add use_eval()to desktop and web

packages/web/src/lib.rs

@@ -62,12 +62,14 @@ use dioxus::VirtualDom;
 pub use dioxus_core as dioxus;
 use dioxus_core::prelude::Component;
 use futures_util::FutureExt;
+pub use crate::util::use_eval;
 
 mod cache;
 mod cfg;
 mod dom;
 mod rehydrate;
 mod ric_raf;
+mod util;
 
 /// Launch the VirtualDOM given a root component and a configuration.
 ///

packages/web/src/util.rs

@@ -1 +1,24 @@
 //! Utilities specific to websys
+
+use dioxus_core::*;
+
+/// Get a closure that executes any JavaScript in the webpage.
+///
+/// # Safety
+///
+/// Please be very careful with this function. A script with too many dynamic
+/// parts is practically asking for a hacker to find an XSS vulnerability in
+/// it. **This applies especially to web targets, where the JavaScript context
+/// has access to most, if not all of your application data.**
+///
+/// # Panics
+///
+/// The closure will panic if the provided script is not valid JavaScript code
+/// or if it returns an uncaught error.
+pub fn use_eval<S: std::fmt::Display>(_cx: &ScopeState) -> impl Fn(S) {
+    |script| {
+        js_sys::Function::new_no_args(&script.to_string())
+            .call0(&wasm_bindgen::JsValue::NULL)
+            .expect("failed to eval script");
+    }
+}