javascript - 对齐 self :flex start is not sending child element to the top

Question

我正在用 javascript 创建一个元素并将其附加到一个 flex 容器中。我将其附加到的容器中有一个按钮和一个不显示的 div。我希望我正在制作的元素位于我将其附加到的 div 的顶部，并且我使用 align-self: flex-start 设置了它的类的样式，但由于某种原因，这什么也没做。 Align-self: flex-end 对任何其他 align-self 都不起作用。这是我的代码-

// //handler to show text from eventData array
document.addEventListener('click', (e)=> {
    let noEvents = document.getElementsByClassName('no-Events')[0];
    let eventsDescContainer = document.querySelector('.events');

    if(e.target.classList.contains('day')){
        [...eventData['events']].forEach((event)=>{
            if(event['day']===e.target.innerHTML && event['month']===headerMonths.innerHTML && event['year']===headerYears.innerHTML){
                //span element to put Event text into
                let eventDesc = `${event['description']}`
                const span = document.createElement('span');
                let EventText = document.createTextNode(eventDesc);;
                //clear previous events message
                noEvents.style.display='none';
                clearEventText();

                //append to container
                span.appendChild(EventText)
                span.classList.add('event-desc', 'event-message');
                eventsDescContainer.appendChild(span);
            }  else {
                clearEventText();
                noEvents.style.display='initial';
                noEvents.innerHTML = `There are no events on ${headerMonths.innerHTML} ${e.target.innerHTML} ${headerYears.innerHTML}`;
            }
        });
    }
});




 <div class='events'>
                     //this span is hidden
                    <span class='no-Events event-message'>There are no events today</span>     //this button has no styles on it, it is just plain html 
                    <button class='show-event-form rotate'>Add new event</button>
                    //This is the span I want to go at the top of the container but it is positioned after the button
                    <span class='event-desc event-message'>text</span>
                </div>

这是容器的 html 和我创建的跨度。该按钮没有样式。

.events{
    height: 100%;
    display:flex;
    flex-direction: column;
    align-items: center; /*center children vertically*/
    overflow-y: auto;
}

.events .event-message {
    align-items: center;
    width: 80%;
    text-align: center;
    margin: 20px auto;
    padding: 10px 0;
    background-image: linear-gradient(to right, #649173, #dbd5a4 );
    border-radius: 3px;
    box-shadow: 3px 6px 10px #393a39;
}
//this is not working
.event-desc {
    align-self: flex-start;
}

Answer 1

我将容器中的 flex-direction 方向更改为 flex-direction:column-reverse 和 justify-content:start 以将其发送到容器顶部，这解决了我的问题。我仍然不确定为什么 align-self 会起作用。