Wednesday, September 21, 2011

 

Image sizing and scraping with JQuery and Rails


I know, I know, long time no type. Not my fault, I swear! First I went travelling, then I had a buncha work to do, then I went to San Francisco TechCrunch Disrupt, all of which occupied my time. Well, I suppose, on reflection, all those things were my fault, but, um ... look, I'm back now, OK?

Back with a li'l discussion of image sizing and scraping with Rails and JQuery, for a project I can't really talk about yet. Suffice to say that sometimes I want to calculate the size of various remote images - quite a lot of them, in fact, making performance important - and sometimes I want to scrape all the images from a set of web pages.

I thought the first task was going to be tricky. And maybe it is. But fortunately, someone has solved it for me, via the totally awesome FastImage Ruby gem, for which praise should be heaped upon one sdsykes. It works exactly like advertised, which is to say, like this:


  def self.picture_info_for(url)
    return nil if url.blank?
    begin
      size = FastImage.size(url)
      return size  #[width, height]
    rescue
      logger.info "Error getting info for picture at "+url.to_s
      return Array[0,0]  #this makes sense for my app, but maybe not yours
    end
  end


So, hurrah! This meant the scraping bit was actually tricker. Sure, I could have done it all in Rails, but it's user-facing, and I didn't want the user to have to wait for a bunch of potentially sequential http requests to complete without seeing any results. I could have done it all on the client side, but parsing HTML with Javascript, even with JQuery, sounded painful and fraught with difficulties, compared to using the dead-easy Hpricot gem. So I came up with a compromise I quite like:

1. On the client side: (written using HAML, which I mostly adore)
- @image_urls.each_with_index do |url,idx|
  = link_to url, url
  %div{:id => 'page_'+idx.to_s}     

%script
  $(function() {
  - @image_urls.each_with_index do |url,idx|
    $.ajax({
    url: '/stories/scrape_images?url=#{CGI::escape(url)}',
    success: function(msg){ $('#page_#{idx}').html(msg); },
    error: function(msg){ $('#page_#idx}').html(msg); }
    });
  });

2. On the server, to first create and then respond to that client page:
  def popup_scraped_images
    start_time = Time.now
    @image_urls = []
    @seed = Seed.find(params[:seed_id])
    @seed.active_signals.each do |signal|
      next if signal.main_url.blank?
      @image_urls << signal.main_url
    end
  end

  def scrape_images
    url = params[:url]
    slash = url =~ /[^\/]\/[^\/]/
    host = slash.nil? ? "" : url[0,slash+1]
    html = ''

    page = HTTParty.get(url, :timeout => 5)
    Hpricot(page).search("//img").each do |element|
      img_src = element.attributes["src"]
      img_src = host+img_src if img_src.match(/^\//)
      html += '<img src="'+img_src+'" />' if img_src.match(/^http/)
    end
  end







Hopefully how they all interact is self-explanatory. Et voila - semi-asynchronous Rails/JQuery image scraping, handled on the server side for easy caching if need be later on.





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				Based solely on the title "Image Sizing and Scraping," it suggests the article could be about techniques or best practices for resizing images and scraping data from websites. If the content delivers comprehensive guidance, tools, and ethical considerations for these tasks, it could be valuable for web developers, data analysts, and anyone working with images or web scraping. Clarity, practical examples, and adherence to legal and ethical standards regarding data scraping would enhance the article's usefulness and credibility.   contract dispute resolution process

				
# posted by Blogger Zova Zoe : May 28, 2024 at 10:54 AM 

				 
			

			
			

