removeEmptyItem Property

Summary

Indicates whether to remove the item if it did not have previous data.

Syntax
TypeScript
JavaScript
Object.defineProperty(ImageViewerItemErrorEventArgs.prototype, 'removeEmptyItem', 
	get: function(), 
	set: function(value) 
) 
removeEmptyItem: boolean; 

Property Value

true to remove the item if it did not have previous data, otherwise, false. Default value is false.

Remarks

The detailed description refer to ItemError.

Example
ItemChanged.ts
ImageViewer.ts
ItemChanged.js
ImageViewer.js
ItemChanged.html
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewer_ItemChangedExample { 
   private viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   private run = (viewer: lt.Controls.ImageViewer) => { 
      viewer.itemBorderThickness = 5; 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
 
      const itemChangeReasons: string[] = ["size", "transform", "enabled", "selected", "hovered", 
         "text", "url", "drop", "drag", "image", "imageChanged", "floater", 
         "floaterTransform", "backImageUrl", "backImage"]; 
 
      // Clear the items and add new items 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
      for (let i = 0; i < 2; i++) { 
         const item: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem(); 
         item.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
         item.text = "Item " + i; 
         viewer.items.add(item); 
      } 
      viewer.endUpdate(); 
 
      const output = document.getElementById("output"); 
 
      viewer.itemChanged.add((sender, e) => { 
         let item = e.item; 
 
         const lines: string[] = [ 
            "Item Changed: " + viewer.items.indexOf(item), 
            "Reason: " + itemChangeReasons[e.reason], 
            "Item Text: " + item.text, 
            "Url: " + item.url, 
         ]; 
         output.innerHTML = lines.map((line) => { return "<p>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML; 
      }); 
 
      viewer.itemError.add((sender, e) => { 
         const item: lt.Controls.ImageViewerItem = e.item; 
 
         const lines: string[] = [ 
            "Item Errored: " + viewer.items.indexOf(item), 
            "Reason: " + itemChangeReasons[e.reason], 
            "Url: " + item.url, 
         ]; 
         output.innerHTML = lines.map((line) => { return "<p style='color: red;'>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML; 
      }); 
 
      // After a second, change 
      setTimeout(() => { 
         // Set a new valid URL and change the text (two different changes) 
         const item0: lt.Controls.ImageViewerItem = viewer.items.item(0); 
         item0.url = "https://demo.leadtools.com/images/png/pngimage.png"; 
         item0.text = "Item 0 Text Changed"; 
 
         // Set an invalid URL 
         const item1: lt.Controls.ImageViewerItem = viewer.items.item(1); 
         item1.url = "https://demo.leadtools.com/thisisnotavalidimage.png"; 
      }, 1000); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   protected imageViewer: lt.Controls.ImageViewer = null; 
   // Generic state value used by the examples 
   public timesClicked: number = 0; 
 
   constructor(callback?: (viewer: lt.Controls.ImageViewer) => void) { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
 
      // Create an image viewer inside the imageViewerDiv element 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions: lt.Controls.ImageViewerCreateOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
      this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.autoCreateCanvas = true; 
 
      // Add Pan/Zoom interactive mode 
      // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
 
      // Load an image 
      this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
 
      this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.addEventListener("click", () => { 
         this.timesClicked++; 
         // Run the example 
         if (callback) 
            callback(this.imageViewer); 
      }); 
   } 
} 
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewer_ItemChangedExample { 
   viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   run = (viewer) => { 
      viewer.itemBorderThickness = 5; 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
 
      const itemChangeReasons = ["size", "transform", "enabled", "selected", "hovered", 
         "text", "url", "drop", "drag", "image", "imageChanged", "floater", 
         "floaterTransform", "backImageUrl", "backImage"]; 
 
      // Clear the items and add new items 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
      for (let i = 0; i < 2; i++) { 
         const item = new lt.Controls.ImageViewerItem(); 
         item.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
         item.text = "Item " + i; 
         viewer.items.add(item); 
      } 
      viewer.endUpdate(); 
 
      const output = document.getElementById("output"); 
 
      viewer.itemChanged.add((sender, e) => { 
         let item = e.item; 
 
         const lines = [ 
            "Item Changed: " + viewer.items.indexOf(item), 
            "Reason: " + itemChangeReasons[e.reason], 
            "Item Text: " + item.text, 
            "Url: " + item.url, 
         ]; 
         output.innerHTML = lines.map((line) => { return "<p>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML; 
      }); 
 
      viewer.itemError.add((sender, e) => { 
         const item = e.item; 
 
         const lines = [ 
            "Item Errored: " + viewer.items.indexOf(item), 
            "Reason: " + itemChangeReasons[e.reason], 
            "Url: " + item.url, 
         ]; 
         output.innerHTML = lines.map((line) => { return "<p style='color: red;'>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML; 
      }); 
 
      // After a second, change 
      setTimeout(() => { 
         // Set a new valid URL and change the text (two different changes) 
         const item0 = viewer.items.item(0); 
         item0.url = "https://demo.leadtools.com/images/png/pngimage.png"; 
         item0.text = "Item 0 Text Changed"; 
 
         // Set an invalid URL 
         const item1 = viewer.items.item(1); 
         item1.url = "https://demo.leadtools.com/thisisnotavalidimage.png"; 
      }, 1000); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   imageViewer = null; 
   // Generic state value used by the examples 
   timesClicked = 0; 
 
   constructor(callback) { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
 
      // Create an image viewer inside the imageViewerDiv element 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
      this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.autoCreateCanvas = true; 
 
      // Add Pan/Zoom interactive mode 
      // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
 
      // Load an image 
      this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
 
      this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.addEventListener("click", () => { 
         this.timesClicked++; 
         // Run the example 
         if (callback) 
            callback(this.imageViewer); 
      }); 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>Controls Example | ItemChanged</title> 
 
<head> 
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" 
      integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> 
 
   <script src="../../LT/Leadtools.js"></script> 
   <script src="../../LT/Leadtools.Controls.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Engine.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Designers.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Rendering.Javascript.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Automation.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Main.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Color.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Core.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Effects.js"></script> 
   <script src="../../LT/Leadtools.Document.js"></script> 
   <script src="../../LT/Leadtools.Document.Viewer.js"></script> 
   <style> 
      body { 
         font-family: 'Segoe UI', sans-serif; 
      } 
 
      #imageViewerDiv { 
         border: 1px solid #888; 
         width: 500px; 
         height: 500px; 
         background-color: #eee; 
      } 
   </style> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <p>Press and drag on the image to pan.</p> 
   <p>Hold down the control key and press and drag on the image or pinch with two fingers to zoom in and out.</p> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="imageViewerDiv"></div> 
   <div id="output"></div> 
</body> 
 
<script> 
   window.onload = () => { 
      const example = new window.examples.ImageViewer.ItemChanged(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 22.0.2023.2.4
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Controls Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.