Help us understand the problem. What is going on with this article?

トップに戻るボタン

More than 3 years have passed since last update.

仕様

トップ戻るボタン。
ある程度スクロールするとボタンがfadeinする。(今回は500で設定)

HTML
<div data-trigger-pagetop="pagetop" style="opacity: 0;">
   <img src="/img/diagram/btn.png" alt="トップに戻る">
</div>
js
var pageTop = function(){
    var $trigger = $('[data-trigger-pagetop]');
    if(!$trigger.length) return; //triggerがない場合return
    $(window).on('scroll',function(){
        var now = $(window).scrollTop();
        if (now > 500){//500px以上スクロールするとボタンを表示
            $trigger.stop(true).animate({
                opacity: 1
            }, 100);//0.1秒かけてfadein
        } else {//そうでない時はボタンを非表示
            $trigger.stop(true).animate({
                opacity: 0
            }, 100);//0.1秒かけてfadeout
        }
    });
    $trigger.on('click',function(){
        $('html,body').animate( {scrollTop:0} , 'slow' );
    });
};
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