css how to realize fixed element relative to parent element position

css how to realize fixed element relative to parent element position

css fixed 相对父元素定位

absolute bug ❌ / fixed bug ❌

absolute 滚动 bug / fixed 滚动 bug

添加 transform: translate(0, 0); 使 fixed 相对父元素定位

.assemble-creative-toggle-card-box {
    box-sizing: border-box;
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-flow: row wrap;
    // width: calc(325px + 16px);
    width: 325px;
    height: 185px;
    overflow-y: scroll;
    // overflow-y: auto;
    background: #F7F7F7;
    border: 1px solid #EEEEEE;
    padding: 10px;
    // fixed 参考
    // transform: translateY(0);
    // z-index: 1;
    // transform: translate(0, 0);
    /* hidden scrollbar */
    &::-webkit-scrollbar {
        display: none;
        width: 0 !important;
        height: 0 !important;
        background: transparent;
    }
    .creative-toggle-card-header {
        // margin-top: 10px;
        // position: fixed;
        // position: absolute;
        position: sticky;
        height: 0;
        transform: translate(-10px, -10px);
        top: 0;
        right: 0;
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        width: 100%;
        z-index: 2;
    }
}

sticky bug ❌

sticky 不滚动时候，占用高度空间 bug ❌

solution ✅ 🚀

.awesome-fixed-solution {
        position: sticky;
        height: 0;
        // ✅ height 设置为 0， 防止 sticky 没有滚动的时候占用空间，保持与滚动的时候一致性！
        transform: translate(-10px, -10px);
        // ✅调整偏移量，等价于本来 absolute 的 top, right 的负值
}

<style lang="scss">
.assemble-creative-toggle-card-box {
    box-sizing: border-box;
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-flow: row wrap;
    // width: calc(325px + 16px);
    width: 325px;
    height: 185px;
    overflow-y: scroll;
    // overflow-y: auto;
    background: #F7F7F7;
    border: 1px solid #EEEEEE;
    padding: 10px;
    // fixed 参考
    // transform: translateY(0);
    // z-index: 1;
    // transform: translate(0, 0);
    /* hidden scrollbar */
    &::-webkit-scrollbar {
        display: none;
        width: 0 !important;
        height: 0 !important;
        background: transparent;
    }
    .creative-toggle-card-header {
        // margin-top: 10px;
        // position: fixed;
        // position: absolute;
        position: sticky;
        height: 0;
        transform: translate(-10px, -10px);
        top: 0;
        right: 0;
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        width: 100%;
        z-index: 2;
        .toggle-switch {
            margin-top: 2px;
            margin-left: 4px;
            width: 14px;
            height: 14px;
            border-radius: 2px;
        }
        .tags-box {
            display: flex;
            align-items: flex-start;
            justify-content: flex-end;
            margin-top: 4px;
            margin-right: 4px;
            .recommended-box {
                height: 20px;
                line-height: 20px;
                // font-size: 12px;
                color: #FFFFFF;
                margin-right: 4px;
                .recommended-tag {
                    padding: 2px 6px;
                    display: inline-block;
                    height: 17px;
                    line-height: 17px;
                    background: #E6A23C;
                    border-radius: 2px;
                    text-align: center;
                    font-size: 12px;
                }
                .unrecommended-tag {
                    padding: 2px 6px;
                    display: inline-block;
                    height: 17px;
                    line-height: 17px;
                    background: #999999;
                    border-radius: 2px;
                    text-align: center;
                    font-size: 12px;
                }
            }
            .score-box {
                margin-right: -20px;
                // ✅ 右侧 item 对齐偏移量
                // box-sizing: border-box;
                display: flex;
                align-items: center;
                justify-content: center;
                height: 20px;
                line-height: 20px;
                background: #FCF5EB;
                border-radius: 2px;
                border: 1px solid #F7E3C4;
                .score-text {
                    display: inline-block;
                    height: 17px;
                    line-height: 17px;
                    font-size: 12px;
                    color: #E6A23C;
                    // width: 24px;
                    text-align: center;
                    padding: 2px 4px;
                    font-size: 12px;
                }
                .separate-line {
                    box-sizing: border-box;
                    display: inline-block;
                    width: 1px;
                    height: 10px;
                    background: #F7E3C4;
                    border-radius: 1px;
                    padding: 0;
                    margin: 0;
                }
            }
        }
    }
    .creative-toggle-card-body {
        box-sizing: border-box;
        // width: 150px;
        width: 147px;
        height: 80px;
        background: rgba(0, 0, 0, 0.5);
        border-radius: 4px;
        // height: 100%;
        max-height: 80px;
        overflow-y: hidden;
        margin-bottom: 5px;
        &:nth-of-type(2n) {
            margin-right: 5px;
        }
        &:nth-last-of-type(1) {
            margin-bottom: 0;
        }
        &:nth-last-of-type(2) {
            margin-bottom: 0;
        }
        .img-cover-url {
            box-sizing: border-box;
            width: 100%;
            // height: auto;
            height: 100%;
        }
        .assemble-video {
            position: relative;
            .tt-video-player {
                position: absolute;
                left: 50%;
                top: 50%;
                box-sizing: border-box;
                width: 32px;
                height: 32px;
                transform: translateX(-50%) translateY(-50%);
            }
        }
    }
    .creative-toggle-card-fotter {
        //
    }
}
</style>

MDN position

refs

https://developer.mozilla.org/en-US/docs/Web/CSS/position

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