你可以将 clientWidth
、clientHeight
、offsetWidth
和 offsetHeight
绑定添加到任何元素,Svelte 将使用 ResizeObserver
更新绑定值:
¥You can add clientWidth
, clientHeight
, offsetWidth
and offsetHeight
bindings to any element, and Svelte will update the bound values using a ResizeObserver
:
<div bind:clientWidth={w} bind:clientHeight={h}>
<span style="font-size: {size}px" contenteditable>{text}</span>
<span class="size">{w} x {h}px</span>
</div>
这些绑定是只读的 - 更改 w
和 h
的值不会对元素产生任何影响。
¥These bindings are readonly — changing the values of w
and h
won’t have any effect on the element.
display: inline
元素没有宽度或高度(具有 ‘intrinsic’ 尺寸的元素除外,如<img>
和<canvas>
),并且无法通过ResizeObserver
观察到。你需要将这些元素的display
样式更改为其他样式,例如inline-block
。¥[!NOTE]
display: inline
elements do not have a width or height (except for elements with ‘intrinsic’ dimensions, like<img>
and<canvas>
), and cannot be observed with aResizeObserver
. You will need to change thedisplay
style of these elements to something else, such asinline-block
.
<script>
let w = $state();
let h = $state();
let size = $state(42);
</script>
<label>
<input type="range" bind:value={size} min="10" max="100" />
font size ({size}px)
</label>
<div>
<span style="font-size: {size}px" contenteditable>
edit this text
</span>
<span class="size">{w} x {h}px</span>
</div>
<style>
div {
position: relative;
display: inline-block;
padding: 0.5rem;
background: hsla(15, 100%, 50%, 0.1);
border: 1px solid hsl(15, 100%, 50%);
}
.size {
position: absolute;
right: -1px;
bottom: -1.4em;
line-height: 1;
background: hsl(15, 100%, 50%);
color: white;
padding: 0.2em 0.5em;
white-space: pre;
}
</style>