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As a commit of its own so it doesn't obscure any real change.
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Dave Pearson
2022-10-09 20:32:23 +01:00
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10
docs/guide/queries.md
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@@ -4,7 +4,7 @@ In the previous chapter we introduced the [DOM](../guide/CSS.md#the-dom) which i
Selectors are a very useful idea and can do more that apply styles. We can also find widgets in Python code with selectors, and make updates to widgets in a simple expressive way. Let's look at how! Selectors are a very useful idea and can do more that apply styles. We can also find widgets in Python code with selectors, and make updates to widgets in a simple expressive way. Let's look at how!
## Query one ## Query one
The [query_one][textual.dom.DOMNode.query_one] method gets a single widget in an app or other widget. If you call it with a selector it will return the first matching widget. The [query_one][textual.dom.DOMNode.query_one] method gets a single widget in an app or other widget. If you call it with a selector it will return the first matching widget.
@@ -16,7 +16,7 @@ send_button = self.query_one("#send")
If there is no widget with an ID of `send`, Textual will raise a [NoMatches][textual.css.query.NoMatches] exception. Otherwise it will return the matched widget. If there is no widget with an ID of `send`, Textual will raise a [NoMatches][textual.css.query.NoMatches] exception. Otherwise it will return the matched widget.
You can also add a second parameter for the expected type. You can also add a second parameter for the expected type.
```python ```python
send_button = self.query_one("#send", Button) send_button = self.query_one("#send", Button)
@@ -58,7 +58,7 @@ for button in self.query("Button"):
print(button) print(button)
``` ```
Any selector that works in CSS will work with the `query` method. For instance, if we want to find all the disabled buttons in a Dialog widget, we could do this: Any selector that works in CSS will work with the `query` method. For instance, if we want to find all the disabled buttons in a Dialog widget, we could do this:
```python ```python
for button in self.query("Dialog Button.disabled"): for button in self.query("Dialog Button.disabled"):
@@ -122,9 +122,9 @@ Let's say we have a query which gets all the buttons in an app, and we want a ne
```python ```python
# Get all the Buttons # Get all the Buttons
buttons_query = self.query("Button") buttons_query = self.query("Button")
# Buttons with 'disabled' CSS class # Buttons with 'disabled' CSS class
disabled_buttons = buttons_query.filter(".disabled") disabled_buttons = buttons_query.filter(".disabled")
``` ```
Iterating over `disabled_buttons` will give us all the disabled buttons. Iterating over `disabled_buttons` will give us all the disabled buttons.