Vue Transition not Triggering on button click
Soy nuevo en Vue JS y estoy creando un visor de miniaturas en el que obtendré una lista de imágenes y videos como una matriz de objetos. Al principio, mostraré solo 5 elementos y cuando el usuario haga clic en el botón Superior / Inferior, quiero deslizar las miniaturas verticalmente.
He creado una codepen haciendo referencia a algunos enlaces en StackOverflow.
Estoy usando Vue Transitions y mis datos parecen ser reactivos, pero de alguna manera no puedo ver la transición suave (deslizándome hacia arriba / abajo en 100 px) cuando hago clic en los botones Superior e Inferior.
Código HTML
<div id="app" class="container-fluid">
<div class="row row-eq-height">
<div class="thumbnail-container">
<button class="up" @click="moveTop" :disabled="currentTopIndex === 0">Top</button>
<div :class="'slider' + (isSlidingToPrevious ? ' sliding-to-previous' : '')">
<transition-group name='list' tag="ul">
<li v-for="(item,index) in currentCarouselData" v-bind:key="index" class="list-item"><img :src="item.itemImage" :alt="item.itemImageAlt" /></li>
</transition-group>
</div>
<button @click="moveBottom" class="down" :disabled="currentBottomIndex === totalCount">Down</button>
</div>
</div>
<pre>
totalCount {{totalCount}}
currentTopIndex {{currentTopIndex}}
currentBottomIndex {{currentBottomIndex}}
itemsToDisplay {{itemsToDisplay}}
currentCarouselData {{currentCarouselData}}
</pre>
</div>
ódigo @CSS / LESS:
.row-eq-height {
display: flex;
ul {
list-style-type: none;
display: flex;
flex-direction: column;
overflow: hidden;
height: auto;
border: 1px solid black;
}
li {
flex: 1;
width: 64px;
height: 64px;
position: relative;
margin: 8px 0;
border: 1px solid red;
img {
max-width: 100%;
max-height: 100%;
}
}
}
.list-leave-active,
.list-enter-active {
transition: 0.5s;
}
.list-enter {
transform: translate(0, 100px);
}
.list-leave-to {
transform: translate(0, -100px);
}
.sliding-to-previous {
.list-enter {
transform: translate(0, -100px);
}
.list-leave-to {
transform: translate(0, 100px);
}
}
Javascript / Código VUE:
new Vue({
el: "#app",
data() {
return {
totalCarouselData: [{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test1"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test2"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test3"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test4"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test5"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test6"
},
{
itemImage: "https://www.publicdomainpictures.net/pictures/150000/velka/banner-header-tapete-145002399028x.jpg",
itemImageAlt: "Test7"
}
],
currentCarouselData: [],
isSlidingToPrevious: false,
totalCount: 0,
currentTopIndex: 0,
currentBottomIndex: 0,
itemsToDisplay: 5
};
},
computed: {},
mounted() {
//At first show only 5 items
this.currentCarouselData = this.totalCarouselData.slice(
this.currentTopIndex,
this.itemsToDisplay
);
//Get Total Count
this.totalCount = this.totalCarouselData.length;
//Update current bottom index
this.currentBottomIndex = this.itemsToDisplay;
},
methods: {
moveTop() {
this.isSlidingToPrevious = true;
this.currentTopIndex += 1;
this.currentBottomIndex -= 1;
this.addToTopComputedArr(this.currentBottomIndex);
},
moveBottom() {
this.isSlidingToPrevious = false;
this.currentTopIndex -= 1;
this.currentBottomIndex += 1;
this.addToBottomComputedArr(this.currentBottomIndex);
},
addToBottomComputedArr(index) {
//Splice the first item
this.currentCarouselData.splice(0, 1);
//Add the next item to the array
this.currentCarouselData.push(this.totalCarouselData[index - 1]);
},
addToTopComputedArr(index) {
//Splice the last item
this.currentCarouselData.splice(index - 1, 1);
//Add item to the beginning of the array
this.currentCarouselData.unshift(
this.totalCarouselData[index - this.itemsToDisplay]
);
}
}
});