update

Author: Cube-J

hello-world/README.md

@@ -43,7 +43,7 @@ The second sample processes static images and returns barcode results.
 
 In this sample, an event listener is set up so that the SDK decodes any images that the user uploads.
 
-When working with the CaptureVisionRouter class for single image processing, the main method to use is [`capture`](https://officecn.dynamsoft.com:808/capture-vision/docs/web/programming/javascript/api-reference/capture-vision-router/single-file-processing.html?product=dbr&repoType=web#capture), You can find more details about this method at the link above.
+When working with the CaptureVisionRouter class for single image processing, the main method to use is [`capture`](https://dynamsoft.com/capture-vision/docs/web/programming/javascript/api-reference/capture-vision-router/single-file-processing.html?product=dbr&repoType=web#capture), You can find more details about this method at the link above.
 
 ## Hello World in Angular
 

hello-world/read-an-image.html

@@ -42,18 +42,21 @@ <h1>Hello World (Read an Image)</h1>
       // Preload "BarcodeReader" module for reading barcodes. It will save time on the initial decoding by skipping the module loading.
       Dynamsoft.Core.CoreModule.loadWasm(["DBR"]);
 
+      const input = document.querySelector("input");
       const divResultContainer = document.querySelector(
         "#div-result-container"
       );
-      
+
       const pRouter = Dynamsoft.CVR.CaptureVisionRouter.createInstance();
 
-      document.querySelector("input").onchange = async () => {
-        try{
+      input.onchange = async () => {
+        try {
+          if (!input.files[0]) return;
+
           const router = await pRouter;
           // Decode selected image with 'ReadBarcodes_SpeedFirst' template.
           const result = await router.capture(
-            this.files[0],
+            input.files[0],
             "ReadBarcodes_SpeedFirst"
           );
 
@@ -62,7 +65,8 @@ <h1>Hello World (Read an Image)</h1>
             divResultContainer.innerText += item.text + "\n";
             console.log(item.text);
           }
-        } catch(ex) {
+          if (!result.items.length) alert('No barcode found');
+        } catch (ex) {
           let errMsg = ex.message || ex;
           console.error(errMsg);
           alert(errMsg);