动画模糊滤镜 [英] Animate blur filter

问题描述

是否可以使用jQuery为CSS3模糊滤镜设置动画?

Is it possible to animate the CSS3 blur filter using jQuery?

这是应用CSS规则的静态方法:

This works as a static way of applying CSS rules :

item.css({'filter': 'blur('+blur+')','-webkit-filter': 'blur('+blur+')','-moz-filter': 'blur('+blur+')','-o-filter': 'blur('+blur+')','-ms-filter': 'blur('+blur+')'});

但是当我用animate方法替换css方法时，什么也没发生.

but when I replace the css method with the animate method, nothing happens.

item.animate({'filter': 'blur('+blur+')','-webkit-filter': 'blur('+blur+')','-moz-filter': 'blur('+blur+')','-o-filter': 'blur('+blur+')','-ms-filter': 'blur('+blur+')'},500);

我不知道有什么窍门吗?如何为物品的模糊度设置动画?

Is there a trick I'm unaware of? How can I animate the blurriness of an item?

推荐答案

您可以对具有数值的变量使用.animate()函数，并进行相应的动画处理-在每个步骤中调用一个函数并分配新的数值作为CSS过滤器的模糊半径属性:)

You can use the .animate() function on a variable that is of numerical value, and animate accordingly - call a function during each step and assign that new numerical value as a CSS filter blur radius property :)

$(function() {
    $({blurRadius: 0}).animate({blurRadius: 10}, {
        duration: 500,
        easing: 'swing', // or "linear"
                         // use jQuery UI or Easing plugin for more options
        step: function() {
            console.log(this.blurRadius);
            $('.item').css({
                "-webkit-filter": "blur("+this.blurRadius+"px)",
                "filter": "blur("+this.blurRadius+"px)"
            });
        }
    });
});

---

次要更新:如另一个在下面回答.在这种情况下，链接回调以将模糊半径手动设置为预期的最终值总是更安全.我已经对这些函数进行了模块化，以便可以在没有太多冗余的情况下对其进行重用:

---

Minor update: jQuery's .animate() might not tween to the final value correctly, as noted in another answer below. In this case, it is always safer to chain a callback that manually sets the blur radius to the intended final value. I have modularised the functions so that it can be reused without too much redundancies:

$(function() {
        // Generic function to set blur radius of $ele
    var setBlur = function(ele, radius) {
            $(ele).css({
               "-webkit-filter": "blur("+radius+"px)",
                "filter": "blur("+radius+"px)"
           });
       },

       // Generic function to tween blur radius
       tweenBlur = function(ele, startRadius, endRadius) {
            $({blurRadius: startRadius}).animate({blurRadius: endRadius}, {
                duration: 500,
                easing: 'swing', // or "linear"
                                 // use jQuery UI or Easing plugin for more options
                step: function() {
                    setBlur(ele, this.blurRadius);
                },
                callback: function() {
                    // Final callback to set the target blur radius
                     // jQuery might not reach the end value
                     setBlur(ele, endRadius);
                }
            });
        };

    // Start tweening
    tweenBlur('.item', 0, 10);
});

您可以在下面的附加代码段中看到此更新的代码的运行情况.

You can see this updated code in action in the attached code snippet below.

请务必注意， Firefox (FF≥35及以上 不支持用于CSS3过滤器，因此无需使用-moz-，-ms-或-o-前缀:)

It is important to note that Firefox (FF ≥35 and above supports unprefix CSS filters), IE and Opera has no support for CSS3 filters, so there is no need to use -moz-, -ms- or -o- prefixes :)

请参阅小提琴: http://jsfiddle.net/teddyrised/c72Eb/(在更新之前)

See fiddle: http://jsfiddle.net/teddyrised/c72Eb/ (prior to update)

有关最新示例，请参见下面的代码段:

See code snippet below for the most up-to-date example:

$(function() {
        // Generic function to set blur radius of $ele
    var setBlur = function(ele, radius) {
            $(ele).css({
               "-webkit-filter": "blur("+radius+"px)",
                "filter": "blur("+radius+"px)"
           });
       },
       
       // Generic function to tween blur radius
       tweenBlur = function(ele, startRadius, endRadius) {
            $({blurRadius: startRadius}).animate({blurRadius: endRadius}, {
                duration: 500,
                easing: 'swing', // or "linear"
                                 // use jQuery UI or Easing plugin for more options
                step: function() {
                    setBlur(ele, this.blurRadius);
                },
                complete: function() {
                    // Final callback to set the target blur radius
                    // jQuery might not reach the end value
                    setBlur(ele, endRadius);
               }
           });
        };
    
    // Start tweening towards blurred image
    window.setTimeout(function() {
        tweenBlur('.item', 0, 10);
    }, 1000);
    
    // Reverse tweening after 3 seconds
    window.setTimeout(function() {
        tweenBlur('.item', 10, 0);
    }, 3000);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="item">
    <p>Sample text that will be blurred.</p>
    <img src="http://placehold.it/500x500" />
</div>

这篇关于动画模糊滤镜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！