create C API for setting element style

Author: jakogut

site/source/docs/api_reference/emscripten.h.rst

@@ -472,6 +472,13 @@ Functions
 
   Note that SDL’s ``SDL_ShowCursor`` command shows and hides the SDL cursor, not the OS one. This command is useful to hide the OS cursor if your app draws its own cursor.
 
+.. c:function:: void emscripten_set_element_style(char *selector, char *property, char *value)
+
+  Sets an inline style property of a given element
+
+  :param char *selector: Name of element to set a style property on
+  :param char *property: Name of property to set
+  :param char *value: Value to assign to style property
 
 .. c:function:: double emscripten_get_now(void)
 

src/library_browser.js

@@ -1394,6 +1394,13 @@ var LibraryBrowser = {
     styleSheet.insertRule('canvas.emscripten { border: 1px solid black; cursor: none; }', 0);
   },
 
+  emscripten_set_element_style__proxy: 'sync',
+  emscripten_set_element_style__sig: 'viii',
+  emscripten_set_element_style: function(selector, property, value) {
+    var element = Module[selector];
+    if (element) element.style[property] = UTF8ToString(value);
+  },
+
   emscripten_set_canvas_size__proxy: 'sync',
   emscripten_set_canvas_size__sig: 'vii',
   emscripten_set_canvas_size: function(width, height) {

system/include/emscripten/emscripten.h

@@ -138,6 +138,7 @@ double emscripten_get_device_pixel_ratio(void);
 void emscripten_set_window_title(const char *);
 void emscripten_get_screen_size(int *width, int *height);
 void emscripten_hide_mouse(void);
+void emscripten_set_element_style(const char *, const char *, const char *);
 void emscripten_set_canvas_size(int width, int height) __attribute__((deprecated("This variant does not allow specifying the target canvas", "Use emscripten_set_canvas_element_size() instead")));
 void emscripten_get_canvas_size(int *width, int *height, int *isFullscreen) __attribute__((deprecated("This variant does not allow specifying the target canvas", "Use emscripten_get_canvas_element_size() and emscripten_get_fullscreen_status() instead")));