Fix custom js param

.changeset/light-lemons-smoke.md

@@ -0,0 +1,7 @@
+---
+"@self/app": patch
+"@self/spa": patch
+"gradio": patch
+---
+
+fix:Fix custom `js` param

demo/blocks_js_load/run.py

@@ -35,6 +35,8 @@ def welcome(name):
 
     return 'Animation created';
 }
+
+createGradioAnimation();
 """
 
 with gr.Blocks() as demo:

gradio/blocks.py

@@ -2497,7 +2497,7 @@ def launch(
             theme: A Theme object or a string representing a theme. If a string, will look for a built-in theme with that name (e.g. "soft" or "default"), or will attempt to load a theme from the Hugging Face Hub (e.g. "gradio/monochrome"). If None, will use the Default theme.
             css: Custom css as a code string. This css will be included in the demo webpage.
             css_paths: Custom css as a pathlib.Path to a css file or a list of such paths. This css files will be read, concatenated, and included in the demo webpage. If the `css` parameter is also set, the css from `css` will be included first.
-            js: Custom js as a code string. The custom js should be in the form of a single js function. This function will automatically be executed when the page loads. For more flexibility, use the head parameter to insert js inside <script> tags.
+            js: Custom js as a code string. The js code will automatically be executed when the page loads. For more flexibility, use the head parameter to insert js inside <script> tags.
             head: Custom html code to insert into the head of the demo webpage. This can be used to add custom meta tags, multiple scripts, stylesheets, etc. to the page.
             head_paths: Custom html code as a pathlib.Path to a html file or a list of such paths. This html files will be read, concatenated, and included in the head of the demo webpage. If the `head` parameter is also set, the html from `head` will be included first.
         Returns:
@@ -2647,7 +2647,6 @@ def reverse(text):
             print(self.mcp_error)
 
         self.config = self.get_config_file()
-
         if self.is_running:
             if not isinstance(self.local_url, str):
                 raise ValueError(f"Invalid local_url: {self.local_url}")

js/app/src/routes/[...catchall]/+page.svelte

@@ -292,6 +292,16 @@
 			window.parent.postMessage(supports_zerogpu_headers, origin);
 		}
 
+		if (config.js) {
+			try {
+				const script = document.createElement("script");
+				script.textContent = config.js;
+				document.head.appendChild(script);
+			} catch (e) {
+				console.error("Error executing custom JS:", e);
+			}
+		}
+
 		dispatch("loaded");
 		if (config.dev_mode) {
 			setTimeout(() => {

js/spa/src/Index.svelte

@@ -375,7 +375,15 @@
 		if (config.deep_link_state === "invalid") {
 			pending_deep_link_error = true;
 		}
-
+		if (config.js) {
+			try {
+				const script = document.createElement("script");
+				script.textContent = config.js;
+				document.head.appendChild(script);
+			} catch (e) {
+				console.error("Error executing custom JS:", e);
+			}
+		}
 		if (config.dev_mode) {
 			setTimeout(() => {
 				const { host } = new URL(api_url);