivateFullscreen : String -> Cmd msg
subscriptions : Model -> Sub Msg
subscriptions model =
Sub.none
type Msg
= FullscreenMode Bool
-- Update
update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
case msg of
FullscreenMode on ->
let
m =
{ model | fullscreen = on }
in
if on then
(m, activateFullscreen "")
else
(m, deactivateFullscreen "")
-- views
fullScreenButton : Model -> Html Msg
fullScreenButton model =
case model.fullscreen of
False ->
button [ onClick (FullscreenMode True) ]
[ text "fullscreen on" ]
True ->
button [ onClick (FullscreenMode False) ]
[ text "fullscreen off" ]
view : Model -> Html Msg
view model =
div [ class "app" ] [ fullScreenButton model ]
和我的html代码:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<title>Fullscreen Test</title>
</head>
<body>
<div id="main"></div>
<script src="main.js"></script>
<script>
(function() {
window.onload = function() {
var node = document.getElementById('main');
var app = Elm.Main.embed(node);
app.ports.activateFullscreen.subscribe(function() {
var element = document.querySelector('.app');
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen();
}
});
app.ports.deactivateFullscreen.subscribe(function() {
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
}
});
};
}());
</script>
</body>
</html>
大概火狐这样做是为了防止网站随意劫持您的屏幕。我很想知道Chrome和IE是否做了类似的事情,但对构成“短时间运行的用户生成的事件处理程序”的内容有不同的看法。正如你所提到的,这最终是由一个按钮点击触发的,但由于中间有一堆Elm生成的代码,所以会有一定程度的间接性。这可能只是Firefox不认为它是“短跑”。 –
在http://stackoverflow.com/a/43297759/2688中有一个解决方法,它使用'window.open',这可能会起作用(只需使用直接JavaScript的字符串'onClick'属性) – bdukes