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chore(*): Add notes on new state persistance changes. #5979

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chore(*): Add notes on new state persistance changes. #5979

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chore(*): Add notes on new state persistance changes.
MayaKirova Oct 23, 2024
a5c50b2
chore(*): Show mrl only for base grid.
MayaKirova Nov 29, 2024
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11 changes: 8 additions & 3 deletions en/components/grids_templates/state-persistence.md
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Expand Up @@ -51,7 +51,10 @@ _canonicalLink: grid/state-persistence
* `Expansion`
* `GroupBy`
* `Columns`
* **NEW**: Multi column headers are now supported out of the box
* Multi column headers
@@if (igxName === 'IgxGrid') {
* Multi-row Layout
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@dkamburov dkamburov Nov 29, 2024 •
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Actually we don't have MRL for the treegrid. Should be added only for the flat grid

}
* Columns order
* Column properties defined by the [`IColumnState`]({environment:angularApiUrl}/interfaces/icolumnstate.html) interface.
* Columns templates and functions are restored using application level code, see [Restoring Column](state-persistence.md#restoring-columns) section.
Expand All @@ -70,7 +73,7 @@ _canonicalLink: grid/state-persistence
* `Row Pinning`
* `Expansion`
* `Columns`
* **NEW**: Multi column headers are now supported out of the box
* Multi column headers
* Columns order
* Column properties defined by the [`IColumnState`]({environment:angularApiUrl}/interfaces/icolumnstate.html) interface.
* Columns templates and functions are restored using application level code, see [Restoring Column](state-persistence.md#restoring-columns) section.
Expand Down Expand Up @@ -173,7 +176,9 @@ public restoreGridState() {
@@if (igxName !== 'IgxPivotGrid') {
## Restoring columns

[`IgxGridState`]({environment:angularApiUrl}/classes/igxgridstatedirective.html) will not persist columns templates, column formatters, etc. by default (see [`limitations`](state-persistence.md#limitations)). Restoring any of these can be achieved with code on application level. Let's show how to do this for templated columns:
When possible the state directive will reuses the columns that already exists on the grid when restoring the state, instead of creating new column instances. The only scenario where a new instance will be created is when the column (or its children in case of a column groups) have no `field` property so there's no way to uniquely identify the matching column and re-use it.

For such scenarios, the following [`limitations`](state-persistence.md#limitations) are imposed. In that case restoring complex objects can be achieved with code on application level. Let's show how to do this for templated columns:

1. Define a template reference variable (in the example below it is `#activeTemplate`) and assign an event handler for the [`columnInit`]({environment:angularApiUrl}/classes/igxgridcomponent.html#columnInit) event:
@@if (igxName === 'IgxGrid') {
Expand Down