My Page

How to show images with a click in JavaScript using HTML?

Showing images with a click in JavaScript is a common technique used in web development to create image galleries, slideshows, and other types of image−based applications. It allows users to navigate between images by clicking on buttons or other elements in the user interface, rather than using a static set of images that are always visible.

To show images with a click in JavaScript, you can use a combination of HTML, CSS, and JavaScript to define the structure and appearance of the image elements, and to specify the behavior of the buttons or other elements that will be used to navigate between the images.

In HTML, you can use the img element to define the image elements, and the style attribute to specify the CSS styles that will be applied to the images. You can also use the src attribute to specify the source of the images, and the alt attribute to provide a text alternative for users who cannot see the images.

In CSS, you can use the display property and a class name to hide and show the images as needed.

In JavaScript, you can use the querySelectorAll method to select the image elements, and the addEventListener method to attach click event listeners to the button or navigation elements. In the event listener functions, you can use the classList property of the image elements to add and remove the class that controls their visibility, and you can use a loop or an array of image elements to iterate over the images and update their class names as needed.

Approach 1: Using the Style Display Property

To show images with a click in JavaScript using HTML, you can use the display property of the style object to hide and show the images as needed.

Syntax

Following is the syntax to display images using the display property in JavvaScript −

myImage.style.display = "block";

Here «display» property of myImage is set to «block«.

Steps

Here are the steps you can follow to show an image with a click in JavaScript using HTML −

• Step 1 − Create an HTML file with a button element and an image element.
• Step 2 − In the image element, use the style attribute to set the display property to «none». This will hide the image by default.
• Step 3 − In the JavaScript code, use the getElementById method to select the button and image elements.
• Step 4 − Use the addEventListener method to attach a click event listener to the button element.
• Step 5 − In the event listener function, use the style.display property of the image element to change its value from «none» to «block». This will make the image visible.

By following these steps, you can create a simple image gallery or slideshow that allows users to show and hide images by clicking on a button or other element in the user interface

Example

Here’s an example of how you might do this:

     
Showing image with a click in JavaScript
 Show Image      

In this example, the HTML file defines a button and an image. The image is initially hidden by setting the display property of the style object to «none». The JavaScript code uses the addEventListener method to attach a click event listener to the button, and the event listener function shows the image by setting the display property to «block». When the button is clicked, the image will be displayed.

You can customize this behavior as needed depending on your specific requirements. For example, you might want to show multiple images or toggle the visibility of the image when the button is clicked. You can also use other methods to show and hide the image, such as using the visibility property or adding and removing a class that applies the appropriate styling.

Approach 2: Using the classList.toggle Method

This approach allows you to use CSS classes to control the visibility of the image, which can be useful if you want to apply other styles or animations to the image when it is shown or hidden. You can customize the behavior as needed by adding or modifying the CSS classes and by adjusting the logic in the event listener function.

Syntax

Following is the syntax to use classList.toggle method to show image with aclick in JavaScript −

myImage.classList.toggle("visible");

Here myImage is set to visible.

Example

In the example below, we show images with a click using classList.toggle mwthod in JavaScript −

     
Showing image with a click in JavaScript
 Show Image  .hidden < display: none; >.visible    

In this example, the HTML file defines a button and an image, and the image is initially hidden using a CSS class called hidden. The JavaScript code uses the addEventListener method to attach a click event listener to the button, and the event listener function toggles the visibility of the image by using the classList.toggle method to add or remove the visible class. When the button is clicked, the visible class will be added to the image, causing it to be displayed. If the button is clicked again, the visible class will be removed, causing the image to be hidden again.

Approach 3: Using Hidden Attribute

This approach is simple and easy to use, and it allows you to control the visibility of the image using a standard HTML attribute. You can customize the behavior as needed by adjusting the logic in the event listener function.

Syntax

Following is the syntax to show an image using hidden attribute:

myImage.hidden = !myImage.hidden;

Here the hidden attribute of myImage is set to true.

Example

In this example we show image with a click using hidden attribute of the image in JavaScript −

     
Showing image with a click in JavaScript
 Show Image      

In this example, the HTML file defines a button and an image, and the image is initially hidden using the hidden attribute. The JavaScript code uses the addEventListener method to attach a click event listener to the button, and the event listener function toggles the visibility of the image by using the hidden attribute to show or hide the image. When the button is clicked, the hidden attribute will be set to false, causing the image to be displayed. If the button is clicked again, the hidden attribute will be set to true, causing the image to be hidden again.

