yew_stdweb/services/
dialog.rs

1//! This module contains the implementation of a service
2//! to show alerts and confirm dialogs in a browser.
3//!
4//! If you call these methods repeatably browsers tend to disable these options to give users
5//! a better experience.
6
7use cfg_if::cfg_if;
8use cfg_match::cfg_match;
9cfg_if! {
10    if #[cfg(feature = "std_web")] {
11        use stdweb::Value;
12        #[allow(unused_imports)]
13        use stdweb::{_js_impl, js};
14    } else if #[cfg(feature = "web_sys")] {
15        use crate::utils;
16    }
17}
18
19/// A dialog service.
20#[derive(Default, Debug)]
21pub struct DialogService {}
22
23impl DialogService {
24    /// Calls [alert](https://developer.mozilla.org/en-US/docs/Web/API/Window/alert)
25    /// function.
26    pub fn alert(message: &str) {
27        cfg_match! {
28            feature = "std_web" => js! { @(no_return) alert(@{message}); },
29            feature = "web_sys" => utils::window().alert_with_message(message).unwrap(),
30        };
31    }
32
33    /// Calls [confirm](https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm)
34    /// function.
35    pub fn confirm(message: &str) -> bool {
36        cfg_match! {
37            feature = "std_web" => ({
38                let value: Value = js! { return confirm(@{message}); };
39                match value {
40                    Value::Bool(result) => result,
41                    _ => false,
42                }
43            }),
44            feature = "web_sys" => utils::window().confirm_with_message(message).unwrap(),
45        }
46    }
47
48    /// Prompts the user to input a message. In most browsers this will open an alert box with
49    /// an input field where the user can input a message.
50    #[cfg_attr(
51        feature = "web_sys",
52        doc = "A default value can be supplied which will be returned if the user doesn't input anything."
53    )]
54    ///
55    /// [MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt)
56    ///
57    /// This method will `panic!` if there is an error in the process of trying to carry out this
58    /// operation.
59    ///
60    /// Note that this function is blocking; no other code can be run on the thread while
61    /// the user inputs their message which means that the page will appear to have 'frozen'
62    /// while the user types in their message.
63    ///
64    #[cfg_attr(
65        feature = "web_sys",
66        doc = "This function will return `None` if the value of `default` is `None` and the user \
67        cancels the operation. (normally a 'cancel' button will be displayed to the user, \
68        clicking which cancels the operation)."
69    )]
70    #[cfg_attr(
71        feature = "std_web",
72        doc = "This function will return `None` if the user cancels the operation (normally a \
73        'cancel' button will be displayed to the user, clicking which cancels the operation)."
74    )]
75    pub fn prompt(
76        message: &str,
77        #[cfg(feature = "web_sys")] default: Option<&str>,
78    ) -> Option<String> {
79        cfg_if! {
80            if #[cfg(feature="web_sys")] {
81                if let Some(default) = default {
82                    utils::window()
83                           .prompt_with_message_and_default(message, default)
84                           .expect("Couldn't read input.")
85                }
86                else {
87                    utils::window()
88                           .prompt_with_message(message)
89                           .expect("Couldn't read input.")
90                }
91            } else if #[cfg(feature="std_web")] {
92                let value: Value = js! { return prompt(@{message}); };
93                match value {
94                    Value::String(result) => Some(result),
95                    _ => None,
96                }
97            }
98        }
99    }
100}
yew_stdweb/services/dialog.rs

yew_stdweb/services/
dialog.rs
