We are developing a web application using Oracle ADF. Our application has a page with the following image
We need to implement Image Mapping functionality which is available in normal HTML. Means the above image should be multi-clickable. For example when user clicks Business Value Health part, I need to show some description and if user clicks Operations Health part, I need to show some other description.
How do I make this image multi-clickable in ADF?
You won't have such feature directly from ADF, but you can decompose the big image into 13 smaller images where each image can have it's own link.
Of course, you then will need to assemble big image from css and that requires a bit of CSS knowledge.
Related
Is it possible to resize images on the fly and cache the result with Drupal?
I have some big images (e.g. 2000x2000px) and I want to display a preview of the e.g. 100x100px.
I know there is a theme_image_style function. But it seams to only create the <img> with the right size and not effectively resize the image.
I look at modules/images/image.admin.inc and they used the function [image_style_create_derivative][2].
Yes, you should use Drupal's Image styles (Configuration -> Media -> Image styles). There you should create your style.
Then, on front-end, when ever you want to display image with that style (in that resolution) you can use image_style_url() function:
https://api.drupal.org/api/drupal/modules!image!image.module/function/image_style_url/7
It accepts 2 parameters - one is image style machine name and other is image URI, which you can get if you print out all image field properties.
You can also select image styles from back-end interface...i.e. when creating a view for some image you can select to be displayed in specific image style.
In both cases those image styles are generated the first time image is used.
In response to your comment on MilanG's answer, using image_style_url() is the best option on the backend. There is also
https://www.drupal.org/project/resp_img
which may be something worth looking into. From a UX perspective, you don't want to force the user to load a 2000x2000 px image every time they load the page. Regardless of the outputted size, the image is still going to render as a 2000x2000 px image with a large size. image_style_url() or using image styles in the GUI create a new file that will load much quicker and is the preferred method.
Yesterday, I saw a tweet saying about holderJS library. When I read the usage, it says it will generate the image placeholder completely on client side. So I am wondering why in the life would I need a placeholder library?
What is the scenario in which rather than placing div of some size I would use image placeholder?
Image placeholders are generally meant for a page that is either in the process of dynamically loading a real image or the page is only partially designed and the placeholder image shows how the design will be laid out and how big the image should be even though the real image is not yet available. In this way, the HTML design can be nearly completed even though the final images are not yet available or done.
Wikipedia uses image placeholders when they know they want a particular image in a page, but are in search of an image they can use with the appropriate license.
Image placeholders are traditionally served up by a service on the web that automatically creates the placeholder images based on query parameters in a URL, but the holder.js library creates placeholder images entirely on the client (so no outside services are needed).
You can certainly achieve the same look as a placeholder with just a div with a background color and perhaps even some text in the div. But, when someone wanted to plug the final images into place, they would have the change the div tags to img tags. When using a placeholder image, all the HTML tags can be final and left as they are, only the .src values need to be plugged in to finish the design. So, placeholder images allow you to have a closer to complete version of the HTML even though the images are not yet done. It's a minor different, but one that is appreciated by some designers.
My site have 2 pages and the 2 pages contain a similar picture. If a user comes to the first page, he downloads the picture and then come to the second page, if I make the website so that the picture is shared between the 2 pages then the user no need to download the picture again?
If I want to put the same picture but different in size on the webpage, is it better to make 2 pictures by using image software editor or using CSS to change the width and the height of the picture?
you have answered your question.
if the image is from the same source, and if you have configured the caching on webserver correctly (and if the client has enabled cache), then there are no re-requests sent to view the same resource.
you dont need to create multiple images for different sizes, use html image attributes to show it in the grid dimensions you wish to.
Exception: if the original image is quite large, and you are not sure if the user will want to view the image, then create smaller image for faster loading. Thumbnails on a photo album is a good example for that. There is a program called re-sizer which accepts a folder and create a new set of images with the required dimensions
Resources below
Image Resizer
HTTP Compression
I have a web application running on local host. The requirement is to load multiple rectangular jpg images (96 images, average 7k in size each) and show on home page when it runs. Images are showed in a grid of 8x12 rows/columns. I am loading image by setting the 'src' attribute of the 'img' in javascript. The url assigned to the 'src' attribute is same for all images but the image id is different. Images are loading but the main issue is that they are not loading very quickly and they are some what loading in a sequence means 1,2,3,4... and so on but some images are not loaded in sequence. I want to improve the performance of this page. I have tried the figure out the timings at different points like:
When call is originated form client (image src attribute is set)
When server is receiving call. (the page on server which serve individual image)
When server is about to return the image.
When on client side image is received/showed (image loaded event called in javascript)
It turned out after looking at the collected data that main time is lost between 1 and 2 above that is between the client side call is originated and server is receiving call for a particular image.
I have also tried setting parameters like maxWorkerThreads, minWorkerThreads, requestQueueLimit and maxconnection in machine.config but no significant improvement yet.
Can someone please help me in this situation as i am stuck here since many days and i am really short of time now. Desperately needs to improve the performance of these images loads.
Thanks in advance.
Since you stress the lack of time, I would advise you to try a jQuery plugin that loads images on demand. The gallery in which you load the pictures, does the user scroll in it? Or is it 1 big field?
If it's a gallery the user can scroll in, I'd strongly suggest you take a look at lazyload. What this plugin does, is it fetches the image only when it is needed. As long as it's not on the screen, it will not be loaded. For a brief example, have a look at this demo.
I hope this can help you out.
This is my scenario in brief:
I am making a restaurant's website.
The restaurant owner will upload his restaurant's plan view image.(example: http://cache.smartdraw.com/examples/content/Examples/SmartDraw/Floor_Plans/Restaurant_Plans/Family_Restaurant_Plan_L.jpg) Then he will mark on the image were the tables available for booking are. These coordinates will be saved in my database.
The user on the other hand will be able to click on these points(tables) and book a table.
The image map coordinates will be created dynamically according to the points that were submitted by the restaurant owner. Therefore I cannot have an image with icons already on it.
Is there a way with which I can display some sort of icon on the image map where the coordinates are? In order to make the points visible for the user.
I can think of a few options:
Generate the image map on your server, using something like GD for PHP, and place the icons where you want them
Use Javascript/CSS to position the icons where you want the in the HTML page
Use Flash to dynamically generate the icons
I think you can use ItemizedOverlay in this case.