Question

我使用visual studio和this教程中的基本网格示例创建简单的网格应用程序。我预计这个动画将适用于所有项目，但它似乎只适用于第一个。我的问题是，我如何在所有项目上设置动画？如果可以随机动画（不是一次全部动画！例如：Windows 8开始菜单）。

项目模板：

<div class="itemtemplate" data-win-control="WinJS.Binding.Template">
    <div class="item">
        <img class="item-image" src="#" data-win-bind="src: backgroundImage; alt: title" />
        <img class="item-image-new" src="#" data-win-bind="src: backgroundImage; alt: title" />
        <div class="item-overlay">
            <h4 class="item-title" data-win-bind="textContent: title"></h4>
            <h6 class="item-subtitle win-type-ellipsis" data-win-bind="textContent: subtitle"></h6>
        </div>
    </div>
</div>

Js动画：

var darkGray = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXY3B0cPoPAANMAcOba1BlAAAAAElFTkSuQmCC";
var lightGray = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXY7h4+cp/AAhpA3h+ANDKAAAAAElFTkSuQmCC";
var mediumGray = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXY5g8dcZ/AAY/AsAlWFQ+AAAAAElFTkSuQmCC";

// Play the Peek animation
function peekTile(tile1, tile2) {
    // Create peek animation
    var peekAnimation = WinJS.UI.Animation.createPeekAnimation([tile1, tile2]);

    // Reposition tiles to their desired post-animation position
    tile1.style.top = "-250px";
    tile2.style.top = "0px";

    // Execute animation
    peekAnimation.execute();
}

function changeImage() {
    // Get the two image elements
    var images = document.querySelector(".item-image");
    var imagesNew = document.querySelector(".item-image-new");

    // Swap out the old image source and choose the new image source
    images.src = imagesNew.src;
    if (images.src == lightGray)
        imagesNew.src = mediumGray;
    else if (images.src == mediumGray)
        imagesNew.src = darkGray;
    else
        imagesNew.src = lightGray;

    // Reset the elements for the pre-animation position and trigger the animation
    images.style.top = "0px";
    imagesNew.style.top = "250px";
    peekTile(images, imagesNew);
};

和间隔，改变图像（它写在准备功能内）：

setInterval(function () { changeImage() }, 4000);

Answer 1

当你致电document.querySelector时，它只会返回第一个匹配的元素，在你的情况下，它将是第一个列表项。如果您想为任意随机项目制作动画，只需拨打document.querySelectorAll(".item")，从结果列表中选择一个随机项目，然后在其上调用querySelector('.item-image')，按照您目前的步骤进行操作。

ListView项目动画 - Windows商店应用程序

1 个答案: