CSSGrid

Description

The CSS Grid Layout Module offers a grid-based layout system, with rows and columns, making it easier to design web pages without having to use floats and positioning.

While regular controls (such as Buttons and Labels) can be added directly to a CSSGrid, there is a special control called CSSGridItem which is used to define sections within the Grid. CSSGridItems can be combined to make irregular sections in the CSSGrid. In the above example, the top row of the CSSGrid has been merged into a single control called Header.

The CSSGrid control can be used as a wrapper for other controls you have set up in your project. Add them to the Design Screen as usual, then right click in a CSSGrid and use Add Child. The control will then move into the CSSGrid. If you reposition the CSSGrid, the included controls ("children") will move with it. Use right click Remove Child to take a child out of a CSSGrid.

CSSGrids can contain other CSSGrids.

To add a CSSGrid control to your app, choose the CSSGrid icon in the Toolbar, then position it on the Design Screen. Use the Property Editor to set the properties you need. Right click in the CSSGrid to add children.

At runtime, controls can be added as children to the CSSGrid or CSSGridItems using the addChild() function: CSSGrid.addChild(Button1).

Here are some useful resources for learning more about using CSDGrid:

• https://www.w3schools.com/css/css_grid.asp
• https://css-tricks.com/snippets/css/complete-guide-grid/
• https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout

alignContent and justifyContent

The alignContent and justifyContent properties define how the CSSGrid will look. Both have the same possible values.

To see their effect, run the CSSGrid sample which comes with AppStudio. It has Select boxes which let you play with both settings so you can see the effect.

start	The items are packed flush to each other toward the start edge of the alignment container in the cross axis
end	The items are packed flush to each other toward the end edge of the alignment container in the cross axis
center	The items are packed flush to each other toward the center of the alignment container along the cross axis.
stretch	The items are shown so that the combined size exactly fills the alignment container along the cross axis.
space-around	The empty space before the first and after the last item equals half of the space between each pair of adjacent items.
space-between	The first item is flush with the main-start edge, and the last item is flush with the main-end edge.
space-evenly	The spacing between each pair of adjacent items, the main-start edge and the first item, and the main-end edge and the last item, are all exactly the same.

flexDirection

Sets the direction of the flexible items inside the control. display:flex must be set.

flexWrap

Specifies whether the flexible items should wrap or not. display:flex must be set.

justifyContent

Aligns the flexible container's items when the items do not use all available space on the main-axis (horizontally). display:flex must be set.

Properties

FlexBox Properties

alignContent	Modifies the behavior of the flex-wrap property. It is similar to align-items, but instead of aligning flex items, it aligns flex lines. display:flex must be set. stretch: Default value. Lines stretch to take up the remaining space: center: Lines are packed toward the center of the flex container flex-start: Lines are packed toward the start of the flex container flex-end: Lines are packed toward the end of the flex container space-between: Lines are evenly distributed in the flex container: space-around: Lines are evenly distributed in the flex container, with half-size spaces on either end: initial: Sets this property to its default value. inherit: Inherits this property from its parent element.,
alignItems	Specifies the default alignment for items inside the flexible container. display:flex must be set. stretch: Default. Items are stretched to fit the container: center: Items are positioned at the center of the container: flex-start: Items are positioned at the beginning of the container flex-end: Items are positioned at the end of the container: baseline: Items are positioned at the baseline of the container: initial: Sets this property to its default value. inherit: Inherits this property from its parent element.,
flexDirection	Sets the direction of the flexible items inside the control. display:flex must be set. row: Default value. The flexible items are displayed horizontally, as a row: row-reverse: Same as row, but in reverse order: column: The flexible items are displayed vertically, as a column. column-reverse: Same as column, but in reverse order: initial: Sets this property to its default value. inherit: Inherits this property from its parent element.,
flexWrap	Specifies whether the flexible items should wrap or not. display:flex must be set. nowrap: Default value. Specifies that the flexible items will not wrap: wrap: Specifies that the flexible items will wrap if necessary: wrap-reverse: Specifies that the flexible items will wrap, if necessary, in reverse order: initial: Sets this property to its default value. inherit: Inherits this property from its parent element. ,
justifyContent	Aligns the flexible container's items when the items do not use all available space on the main-axis (horizontally). display:flex must be set. flex-start: Default value. Items are positioned at the beginning of the container: flex-end: Items are positioned at the end of the container: center: Items are positioned at the center of the container: space-between: Items are positioned with space between the lines space-around: Items are positioned with space before, between, and after the lines initial: Sets this property to its default value. inherit: Inherits this property from its parent element.

Other Properties

Standard properties are supported, plus:

addChild(control)	control is added to the Control. Runtime.
attributes	A list of HTML attributes. To prevent jQuery Mobile from styling the element, use data-role=none. Attributes are separated by spaces. Design time.
center	Centers the contents, horizontally and vertically. Only works if HTMLTag is 'div'.
class	List of CSS classes to apply to the element. Class names are separated by spaces. Design time.
content	The text to use in between the HTML tags. Can be text or HTML. Design time. At runtime, use .innerHTML.
HTMLTag	The HTML tag of the control. Common values are div, button, text, ol, etc. For example. if value is 'button', then this HTML will be created: <button>content</button>. Design time.
innerHTML	The text to use in between the HTML tags. Can be text or HTML. Run time. At Design Time,, use content.
position	How children positioned. Default is 'relative': elements are positioned relative to each other and the size of the FlexBox. With 'absolute', controls are positioned within the FlexBox set by width and height. Other options are 'fixed' and 'static'. Design time.
style	A list of style properties, each in the form styleName:value; Example: "height:40px; width:100px".Design time.

Events

Standard events are supported.

Examples

Change the color of the text

FlexBox1.style.color = "red"