				
				Image sizing and scraping are crucial techniques in web development and data analysis. Image sizing involves adjusting the dimensions of an image to meet specific requirements for web display, print, or analysis. Techniques for image sizing include CSS (Cascading Style Sheets) to control the size of images, which can be set in pixels, percentages, or other units. The `object-fit` property specifies how an image should be resized to fit its container. HTML attributes can also specify image dimensions. Tools like Photoshop, GIMP, or online editors allow for manual resizing of images. Image processing libraries like Pillow, OpenCV, and Sharp provide programmatic ways to resize images. Web scraping is the process of extracting data from websites by fetching web pages and parsing the content to retrieve specific information. Techniques for web scraping include using Python Libraries like BeautifulSoup for parsing HTML and XML documents, Scrapy as an open-source and collaborative web crawling framework for Python, and JavaScript Libraries like Puppeer for controlling Chrome or Chromium.Combining image sizing and scraping allows for downloading images from websites and resizing scraped images after downloading. Properly resizing images ensures they are optimized for performance and appearance, while web scraping enables automated data collection from web sources. Combining these techniques can be particularly useful for tasks such as creating image datasets for machine learning, archiving web content, or aggregating media for analysis.A lawyer is a professional who offers legal advice and representation in various fields, including criminal law, family law, corporate law, and intellectual property law. dui lawyer emporia va


				
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# posted by Blogger Grademiner : June 27, 2024 at 1:20 AM 

				 
			

			
			

				
				Creating mini pumpkin place card holders can involve adding visual elements like images to guides or crafts, which may require resizing and scraping images for a better presentation. Properly sized images enhance the visual appeal and load faster on websites or documents. Online tools such as Canva, PicResize, and Pixlr offer resizing with preset dimensions or custom sizes. Software like Adobe Photoshop, GIMP, and Adobe Photoshop can be used to set desired dimensions and resolution. Image resizing involves extracting images from websites, ensuring compliance with copyright laws and website policies. Online tools like DownloadGram and Image Downloader can be used to download images from Instagram and web pages. Python with BeautifulSoup and Selenium can be used to download images from various styles.how to apply for us immigration from india


				
# posted by Blogger shilton : June 29, 2024 at 1:54 AM 

				 
			

			
			

				
				Image sizing and scraping are crucial techniques for web development, data analysis, and digital content management. Image sizing involves adjusting the dimensions of an image to fit specific requirements, which is essential for web design, printing, and ensuring images load quickly and display correctly on different devices. Tools for image sizing include Canva, ResizeImage.net, PicResize, Adobe Photoshop, GIMP, Paint.NET, and ImageMagick. Best practices for image sizing include maintaining aspect ratio, optimizing for web, and using responsive design. Image scraping involves extracting images from websites for data collection, machine learning, or project content fairfax gun lawyer.

				
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				 divorce lawyer in fredericksburgThumbnails can be used for quicker loading times when working with large numbers of images. Responsive design techniques can be used to serve images based on the user's device and screen size. Batch processing tools can be used to resize multiple images simultaneously, especially when dealing with large datasets Optimizing user experience is crucial when displaying images on a website or application

				
# posted by Blogger captainmiller : July 4, 2024 at 1:07 AM 

				 
			

			
			

				
				Proficiency in picture scaling and scraping with jQuery and Rails is crucial for creating responsive websites and effectively extracting data. This combination improves backend functionality and user experience by enabling developers to receive information from websites and dynamically change graphics for different devices. essential competencies for contemporary web developers.General law encompasses rules and regulations established by governments to maintain order, protect rights, and ensure justice. It includes civil, criminal, and administrative law, governing areas like contracts, property, and personal conduct. Law serves to resolve disputes, penalize unlawful actions, and provide a framework for societal functioning, ensuring fairness and security within the community.
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				Great insights on image sizing and scraping! It's crucial for maintaining quality and efficiency in web design. On a different note, I recently came across a free cars program that helps individuals in need secure reliable transportation. It's amazing how community initiatives can make a significant difference, just as effective image management can enhance user experience. Thanks for sharing such informative content!



