| Function signature[source] | |
|---|---|
st.text_area(label, value="", height=None, max_chars=None, key=None, help=None, on_change=None, args=None, kwargs=None, *, placeholder=None, disabled=False, label_visibility="visible") | |
| Parameters | |
label (str) | A short label explaining to the user what this input is for. The label can optionally contain GitHub-flavored Markdown of the following types: Bold, Italics, Strikethroughs, Inline Code, and Links. Unsupported Markdown elements are unwrapped so only their children (text contents) render. Display unsupported elements as literal characters by backslash-escaping them. E.g., "1\. Not an ordered list". See the body parameter of st.markdown for additional, supported Markdown directives. For accessibility reasons, you should never set an empty label (label="") but hide it with label_visibility if needed. In the future, we may disallow empty labels by raising an exception. |
value (object or None) | The text value of this widget when it first renders. This will be cast to str internally. If None, will initialize empty and return None until the user provides input. Defaults to empty string. |
height (int or None) | Desired height of the UI element expressed in pixels. If None, a default height is used. |
max_chars (int or None) | Maximum number of characters allowed in text area. |
key (str or int) | An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. No two widgets may have the same key. |
help (str) | An optional tooltip that gets displayed next to the textarea. |
on_change (callable) | An optional callback invoked when this text_area's value changes. |
args (tuple) | An optional tuple of args to pass to the callback. |
kwargs (dict) | An optional dict of kwargs to pass to the callback. |
placeholder (str or None) | An optional string displayed when the text area is empty. If None, no text is displayed. |
disabled (bool) | An optional boolean, which disables the text area if set to True. The default is False. |
label_visibility ("visible", "hidden", or "collapsed") | The visibility of the label. If "hidden", the label doesn't show but there is still empty space for it above the widget (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible". |
| Returns | |
(str or None) | The current value of the text area widget or None if no value has been provided by the user. |
Example
import streamlit as st txt = st.text_area( "Text to analyze", "It was the best of times, it was the worst of times, it was the age of " "wisdom, it was the age of foolishness, it was the epoch of belief, it " "was the epoch of incredulity, it was the season of Light, it was the " "season of Darkness, it was the spring of hope, it was the winter of " "despair, (...)", ) st.write(f"You wrote {len(txt)} characters.")
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