Note that the hidden attribute is supported in modern browsers, but it may not be supported in older browsers. If you need to support older browsers, you might want to use one of the other approaches that I mentioned earlier, such as using the style.display property or CSS classes.

Источник

How to work with document.images in JavaScript?

Disclaimer: I work for Bytescout Unfortunately PDF.js not working with images and that is why we developed PDF Generator SDK for Javascript (free for non-commercial use) where you can add image (from url or canvas) like this: Important to say that you can face limitation on image size as BytescoutPDF.js may consumes memory to process large image (this issue is caused by the memory limitations for javascript). Implementation: Step 1: Creating a blank document Step 2: Creating a Paragraph Step 3: Creating a File output stream of word document at the required location Step 4: Creating a file input stream of the image by specifying its path Step 5: Retrieving the image file name and image type Step 6: Setting the width and height of the image in pixels Step 7: Adding the picture using the addPicture() method and writing into the document Step 8: Closing the connections Sample input image: Before implementation Example: JavaOutput:

How to work with document.images in JavaScript?

Use the document.images property in JavaScript to get the number of tags in a document.

Example

You can try to run the following code to implement document.images property in JavaScript.

     
TutorialsPoint Tutorials
   
     

PDF.js Inserting Images

I’ve started using PDF.js, an excelent work, by the way.

But now I want to insert an image (from a canvas element) on the pdf page. Here’s my code:

var image = myCanvas.getContext('2d').getImageData(0,0,400,300), doc = new pdf(); doc.setProperties(< title: fileName, author: 'VirtuaLab®', creator: 'pdf.js' >); doc.addPage(); data = doc.output(); 

But I haven’t found anything about inserting images on pdf.js pages.

Maybe doc.image() or doc.addImage ?

Disclaimer: I work for Bytescout

Unfortunately PDF.js not working with images and that is why we developed PDF Generator SDK for Javascript (free for non-commercial use) where you can add image (from url or canvas) like this:

// load image from local file pdf.imageLoadFromUrl('image1.jpg'); // place this mage at given X, Y coordinates on the page pdf.imagePlace(20, 40); 

Important to say that you can face limitation on image size as BytescoutPDF.js may consumes memory to process large image (this issue is caused by the memory limitations for javascript).

However the script should work fine in case you just need to insert logo image or small picture into generated pdf.

UPDATE : the latest version of jsPDF (not to be confused with PDF.js) seems to work with images, see the sample on examples page.

If I understand your question correctly you want to use an instead of a with pdf.js.

So here is my fix for this problem, insert the returned image in a canvas as normal, give the canvas a display: none; .

Then use the .toDataURL() method of the canvas element to get a src for your img.

var canvas = document.getElementById("myCanves"); var img = document.getElementById("myImg"); img.src = canvas.toDataURL(); 

HTML DOM Document images Property, W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

Adding Images to a Word Document using Java

Java makes it possible to add images to word documents using the addPicture() method of xwpfrun class provided by Apache POI package. Apache POI is a popular API developed and maintained by the Apache Software Foundation. It provides several classes and methods to perform different file operations on Microsoft office files using Java. In order to attach an image to a word document, the basic necessity is to import the following library of Apache.

• addPicture(): Helps in attaching the image to overall file. It is defined as follows:

run.addPicture(java.io.InputStream imageData,int imageType,java.lang.String imageFileName,int width,int height)

• imageData: The raw picture data
• imageType: The type of the picture, eg xwpfdocument.PICTURE_TYPE_JPEG
• imageFileName: Name of the image file
• width: width in EMUs
• height: height in EMUs

1. Create a Blank document using XWPFDocument of Apache POI package.
2. Create a paragraph using the createParagraph() method of XWPFParagraph object.
3. Create FileOutputStream and FileInputStream of Word and Image respectively.
4. Create XWPFRun object and add the picture using addPicture() method.

Implementation:

• Step 1: Creating a blank document
• Step 2: Creating a Paragraph
• Step 3: Creating a File output stream of word document at the required location
• Step 4: Creating a file input stream of the image by specifying its path
• Step 5: Retrieving the image file name and image type
• Step 6: Setting the width and height of the image in pixels
• Step 7: Adding the picture using the addPicture() method and writing into the document
• Step 8: Closing the connections

Sample input image: Before implementation

Источник