My goal is to have a textarea adjust its height to match the height of the containing div.
Currently, the width is perfect, but the empty textbox only takes up around 20% of the div's height. Even when text is added via an ajax call, the textarea remains at that same height and displays a scroll bar.
How can I modify my CSS to ensure that the textarea always fills the entire height of its parent div?
To ensure the height: 100% of the textarea fills the parent container, you must first set a specific height for the parent container using pixels or rem units.
Expanding text content dynamically cannot be achieved with basic CSS alone. JavaScript is required to calculate the content's height and adjust the parent container accordingly.
For the height: 100% property to work on the parent container, its ancestor needs to have a predefined height (e.g., 100vh). This allows the browser to compute the height of each DOM element and resize the textarea accordingly.
UPDATE - I implemented a JS function to automatically increase the parent container's height when input is detected. The textarea expands in height as it occupies 100% of the parent container. Further adjustments may be needed, but typing in the textarea will trigger automatic expansion.
function setHeight(element) {
const container = document.getElementById("answerBoxDiv");
const height = element.scrollHeight;
if (height > 100) {
container.style.height = (element.scrollHeight)+"px";
}
}#answerBoxDiv {
width: 90%;
height: 100px; **// this is needed - but can be in px / rem / vh or other but NOT % unless its parent has its height set.**
margin: 5px auto;
border: 4px solid #00bfb6;
padding: 5px;
font-size: 10px;
text-align: left;
position: relative;
}
#answerBox {
width: 100%;
height: 100%;
box-sizing: border-box;
padding: 5px;
font-size: 10px;
text-align: left;
position: relative;
resize: vertical;
overflow: hidden
}<div id="answerBoxDiv">
<textarea id="answerBox" oninput="setHeight(this)"></textarea>
</div>If you're encountering issues with percentage height not working when the parent has a min-height, there are a couple of solutions to consider. One option is to give your parent element a specific height. Alternatively, you can utilize flexbox to achieve the desired layout:
html,
body {
height: 100%;
margin: 0;
}
#answerBox {
flex-grow:1;
width: 100%;
box-sizing: border-box;
margin: 5px auto;
padding: 5px;
font-size: 10px;
text-align: left;
position: relative;
}
#answerBoxDiv {
width: 90%;
min-height: 50%;
margin: 5px auto;
border: 4px solid #00bfb6;
padding: 5px;
font-size: 10px;
text-align: left;
position: relative;
display: flex;
flex-direction: column;
}<div id="answerBoxDiv">
<textarea id="answerBox"></textarea>
</div>Feel free to give this a shot
#resultBox {
width: 100%;
max-height: none;
}
Consider setting the minimum height of your textarea to 100% or a similar value, alternatively experiment with utilizing the object-fit: contain(or cover) property on your text area for optimal display.
Set a specific height for the parent div with the ID #answerBoxDiv to ensure it displays at the appropriate height.
<div class="parent-div" style="height: 100%;">
<div id="answerBoxDiv">
<textarea id="answerBox"></textarea>
</div>
</div>
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