Question

我想使用Tod形式Codrops为我的投资组合制作叠加层。单击缩略图时，应打开项目覆盖图。这是tut / markup / javascript：http://tympanus.net/codrops/2014/02/06/fullscreen-overlay-effects/（我使用示例编号7，'内容推送'）

但问题是'trigger-overlay'是一个id，而不是一个类，因为在tut中这个例子只使用了一个按钮。我有多个缩略图，所以我将var triggerBttn从'getElementById'更改为'getElementsByClassName'

    (function() {
    var container = document.querySelector( 'div.pagewrapper' ),
        triggerBttn = document.getElementsByClassName( 'trigger-overlay' ),
        overlay = document.querySelector( 'div.overlay' ),
        closeBttn = overlay.querySelector( 'button.overlay-close' );
        transEndEventNames = {
            'WebkitTransition': 'webkitTransitionEnd',
            'MozTransition': 'transitionend',
            'OTransition': 'oTransitionEnd',
            'msTransition': 'MSTransitionEnd',
            'transition': 'transitionend'
        },
        transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
        support = { transitions : Modernizr.csstransitions };

    function toggleOverlay() {
        if( classie.has( overlay, 'open' ) ) {
            classie.remove( overlay, 'open' );
            classie.remove( container, 'overlay-open' );
            classie.add( overlay, 'close' );
            var onEndTransitionFn = function( ev ) {
                if( support.transitions ) {
                    if( ev.propertyName !== 'visibility' ) return;
                    this.removeEventListener( transEndEventName, onEndTransitionFn );
                }
                classie.remove( overlay, 'close' );
            };
            if( support.transitions ) {
                overlay.addEventListener( transEndEventName, onEndTransitionFn );
            }
            else {
                onEndTransitionFn();
            }
        }
        else if( !classie.has( overlay, 'close' ) ) {
            classie.add( overlay, 'open' );
            classie.add( container, 'overlay-open' );
        }
    }

    triggerBttn.addEventListener( 'click', toggleOverlay );
    closeBttn.addEventListener( 'click', toggleOverlay );

})();

代码取决于classie.js

但现在我收到了错误

未捕获的TypeError：undefined不是函数

就行：

triggerBttn.addEventListener( 'click', toggleOverlay );

我在这里做错了什么？

Answer 1

我发现一个简单的问题是他们没有在＆＃34; closeBttn＆＃34;之后定义其余的变量，这段代码阻止了变量的其余部分。

错误

closeBttn = overlay.querySelector( 'button.overlay-close' );

应该是

closeBttn = overlay.querySelector( 'button.overlay-close' ),

所以最终的代码将是

var triggerBttn = document.getElementById( 'trigger-navbar' ),
        navbar = document.querySelector( 'section.navbar' ),
        closeBttn = navbar.querySelector( 'a.navbar-close' ),
        navClick = navbar.querySelector( 'section.navbar nav ul li a' ),
        transEndEventNames = {
            'WebkitTransition': 'webkitTransitionEnd',
            'MozTransition': 'transitionend',
            'OTransition': 'oTransitionEnd',
            'msTransition': 'MSTransitionEnd',
            'transition': 'transitionend'
        },
        transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
        support = { transitions : Modernizr.csstransitions };

        function toggleOverlay() {
        if( classie.has( navbar, 'open' ) ) {
            classie.remove( navbar, 'open' );
            classie.add( navbar, 'close' );
            var onEndTransitionFn = function( ev ) {
                if( support.transitions ) {
                    if( ev.propertyName !== 'visibility' ) return;
                    this.removeEventListener( transEndEventName, onEndTransitionFn );
                }
                classie.remove( navbar, 'close' );
            };
            if( support.transitions ) {
                navbar.addEventListener( transEndEventName, onEndTransitionFn );
            }
            else {
                onEndTransitionFn();
            }
        }
        else if( !classie.has( navbar, 'close' ) ) {
            classie.add( navbar, 'open' );
        }
    }

Codrops JavaScript overlay，undefined不是函数错误

1 个答案: