Custom header component not rendering

Oct 13, 2025 by pynkocean.com 145 views

Introduction

Ag-Grid is a popular JavaScript library for building data grids. It provides a robust set of features, including filtering, sorting, and grouping. However, one of the limitations of Ag-Grid is its inability to display multi-line headers by default. In this article, we will explore how to implement a multi-line header in Ag-Grid while retaining its default filters and sorting functionality in a Vue.js application.

Problem Statement

When working with large datasets, it's common to have column headers that span multiple lines. However, Ag-Grid does not support multi-line headers by default. This can make it difficult to display complex column headers, which can lead to a cluttered and confusing user interface.

Solution

To implement a multi-line header in Ag-Grid, we need to use a custom header component. We will create a custom header component that will render the multi-line header and also retain the default filters and sorting functionality of Ag-Grid.

Step 1: Create a Custom Header Component

First, let's create a custom header component that will render the multi-line header. We will use the AgGridVue component to render the grid, and the AgGridColumn component to define the columns.

<template>
  <div style="height: 100vh;">
    <ag-grid-vue
      style="width: 100%; height: 100%;"
      class="ag-theme-alpine"
      :columnDefs="columnDefs"
      :rowData="rowData"
      @grid-ready="onGridReady"
    >
    </ag-grid-vue>
  </div>
</template>
<script>
import { AgGridVue } from 'ag-grid-vue';
import 'ag-grid-community/styles/ag-grid.css';
import 'ag-grid-community/styles/ag-theme-alpine.css';
export default 
components { AgGridVue ,
data() 
return {
columnDefs [
{
field: 'name',
headerComponent: 'multiLineHeader',
headerComponentParams: {
value: 'Name\nAddress\nPhone',
,
},

field 'age',
headerComponent: 'multiLineHeader',
headerComponentParams: {
value: 'Age\nAddress\nPhone',
,
},
],
rowData: [
 name 'John Doe', age: 30 ,
 name 'Jane Doe', age: 25 ,
],
};
},
methods: {
onGridReady(params) {
this.gridApi = params.api;
this.columnApi = params.columnApi;
},
},
};
</script>

In the above code, we have created a custom header component called multiLineHeader. We have defined two columns, name and age, and assigned the multiLineHeader component to each column.

Step 2: Create the Custom Header Component

Now, let's create the custom header component that will render the multi-line header.

<template>
  <div>
    <span>{{ value }}</span>
  </div>
</template>
<script>
export default 
props {
value: {
type: String,
required: true,
,
},
};
</script>

In the above code, we have created a custom header component that takes a value prop. We have used the value prop to render the multi-line header.

Step 3: Implement the Multi-Line Header

Now, let's implement the multi-line header. We will use the headerComponent property of the column definition to assign the custom header component to each column.

columnDefs: [
  {
    field: 'name',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Name\nAddress\nPhone',
    },
  },
  {
    field: 'age',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Age\nAddress\nPhone',
    },
  },
],

In the above code, we have assigned the multiLineHeader component to each column using the headerComponent property.

Conclusion

In this article, we have explored how to implement a multi-line header in Ag-Grid while retaining its default filters and sorting functionality in a Vue.js application. We have created a custom header component that renders the multi-line header and assigned it to each column using the headerComponent property. We have also implemented the multi-line header using the headerComponentParams property.

Example Use Cases

Here are some example use cases for the multi-line header:

Complex column headers: The multi-line header can be used to display complex column headers that span multiple lines.
Large datasets: The multi-line header can be used to display large datasets with complex column headers.
Customizable headers: The multi-line header can be customized to display different types of headers, such as headers with images or headers with different font sizes.

Code Snippets

Here are some code snippets that demonstrate the implementation of the multi-line header:

Custom header component:

* **Column definition**: ```javascript

columnDefs: [ field 'name', headerComponent: 'multiLineHeader', headerComponentParams: { value: 'Name\nAddress\nPhone', , }, field 'age', headerComponent: 'multiLineHeader', headerComponentParams: { value: 'Age\nAddress\nPhone', , }, ],

API Documentation

Here is the API documentation for the multi-line header:

headerComponent property: The headerComponent property is used to assign a custom header component to each column.
headerComponentParams property: The headerComponentParams property is used to pass parameters to the custom header component.
value prop: The value prop is used to render the multi-line header.

Troubleshooting

Here are some troubleshooting tips for the multi-line header:

Custom header component not rendering: Make sure that the custom header component is properly registered and that the headerComponent property is correctly assigned to each column.
Multi-line header not displaying: Make sure that the headerComponentParams property is correctly passed to the custom header component and that the value prop is correctly rendered.

Conclusion

Introduction

In our previous article, we explored how to implement a multi-line header in Ag-Grid while retaining its default filters and sorting functionality in a Vue.js application. In this article, we will answer some frequently asked questions (FAQs) about implementing a multi-line header in Ag-Grid.

Q: What is a multi-line header in Ag-Grid?

A: A multi-line header in Ag-Grid is a custom header component that can display multiple lines of text. It is useful for displaying complex column headers that span multiple lines.

Q: How do I implement a multi-line header in Ag-Grid?

A: To implement a multi-line header in Ag-Grid, you need to create a custom header component and assign it to each column using the headerComponent property. You can also pass parameters to the custom header component using the headerComponentParams property.

Q: What is the `headerComponent` property in Ag-Grid?

A: The headerComponent property in Ag-Grid is used to assign a custom header component to each column. It allows you to render a custom header component instead of the default header component.

Q: What is the `headerComponentParams` property in Ag-Grid?

A: The headerComponentParams property in Ag-Grid is used to pass parameters to the custom header component. It allows you to customize the behavior of the custom header component.

Q: How do I pass parameters to the custom header component?

A: To pass parameters to the custom header component, you need to use the headerComponentParams property and pass the parameters as an object. For example:

columnDefs: [
  {
    field: 'name',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Name\nAddress\nPhone',
    },
  },
  {
    field: 'age',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Age\nAddress\nPhone',
    },
  },
],

Q: How do I customize the behavior of the custom header component?

A: To customize the behavior of the custom header component, you need to use the headerComponentParams property and pass the parameters as an object. For example:

columnDefs: [
  {
    field: 'name',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Name\nAddress\nPhone',
      fontSize: 18,
      fontWeight: 'bold',
    },
  },
  {
    field: 'age',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      value: 'Age\nAddress\nPhone',
      fontSize: 14,
      fontWeight: 'normal',
    },
  },
],

Q: Can I use a template to render the custom header component?

A: Yes, you can use a template to render the custom header component. You can use the template property to specify a template for the custom header component.

columnDefs: [
  {
    field: 'name',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      template: '<div><span>{{ value }}</span></div>',
    },
  },
  {
    field: 'age',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      template: '<div><span>{{ value }}</span></div>',
    },
  },
],

Q: Can I use a function to render the custom header component?

A: Yes, you can use a function to render the custom header component. You can use the render property to specify a function for the custom header component.

columnDefs: [
  {
    field: 'name',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      render: (params) => {
        return `<div><span>${params.value}</span></div>`;
      },
    },
  },
  {
    field: 'age',
    headerComponent: 'multiLineHeader',
    headerComponentParams: {
      render: (params) => {
        return `<div><span>${params.value}</span></div>`;
      },
    },
  },
],

Conclusion

In this article, we have answered some frequently asked questions (FAQs) about implementing a multi-line header in Ag-Grid. We have covered topics such as implementing a multi-line header, passing parameters to the custom header component, customizing the behavior of the custom header component, using a template to render the custom header component, and using a function to render the custom header component.