图像调整大小以适应屏幕

时间:2010-04-02 21:02:02

标签: javascript jquery image resize

考虑到导航栏的可用空间,我创建了此代码以调整照片/图像的大小以适应屏幕。

脚本会在图像加载和导航点击时触发。

有没有人建议改善这一点并确保浏览器兼容性?

HTML

$(document).ready(function(){
 $("#photo").load(function(){
  resize();
 });

 $(".navigation img").click(function(){
  var imgPath = $(this).attr("src"); 
  $("#photo").attr({ src: imgPath });
  resize();
  return false;
       });
   });

的Javascript

resize = function() {

    var borderVt=150; //value based on css style. bottom bar + padding of photoContain
    var borderHz=40; //value based on css style photoContain padding

    $("#photo").css("width", "auto").css("height", "auto"); // Remove existing CSS
    $("#photo").removeAttr("width").removeAttr("height"); // Remove HTML attributes   

    var origSizeW = $("#photo").width();
    var origSizeH = $("#photo").height();
    var ratioVt=(origSizeW/origSizeH);
    var ratioHz=(origSizeH/origSizeW);
    var winW = $(window).width();
    var winH = $(window).height();
    var screenSizeW=Math.round(winW-borderHz);
    var screenSizeH=Math.round(winH-borderVt);

    if (origSizeW>=origSizeH){

     var newHeight = Math.round(screenSizeW*ratioHz);
     if (newHeight <= screenSizeH){
      $("#photo").css("width", screenSizeW); // Set new width
      $("#photo").css("height", newHeight);
      }
     else{
      $("#photo").css("height", screenSizeH);
      }

    }
    else{
    $("#photo").css("height", screenSizeH); // Set new height
    }
  };

6 个答案:

答案 0 :(得分:11)

我知道这个问题已经过时了,但这里是一个解决方案(虽然我确信OP的工作正常):

这个jQuery插件似乎完全符合您的需求: http://code.google.com/p/jquery-imagefit-plugin/

如果你在100%高度,100%宽度的元素上执行它: http://www.tutwow.com/htmlcss/quick-tip-css-100-height/

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="http://jquery-imagefit-plugin.googlecode.com/svn/trunk/jquery.imagefit-0.2.js"></script>
<div style="width: 100%; height: 100%">
    <img  id="h5" src="http://www.w3.org/html/logo/downloads/HTML5_Logo_512.png"/>
</div>
<script>
    jQuery('#h5').bind('load', function() {
        jQuery('div').imagefit();
    });
</script>

(演示:http://jsfiddle.net/nottrobin/9Pbdz/

答案 1 :(得分:5)

尝试使用jQuery-Backgrounder plugin。您可以调整它来做您需要的事情。这是一个例子:

<script src="jquery.backgrounder.js" type="text/javascript" charset="utf-8"></script>

<script type="text/javascript" charset="utf-8">
  $(function() {
    $('#my_background').backgrounder({element : 'body'});
  });
</script>

[...]

<div id="my_background"><img src="birthday.jpg" alt="Birthday party" /></div>

答案 2 :(得分:3)

我写了一个插件!

jQuery.fn.positionMe = function () {
    var oH = $(window).height();
    var oW = $(window).width();
    var iH = this.outerHeight();
    var iW = this.outerWidth();

    // When the image is too small so, do nothing
    if(iW>oW && iH>oH){

        // Otherwise, proportionate the image relative 
        // to its container
        if(oH/iH > oW/iW){
            this.css("width", oW);
            this.css("height", iH*(oW/iW))
        } else {
            this.css("height", oH);
            this.css("width", iW*(oH/iH));
        }

    }
    return this;
}

用法:

$("#photo").positionMe();

答案 3 :(得分:2)

我是这样做的:

 jQuery(document).ready(function($) {
      $('.wp-post-image').height($(window).height());
 });

答案 4 :(得分:1)

对我来说很好,但我建议将你的resize函数附加到jQuery的Window Resize Event处理程序。然后图像将随页面拉伸和缩小。

答案 5 :(得分:-1)

var w=window.innerWidth||document.documentElement.clientWidth||document.body.clientWidth||document.body.offsetWidth||window.screen.availWidth;
var h=window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight||document.body.offsetHeight||window.screen.availHeight;

function resize() {

    a=document.getElementsByClassName(' scale');
    for(var i=0; i<a.length; i++){

        var aW = a[i].offsetWidth;
        var aH = a[i].offsetHeight;
        var d=w/h;
        var mT, mL;

        if (d>=1.5){
            aW=w;
            aH=w-(w*(34/100));
            mT=(aH/2)*-1;   
            mL=(aW/2)*-1;   
        } else {
            aH=h;
            aW=h+(h*(66/100));
            mT=(aH/2)*-1;
            mL=(aW/2)*-1;
        }

        a[i].style.height=aH+'px';
        a[i].style.width=aW+'px';
        a[i].style.marginTop=mT+'px';
        a[i].style.marginLeft=mL+'px';  
    }
}