Paging in Vue Treegrid component
11 Jun 202415 minutes to read
Paging provides an option to display TreeGrid data in page segments. To enable paging, set the allowPaging
to true. When paging is enabled, pager component renders at the bottom of the treegrid. Paging options can be configured through the pageSettings
.
To use paging, inject the Page
module in the grid.
<template>
<div id="app">
<ejs-treegrid :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings'>
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script setup>
import { provide } from "vue";
import { TreeGridComponent as EjsTreegrid, Page, ColumnsDirective as EColumn, ColumnsDirective as EColumns } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
const data = sampleData;
const pageSettings = { pageSize: 7 };
provide('treegrid', [ Page ]);
</script>
<template>
<div id="app">
<ejs-treegrid :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings'>
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script>
import { TreeGridComponent, Page, ColumnDirective, ColumnsDirective } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
export default {
name: "App",
components: {
"ejs-treegrid":TreeGridComponent,
"e-columns":ColumnsDirective,
"e-column":ColumnDirective,
},
data () {
return {
data: sampleData,
pageSettings: { pageSize: 7 }
};
},
provide: {
treegrid: [ Page ]
}
}
</script>
You can achieve better performance by using treegrid paging to fetch only a pre-defined number of records from the data source.
Page Size Mode
Two behaviors are available in TreeGrid paging to display certain number of records in a current page. Following are the two types of pageSizeMode
.
-
All : This is the default mode. The number of records in a page is based on
pageSize
property. -
Root : The number of root nodes or the 0th level records to be displayed per page is based on
pageSize
property.
With pageSizeMode
property as Root
, only the root level or the 0th level records are considered in records count.
<template>
<div id="app">
<ejs-treegrid :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings' height='265px' >
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script setup>
import { provide } from "vue";
import { TreeGridComponent as EjsTreegrid, Page, ColumnDirective as EColumn, ColumnsDirective as EColumns } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
const data = sampleData;
const pageSettings = { pageSize: 2, pageSizeMode: 'Root'};
provide('treegrid', [ Page ]);
</script>
<template>
<div id="app">
<ejs-treegrid :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings' height='265px' >
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script>
import { TreeGridComponent, Page, ColumnDirective, ColumnsDirective } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
export default {
name: "App",
components: {
"ejs-treegrid":TreeGridComponent,
"e-columns":ColumnsDirective,
"e-column":ColumnDirective,
},
data () {
return {
data: sampleData,
pageSettings: { pageSize: 2, pageSizeMode: 'Root'}
};
},
provide: {
treegrid: [ Page ]
},
}
</script>
Pager with Page Size Dropdown
The pager Dropdown allows you to change the number of records in the TreeGrid dynamically. It can be enabled by defining the pageSettings.pageSizes
property as true.
pageSettings: {pageSize: 7, pageSizes: true},
How to render Pager at the Top of the TreeGrid
By default, Pager will be rendered at the bottom of the TreeGrid. You can also render the Pager at the top of the TreeGrid by using the dataBound
event.
<template>
<div id="app">
<ejs-treegrid ref='treegrid' :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings' :dataBound='ondataBound'>
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script setup>
import { provide, ref } from "vue";
import { TreeGridComponent as EjsTreegrid, Page, ColumnDirective as EColumn, ColumnsDirective as EColumns } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
const treegrid = ref(null);
const data = sampleData;
const pageSettings = { pageSize: 7, pageSizes: true };
const initialGridLoad = true;
const ondataBound = function() {
if (initialGridLoad) {
initialGridLoad = false;
let pager = document.getElementsByClassName('e-gridpager e-control e-pager e-lib');
let topElement;
if ( treegrid.value.toolbar) {
topElement = document.getElementsByClassName('e-toolbar');
} else {
topElement = document.getElementsByClassName('e-gridheader e-lib e-droppable');
}
topElement[0].before(pager[0]);
}
};
provide('treegrid', [ Page ]);
</script>
<template>
<div id="app">
<ejs-treegrid ref='treegrid' :dataSource='data' childMapping='subtasks' :treeColumnIndex='1' :allowPaging='true' :pageSettings='pageSettings' :dataBound='ondataBound'>
<e-columns>
<e-column field='taskID' headerText='Task ID' width='90' textAlign='Right'></e-column>
<e-column field='taskName' headerText='Task Name' width='160'></e-column>
<e-column field='startDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
<e-column field='duration' headerText='Duration' width='80' textAlign='Right'></e-column>
</e-columns>
</ejs-treegrid>
</div>
</template>
<script>
import { TreeGridComponent, ColumnDirective, Page, ColumnsDirective } from "@syncfusion/ej2-vue-treegrid";
import { sampleData } from "./datasource.js";
export default {
name: "App",
components: {
"ejs-treegrid":TreeGridComponent,
"e-columns":ColumnsDirective,
"e-column":ColumnDirective,
},
data () {
return {
data: sampleData,
pageSettings: { pageSize: 7, pageSizes: true },
initialGridLoad : true
};
},
provide: {
treegrid: [ Page ]
},
methods: {
ondataBound: function() {
if (this.initialGridLoad) {
this.initialGridLoad = false;
let pager = document.getElementsByClassName('e-gridpager e-control e-pager e-lib');
let topElement;
if ( this.$refs.treegrid.toolbar) {
topElement = document.getElementsByClassName('e-toolbar');
} else {
topElement = document.getElementsByClassName('e-gridheader e-lib e-droppable');
}
topElement[0].before(pager[0]);
}
}
}
}
</script>
During the paging action, the pager component triggers the below three events.
- The
created
event triggers when Pager is created.- The
click
event triggers when the numeric items in the pager is clicked.- The
dropDownChanged
event triggers when pageSize DropDownList value is selected.