Angular TreeList - Column Fixing

In some cases, the UI component contains so many columns that they cause horizontal scrolling. If specific columns should be on screen constantly regardless of how far the UI component is scrolled, a user can fix them.

DevExtreme HTML5 JavaScript jQuery Angular Knockout UI component TreeList ColumnFixing

To allow this, set the columnFixing.enabled property to true. If a user should never fix (or unfix) a specific column, set its allowFixing property to false.

jQuery
JavaScript
$(function() {
    $("#treeListContainer").dxTreeList({
        columnFixing: {
            enabled: true
        },
        columns: [{
            // ...
            allowFixing: false
        }]
    });
});
Angular
HTML
TypeScript
<dx-tree-list ... >
    <dxo-column-fixing [enabled]="true"></dxo-column-fixing>
    <dxi-column [allowFixing]="true" ... ></dxi-column>
</dx-tree-list>
import { DxTreeListModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTreeListModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTreeList ... >
        <DxColumnFixing :enabled="true" />
        <DxColumn :allow-fixing="false" ... />
    </DxTreeList>
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxTreeList, {
    DxColumn,
    DxColumnFixing
} from 'devextreme-vue/tree-list';

export default {
    components: {
        DxTreeList,
        DxColumn,
        DxColumnFixing
    },
    // ...
}
</script>
React
App.js
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import TreeList, {
    Column,
    ColumnFixing
} from 'devextreme-react/tree-list';

export default function App() {
    return (
        <TreeList ... >
            <ColumnFixing enabled={true} />
            <Column allowFixing={false} ... />
        </TreeList>
    );
}

If a column should be fixed initially, assign true to its fixed property and specify its target position in the UI component using the fixedPosition property.

jQuery
JavaScript
$(function() {
    $("#treeListContainer").dxTreeList({
        columns: [{
            // ...
            fixed: true,
            fixedPosition: "left"
        }]
    });
});
Angular
HTML
TypeScript
<dx-tree-list ... >
    <dxi-column [fixed]="true" fixedPosition="left" ... ></dxi-column>
</dx-tree-list>
import { DxTreeListModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTreeListModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTreeList ... >
        <DxColumn :fixed="true" fixed-position="left" ... />
    </DxTreeList>
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxTreeList, {
    DxColumn
} from 'devextreme-vue/tree-list';

export default {
    components: {
        DxTreeList,
        DxColumn,
        DxColumnFixing
    },
    // ...
}
</script>
React
App.js
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import TreeList, {
    Column
} from 'devextreme-react/tree-list';

export default function App() {
    return (
        <TreeList ... >
            <Column fixed={true} fixedPosition="left" ... />
        </TreeList>
    );
}
NOTE
Once you assign true to the columnFixing.enabled or fixed property, command columns become fixed automatically.

Since column fixing is effective only with horizontal scrolling, using it makes sense only if the columnAutoWidth property is false and when the total width of columns exceeds the container width. Otherwise, fixed columns behave just like regular ones.

View Demo

See Also