				
# posted by Blogger Loren Maxtern : October 1, 2024 at 11:43 PM 

				 
			

			
			

				
				Image sizing and scraping are crucial concepts in web development and data extraction. Image sizing refers to the pixel dimensions of an image, which are crucial for accurate display on different devices and screen resolutions. Responsive design involves using CSS and HTML techniques to adapt images to various screen sizes. Optimization involves compressing images without significant quality loss to improve loading times. Maintaining the aspect ratio is essential to prevent distortion during resizing. File formats like JPEG, PNG, GIF, and WebP are chosen based on the image type and usage. Web scraping is the process of extracting data from websites using scripts or tools. Popular tools for scraping include Beautiful Soup (Python), Scratch, and Selenium. It is important to respect terms of service and check a website's robots.txt file and terms of service to ensure scraping is allowed. Data extraction may involve resizing or optimizing images before storing or displaying them on the site. Image handling involves efficiently storing scraped images using proper naming conventions and directory structures.personal injury attorney virginia beach


				
# posted by Blogger Jack : October 24, 2024 at 3:55 AM 

				 
			

			
			

				
				Important ideas in web construction and data extraction include image scaling and scraping. The pixel dimensions of a picture are referred to as image scaling, and they are essential for precise display across a range of screens and devices. Reckless Driving Lawyer Warren VA. Using CSS and HTML principles, responsive design makes graphics fit different screen widths. In order to speed up loading times, optimization entails reducing image size without noticeably sacrificing quality. In order to avoid distortion during resizing, the aspect ratio must be maintained. Depending on the type of image and its intended use, file formats such as JPEG, PNG, GIF, and WebP are selected. The technique of using tools or programs to extract data from websites is known as web scraping.

				
# posted by Blogger danielalexanderda : October 24, 2024 at 6:28 AM 

				 
			

			
			

				
				Image sizing and image scraping are two distinct aspects to consider when resizing images for web or app use. Image sizing involves adjusting the dimensions (width and height) and resolution of an image to fit a specific need, such as for use on websites, mobile apps, or other media. Key considerations in image sizing include resolution (measured in DPI), dimensions (in pixels), file size (in KB, MB, etc.), and aspect ratio (the relationship between the width and height of an image). Image resizing techniques can be found online through tools like [Pixlr] or [ResizeImage.net], software tools like Adobe Photoshop or GIMP, batch resizing using tools like Adobe Lightroom or specialized batch-processing software, and responsive design by creating multiple versions of an image for different screen sizes. CSS techniques like `srcset` can be used to serve the appropriate image size based on the viewer's device.Image scraping is the process of extracting images from websites, typically using a script or a tool. Web scraping can be useful for gathering large datasets, including images for research, content aggregation, or building datasets for machine learning. Legal and ethical considerations include copyright laws and terms of service. Common techniques for image scraping include using web scraping libraries like BeautifulSoup, Requests, Selenium, and Scrapy.montgomery personal injury lawyer


				
# posted by Blogger aaranian : November 9, 2024 at 4:11 AM 

				 
			

			
			

				
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# posted by Blogger allan bennett : November 22, 2024 at 5:37 AM 

				 
			

			
			

				
				Image sizing and scraping are two essential tasks that require efficient and ethical handling. Image sizing involves resizing images for various uses, such as websites, social media, or print. Techniques for resizing images include aspect ratio maintenance, cropping, and compression. Tools for resizing include online tools like Canva, ResizeImage.net, Adobe Express, software like Photoshop, GIMP, or IrfanView, and code-based solutions like Python with libraries like Pillow or OpenCV. Common use cases include web optimization, preparing assets for social media platforms, and standardizing image sizes in data analysis or machine learning projects. Image scraping involves extracting images from websites for data collection, research, or creative projects, but must respect copyright laws and terms of service. Methods for scraping images include manual downloading, automated tools like Python with `BeautifulSoup`, Selenium for dynamic content, and APIs like Google Images API for legal and structured image retrieval. Best practices include checking permissions, throttling requests, metadata handling, and respecting copyright. Challenges include dynamic content loading via JavaScript, CAPTCHAs blocking scraping, and format issues with JPG, PNG, or WebP formats.portsmouth personal injury lawyer

				
# posted by Blogger allan bennett : November 22, 2024 at 5:39 AM 

				 
			

			
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