.. only:: html .. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_widgets_textbox.py: ======= Textbox ======= The Textbox widget lets users interactively provide text input, including formulas. In this example, the plot is updated using the `.on_submit` method. This method triggers the execution of the *submit* function when the user presses enter in the textbox or leaves the textbox. Note: The `matplotlib.widgets.TextBox` widget is different from the following static elements: :doc:`/tutorials/text/annotations` and :doc:`/gallery/recipes/placing_text_boxes`. .. code-block:: default import numpy as np import matplotlib.pyplot as plt from matplotlib.widgets import TextBox fig, ax = plt.subplots() fig.subplots_adjust(bottom=0.2) t = np.arange(-2.0, 2.0, 0.001) l, = ax.plot(t, np.zeros_like(t), lw=2) def submit(expression): """ Update the plotted function to the new math *expression*. *expression* is a string using "t" as its independent variable, e.g. "t ** 3". """ ydata = eval(expression) l.set_ydata(ydata) ax.relim() ax.autoscale_view() plt.draw() axbox = fig.add_axes([0.1, 0.05, 0.8, 0.075]) text_box = TextBox(axbox, "Evaluate") text_box.on_submit(submit) text_box.set_val("t ** 2") # Trigger `submit` with the initial string. plt.show() .. image:: /gallery/widgets/images/sphx_glr_textbox_001.png :alt: textbox :class: sphx-glr-single-img ------------ References """""""""" The use of the following functions, methods, classes and modules is shown in this example: .. code-block:: default from matplotlib.widgets import TextBox .. _sphx_glr_download_gallery_widgets_textbox.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: textbox.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: textbox.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_