使用css自动调整背景图像 [英] Auto adjust background image using css
问题描述
我有以下代码用于上传背景图片
。
< input type ='file'onchange =readURL(this); />
我使用的脚本是:
function readURL(input){
pre>
if(input.files&& input.files [0]){
var reader = new FileReader();
reader.onload = function(e){
$('#myframe')
.css({
background: 'url('+ e.target.result +')left top no-repeat',
background-size:'400px 400px'
});
};
reader.readAsDataURL(input.files [0]); //显示图片uncomment this
}
}
有一个问题。如果我删除
background-size
,我想减小我上传的图片的大小和分辨率。这里$('#myframe')
是div id
此外,让我知道如何将多个
属性传递到.css()
函数。我尝试下面的代码相同,但没有效果:.css(background:transparent url('+ e.target .result +')left top no-repeat,background-size:200px 300px);
解决方案您的问题是
是一个超级属性,它重置
。background-size
,放置background-size
code> background
在您的情况下,您需要:
$('#myframe')
.css('background','transparent url('+ e.target.result +')left top no-repeat')
.css('background-size','200px 300px');
查看此帖子 background覆盖background-size
和
css
属性,你只需传递一个对象。请参阅文档 http://api.jquery.com/css/I have the following code for uploading
background image
.<input type='file' onchange="readURL(this);" />
The script I'm using is:
function readURL(input) { if (input.files && input.files[0]) { var reader = new FileReader(); reader.onload = function (e) { $('#myframe') .css({ background:'url('+e.target.result +') left top no-repeat', background-size:'400px 400px' }); }; reader.readAsDataURL(input.files[0]);//To display images uncomment this } }
There is a problem.Above code works if I remove
background-size
. I want to reduce the size and resolution of the image I'm uploading. Here$('#myframe')
isdiv id
of the the area, where I want to upload. Also, let me know how do I passmultiple
properties to.css()
function. I tried the following code for the same, but no effect:.css(background:transparent url('+e.target.result +') left top no-repeat,background-size:200px 300px);
解决方案Your problem is that
background
is a super property and it resetbackground-size
, placebackground-size
afterbackground
.So in your case you want:
$('#myframe') .css('background', 'transparent url('+e.target.result +') left top no-repeat') .css('background-size', '200px 300px');
See this post background overwrites background-size
And
css
to pass multiple properties you simply pass in an object. See documentation http://api.jquery.com/css/这篇关于使用css自动调整背景图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!