add "api.runOnFrontend()" to the backend script API

docs/backend_api/BackendScriptApi.html

@@ -240,7 +240,7 @@ available in the JS backend notes. You can use e.g. <code>api.log(api.startNote.
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="services_backend_script_api.js.html">services/backend_script_api.js</a>, <a href="services_backend_script_api.js.html#line537">line 537</a>
+        <a href="services_backend_script_api.js.html">services/backend_script_api.js</a>, <a href="services_backend_script_api.js.html#line579">line 579</a>
     </li></ul></dd>
     
 
@@ -6381,6 +6381,191 @@ if some action needs to happen on only one specific instance.
     
 
     
+    <h4 class="name" id="runOnFrontend"><span class="type-signature"></span>runOnFrontend<span class="signature">(script, params)</span><span class="type-signature"> &rarr; {undefined}</span></h4>
+    
+
+    
+
+
+
+<div class="description">
+    Executes given anonymous function on the frontend(s).
+Internally this serializes the anonymous function into string and sends it to frontend(s) via WebSocket.
+Note that there can be multiple connected frontend instances (e.g. in different tabs). In such case, all
+instances execute the given function.
+</div>
+
+
+
+
+
+
+
+
+
+    <h5>Parameters:</h5>
+    
+
+<table class="params">
+    <thead>
+    <tr>
+        
+        <th>Name</th>
+        
+
+        <th>Type</th>
+
+        
+
+        
+
+        <th class="last">Description</th>
+    </tr>
+    </thead>
+
+    <tbody>
+    
+
+        <tr>
+            
+                <td class="name"><code>script</code></td>
+            
+
+            <td class="type">
+            
+                
+<span class="param-type">string</span>
+
+
+            
+            </td>
+
+            
+
+            
+
+            <td class="description last">script to be executed on the frontend</td>
+        </tr>
+
+    
+
+        <tr>
+            
+                <td class="name"><code>params</code></td>
+            
+
+            <td class="type">
+            
+                
+<span class="param-type">Array.&lt;?></span>
+
+
+            
+            </td>
+
+            
+
+            
+
+            <td class="description last">list of parameters to the anonymous function to be sent to frontend</td>
+        </tr>
+
+    
+    </tbody>
+</table>
+
+
+
+
+
+
+<dl class="details">
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+
+    
+    <dt class="tag-source">Source:</dt>
+    <dd class="tag-source"><ul class="dummy"><li>
+        <a href="services_backend_script_api.js.html">services/backend_script_api.js</a>, <a href="services_backend_script_api.js.html#line543">line 543</a>
+    </li></ul></dd>
+    
+
+    
+
+    
+
+    
+</dl>
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<h5>Returns:</h5>
+
+        
+<div class="param-desc">
+    - no return value is provided.
+</div>
+
+
+
+<dl>
+    <dt>
+        Type
+    </dt>
+    <dd>
+        
+<span class="param-type">undefined</span>
+
+
+    </dd>
+</dl>
+
+    
+
+
+
+
+
+        
+            
+
+    
+
+    
     <h4 class="name" id="searchForNote"><span class="type-signature"></span>searchForNote<span class="signature">(query, searchParams<span class="signature-attributes">opt</span>)</span><span class="type-signature"> &rarr; {<a href="BNote.html">BNote</a>|null}</span></h4>
     
 

docs/backend_api/services_backend_script_api.js.html

@@ -557,6 +557,48 @@ function BackendScriptApi(currentNote, apiParams) {
      */
     this.exportSubtreeToZipFile = async (noteId, format, zipFilePath) => await exportService.exportToZipFile(noteId, format, zipFilePath);
 
+    /**
+     * Executes given anonymous function on the frontend(s).
+     * Internally this serializes the anonymous function into string and sends it to frontend(s) via WebSocket.
+     * Note that there can be multiple connected frontend instances (e.g. in different tabs). In such case, all
+     * instances execute the given function.
+     *
+     * @method
+     * @param {string} script - script to be executed on the frontend
+     * @param {Array.<?>} params - list of parameters to the anonymous function to be sent to frontend
+     * @returns {undefined} - no return value is provided.
+     */
+    this.runOnFrontend = async (script, params = []) => {
+        if (typeof script === "function") {
+            script = script.toString();
+        }
+
+        ws.sendMessageToAllClients({
+            type: 'execute-script',
+            script: script,
+            params: prepareParams(params),
+            startNoteId: this.startNote.noteId,
+            currentNoteId: this.currentNote.noteId,
+            originEntityName: "notes", // currently there's no other entity on the frontend which can trigger event
+            originEntityId: this.originEntity?.noteId || null
+        });
+
+        function prepareParams(params) {
+            if (!params) {
+                return params;
+            }
+
+            return params.map(p => {
+                if (typeof p === "function") {
+                    return `!@#Function: ${p.toString()}`;
+                }
+                else {
+                    return p;
+                }
+            });
+        }
+    };
+
     /**
      * This object contains "at your risk" and "no BC guarantees" objects for advanced use cases.
      *