Example¶

set position and order of elements in a container¶

explain this css in dash

.my-tab-1 {
  top: 0;
  z-index: 102; }
.my-tab-2 {
  top: calc(160px - 22px);
  z-index: 101; }

• top: 0;: This property sets the top positioning of the element. In this case, it is set to 0, which means the element will be positioned at the top of its containing element. If the containing element is the entire page, the element with the class "compare-tab" will be at the top of the page.

• z-index: 102;: This property sets the z-index of the element. The z-index determines the stack order of an element concerning the z-axis (front-to-back order). Elements with a higher z-index will be displayed in front of elements with a lower z-index. In this case, the "compare-tab" element will be displayed in front of elements with a lower z-index, and potentially behind elements with a higher z-index.

These styles suggest that the element with the class "compare-tab" is meant to be positioned at the top of its container, and it has a z-index of 102, which might be relevant if there are other elements on the page with different z-index values. The exact appearance and behavior would also depend on the other styles applied to the element and its context in the HTML structure.

h-100 and v-100¶

In Dash CSS, h-100 and v-100 are CSS properties that can be used to set the height and width of an element to 100% of its parent container.

• h-100 sets the height of an element to 100% of its parent container. This means that the element will take up the entire height of its parent container.

• v-100 sets the width of an element to 100% of its parent container. This means that the element will take up the entire width of its parent container.

These properties are commonly used to create full-width and full-height elements, such as background images and navigation bars.

code 1¶

The html.Div component is being created with a list containing a metric_tab element as its child. The style attribute is used to apply specific styling to this html.Div component. Let's break down the style:

style={
    'flex': '1 1 75%',
    'display': 'flex',
    'flexDirection': 'column',
    'marginTop': '-18px',
    'padding': '1px',
}

1. 'flex': '1 1 75%': This is setting the flex property of the element. The flex property is shorthand for three individual properties: flex-grow, flex-shrink, and flex-basis. In this case, it is set to '1 1 75%', which means:

   • flex-grow: 1 (the element can grow to fill the available space)
   • flex-shrink: 1 (the element can shrink if there is not enough space)
   • flex-basis: 75% (initial size of the element before growing or shrinking)

2. 'display': 'flex': This specifies that the element should be treated as a flex container. Flex containers can be used to control the layout and alignment of their children.

3. 'flexDirection': 'column': This sets the direction of the flex container's main axis. In this case, it's set to 'column', which means the children of the flex container will be placed in a column (top to bottom) layout.

4. 'marginTop': '-18px': This sets the top margin of the element to -18 pixels. A negative margin can be used to adjust the spacing above the element.

5. 'padding': '1px': This property sets the padding of the element to 1 pixel on all sides. Padding is the space between the content of an element and its border.

So, in summary, this piece of code is styling a html.Div to be a flex container with a vertical column layout for its children (metric_tab). It has a flexible width of 75% of its parent container, can grow or shrink as needed, and has a negative top margin of 18 pixels.