javascript - 获取元素的顶部位置值,然后在 JS 中为其添加百分比
问题描述
我正在尝试创建一个将 50% 添加到数组元素的“顶部”值的函数。到目前为止,我只设法检索了位置,但以像素为单位,我不确定如何将“50%”添加到这些值。我还认为必须有一种更简单的方法来实现这一目标?
const aboutTags = Array.from(document.querySelectorAll(".about-tag"));
document.querySelector(".about-personal-container").addEventListener("mouseover", function() {
const filteredTags = aboutTags.filter(tag => tag.classList.contains("personal-tag"))
const getTagPosition = filteredTags.map(tags => tags.style.top = tagPosition = window.getComputedStyle(tags).getPropertyValue('top'));
console.log(getTagPosition)
//This gives the element top position but in pixels
});
#about-section {
background: black;
height: 100vh;
position: relative;
color: white;
}
.personal-tag {
position: absolute;
top: 0;
left: 0;
margin-bottom: 10px;
transition: all 1s;
}
.personal-tag1 {
top: 5%;
left: 15%;
}
.personal-tag2 {
top: 15%;
left: 35%
}
.personal-tag3 {
top: 25%;
left: 65%
}
#about-inner-grid-wrap {
border: 1px solid blue;
width: 300px;
height: 50%;
position: absolute;
left: 40%;
top: 50%;
display: flex;
}
.about-inner-grid-tag-container {
height: 100%;
border: 1px solid white;
flex: 1;
}
<section id="about-section">
<span class="about-tag personal-tag personal-tag1">Personal tag</span>
<span class="about-tag personal-tag personal-tag2">Personal second</span>
<span class="about-tag personal-tag personal-tag3">Personal third</span>
<span class="about-tag personal-tag personal-tag4">Personal tag</span>
<span class="about-tag personal-tag personal-tag5">Personal tag</span>
<div id="about-inner-grid-wrap">
<div class="about-inner-grid-tag-container about-personal-container">
</div>
</section>
正如您在容器悬停时所看到的那样,我只能获取以像素为单位的位置的日志。我怎么能简单地将 50% 添加到每个“个人标签”的顶部位置?
解决方案
采用calc
const aboutTags = Array.from(document.querySelectorAll(".about-tag"));
document.querySelector(".about-personal-container").addEventListener("mouseover", function() {
const filteredTags = aboutTags.filter(tag => tag.classList.contains("personal-tag"))
const getTagPosition = filteredTags.map(tags => tags.style.top = tagPosition = 'calc('+window.getComputedStyle(tags).getPropertyValue('top')+' + 50%)');
console.log(getTagPosition)
//This gives the element top position but in pixels
});
#about-section {
background: black;
height: 100vh;
position: relative;
color: white;
}
.personal-tag {
position: absolute;
top: 0;
left: 0;
margin-bottom: 10px;
transition: all 1s;
}
.personal-tag1 {
top: 5%;
left: 15%;
}
.personal-tag2 {
top: 15%;
left: 35%
}
.personal-tag3 {
top: 25%;
left: 65%
}
#about-inner-grid-wrap {
border: 1px solid blue;
width: 300px;
height: 50%;
position: absolute;
left: 40%;
top: 50%;
display: flex;
}
.about-inner-grid-tag-container {
height: 100%;
border: 1px solid white;
flex: 1;
}
<section id="about-section">
<span class="about-tag personal-tag personal-tag1">Personal tag</span>
<span class="about-tag personal-tag personal-tag2">Personal second</span>
<span class="about-tag personal-tag personal-tag3">Personal third</span>
<span class="about-tag personal-tag personal-tag4">Personal tag</span>
<span class="about-tag personal-tag personal-tag5">Personal tag</span>
<div id="about-inner-grid-wrap">
<div class="about-inner-grid-tag-container about-personal-container">
</div>
</section>
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