Home > Others

JQuery and Other proportional scaling large images (jQuery. autoIMG. min. js)

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Today we will introduce how to use jquery's jQuery. autoIMG. min plug-in to compare and scale images. I hope this tutorial will be helpful to you.

This section describes autoIMG.

AutoIMG can quickly adapt the size of the article image. It uses a browser to obtain the size data of the image file header, without waiting for the image to be loaded.

AutoIMG compatibility: Chrome | Firefox | Sifari | Opera | IE6 | IE7 | IE8 |...


Calling the autoIMG plug-in is quite simple:

 

The Code is as follows: Copy code
$ (Function (){
$ ("# Demo2"). autoIMG ();
});

See the instance below

The Code is as follows: Copy code

<Script type = "text/javascript" src = "../js/jquery. js"> </script>
<Script type = "text/javascript" src = "jQuery. autoIMG. min. js"> </script>
<Style type = "text/css">
. Demo {width: 600px; margin: 20px auto; overflow: hidden}
</Style>
<Script type = "text/javascript">
$ (Function (){
$ ("# Demo2"). autoIMG ();

Var w = $ ("# demo1"). width ();
$ ("# Demo1 img"). each (function (){
Var img_w = $ (this). width ();
Var img_h = $ (this). height ();
If (img_w> w ){
Var height = (w * img_h)/img_w;
((This).css ({"width": w, "height": height });
}
});
});
</Script>
</Head>

<Body>
<Div class = "demo">

<P> 1. known image size <a href = "images/one.jpg" target = "_ blank"> View large image </a> </p>
<Div id = "demo1">

</Div>
<P> 2. Unknown image size <a href = "/jQueryautoImg/images/two.jpg" target = "_ blank"> View large image size </a> </p>
<Div id = "demo2">
<br>
</Div>
</Div>

</Div>


Next we will analyze the instance

There are two cases:

1. known image size
 

The Code is as follows: Copy code
<Div id = "demo1">

</Div>

When the page-loaded image contains the width and height values, you can use a few simple jQuery code statements to achieve proportional scaling.

The Code is as follows: Copy code

 
$ (Function (){
Var w = $ ("# demo1"). width (); // container width
$ ("# Demo1 img"). each (function () {// if there are many images, we can use each () to traverse
Var img_w = $ (this). width (); // Image width
Var img_h = $ (this). height (); // Image height
If (img_w> w) {// if the image width exceeds the container width, the image must be broken.
Var height = (w * img_h)/img_w; // proportional height Scaling
((This).css ({"width": w, "height": height}); // you can specify the width and height of the scaled image.
}
});
});

2. Unknown image size
When the size of the image to be loaded on the page is unknown, the code above cannot be effectively scaled. In this case, more external linked images are collected.

The Code is as follows: Copy code

 
<Div id = "demo2">

</Div>

Fortunately, some kind friends have already written specialized plug-ins to handle the issue, and cross-browser solutions solve a major problem for front-end friends.

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More