getImageUrl Method (original) (raw)
Summary
Gets a URL to the raster image for this page.
Syntax
DocumentPage.prototype.getImageUrl = function() Return Value
A string representing the URL to the raster image for this page.
Example
This example will load a PDF document and then load a page into a HTML Image element.
GetImageUrl.ts
DocumentHelper.ts
GetImageUrl.js
DocumentHelper.js
GetImageUrl.html
import { DocumentHelper } from "../../utilities/DocumentHelper";
export class DocumentPage_GetImageUrlExample {
private imgEle: HTMLElement;
public constructor() {
lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null);
DocumentHelper.initFactory();
}
public run = (buttonID: string, imgID: string) => {
const exampleButton = document.getElementById(buttonID);
exampleButton.onclick = this.onClick;
this.imgEle = document.getElementById(imgID);
console.log(this.imgEle);
}
onClick = () => {
//Load the initial document
const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf";
const img = (this.imgEle as HTMLImageElement);
DocumentHelper.log("Loading document...");
lt.Document.DocumentFactory.loadFromUri(url, null)
.done((doc) => {
DocumentHelper.log("Done.");
const pageNumber = 2;
const docPage = doc.pages.item(pageNumber - 1);
// Instead of loading through the Documents Library, use an img ourselves
const pageImageUrl = docPage.getImageUrl();
img.onload = () => {
DocumentHelper.log("Loaded!");
};
img.onerror = () => {
DocumentHelper.log("Failed.");
};
DocumentHelper.log("Loading: " + pageImageUrl);
img.src = pageImageUrl;
})
.fail(DocumentHelper.showServiceError);
}
}
export class DocumentHelper {
static showServiceError = (jqXHR, statusText, errorThrown) => {
alert("Error returned from service. See the console for details.");
const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown);
console.error(serviceError);
}
static log = (message: string, data?: any) => {
const outputElement = document.getElementById("output");
if (outputElement) {
const time = (new Date()).toLocaleTimeString();
const textElement = document.createElement("p");
textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message;
outputElement.insertBefore(textElement, outputElement.firstChild);
}
if (!data)
console.log(message);
else
console.log(message, data);
}
static initFactory = () => {
// To communicate with the DocumentsService, it must be running!
// Change these parameters to match the path to the service.
lt.Document.DocumentFactory.serviceHost = "http://localhost:40000";
lt.Document.DocumentFactory.servicePath = "";
lt.Document.DocumentFactory.serviceApiPath = "api";
}
}
import { DocumentHelper } from "../../utilities/DocumentHelper";
export class DocumentPage_GetImageUrlExample {
imgEle;
constructor() {
lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null);
DocumentHelper.initFactory();
}
run = (buttonID, imgID) => {
const exampleButton = document.getElementById(buttonID);
exampleButton.onclick = this.onClick;
this.imgEle = document.getElementById(imgID);
console.log(this.imgEle);
}
onClick = () => {
//Load the initial document
const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf";
const img = this.imgEle;
DocumentHelper.log("Loading document...");
lt.Document.DocumentFactory.loadFromUri(url, null)
.done((doc) => {
DocumentHelper.log("Done.");
const pageNumber = 2;
const docPage = doc.pages.item(pageNumber - 1);
// Instead of loading through the Documents Library, use an img ourselves
const pageImageUrl = docPage.getImageUrl();
img.onload = () => {
DocumentHelper.log("Loaded!");
};
img.onerror = () => {
DocumentHelper.log("Failed.");
};
DocumentHelper.log("Loading: " + pageImageUrl);
img.src = pageImageUrl;
})
.fail(DocumentHelper.showServiceError);
}
}
export class DocumentHelper {
static showServiceError = (jqXHR, statusText, errorThrown) => {
alert("Error returned from service. See the console for details.");
const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown);
console.error(serviceError);
}
static log = (message, data) => {
const outputElement = document.getElementById("output");
if (outputElement) {
const time = (new Date()).toLocaleTimeString();
const textElement = document.createElement("p");
textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message;
outputElement.insertBefore(textElement, outputElement.firstChild);
}
if (!data)
console.log(message);
else
console.log(message, data);
}
static initFactory = () => {
// To communicate with the DocumentsService, it must be running!
// Change these parameters to match the path to the service.
lt.Document.DocumentFactory.serviceHost = "http://localhost:40000";
lt.Document.DocumentFactory.servicePath = "";
lt.Document.DocumentFactory.serviceApiPath = "api";
}
}
<!doctype html>
<html lang="en">
<title>Document Example | GetImageUrl</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>
<link rel="stylesheet" type="text/css" href="../../css/examples.css">
<!-- All demo files are bundled and appended to the window -->
<script src="../../bundle.js" type="text/javascript"></script>
</head>
<body>
<div>
<button type="button" id="exampleButton">Run Example</button>
</div>
<div id="output"></div>
<div>
<img id="img" />
</div>
</body>
<script>
window.onload = () => {
const example = new window.examples.DocumentPage.GetImageUrl();
example.run("exampleButton", 'img');
};
</script>
</html>