Change ColModel, ColData And ColNames Dynamical
Introduction
jqGrid is a popular JavaScript library used for creating interactive tables in web applications. One of its key features is the ability to customize the column configuration, including the colModel, colData, and colNames properties. However, sometimes you may need to change these configurations dynamically based on user interactions or other events. In this article, we will explore how to dynamically change the colModel, colData, and colNames properties in jqGrid.
Understanding colModel, colData, and colNames
Before we dive into the dynamic configuration, let's briefly understand what each of these properties represents:
- colModel: This property defines the structure of each column in the grid. It is an array of objects, where each object represents a column and contains properties such as
name,index,width, andsorttype. - colData: This property is used to store the data for each column. It is an array of objects, where each object represents a column and contains the data for that column.
- colNames: This property defines the names of each column in the grid. It is an array of strings, where each string represents the name of a column.
Dynamic Configuration: Changing colModel, colData, and colNames
To change the colModel, colData, and colNames properties dynamically, you can use the following approaches:
1. Using the setColModel Method
The setColModel method allows you to update the colModel property of the grid. You can use this method to change the structure of the columns, including the name, index, width, and sorttype properties.
// Get the grid instance
var grid = $("#grid").jqGrid('getGridParam', 'grid');
// Define the new colModel
var newColModel = [
name,
name
];
// Set the new colModel
grid.setColModel(newColModel);
2. Using the setColData Method
The setColData method allows you to update the colData property of the grid. You can use this method to change the data for each column.
// Get the grid instance
var grid = $("#grid").jqGrid('getGridParam', 'grid');
// Define the new colData
var newColData = [
id,
id
];
// Set the new colData
grid.setColData(newColData);
3. Using the setColNames Method
The setColNames method allows you to update the colNames property of the grid. You can use this method to change the names of the columns.
// Get the grid instance
var grid = $("#grid").jqGrid('getGridParam', 'grid');
// Define the new colNames
var newColNames = ['New Column 1', 'New Column 2'];
// Set the new colNames
grid.setColNames(newColNames);
4. Using the reloadGrid Method
The reloadGrid method allows you to reload the grid with the new configuration. You can use this method to update the grid with the new colModel, colData, and colNames properties.
// Get the grid instance
var grid = $("#grid").jqGrid('getGridParam', 'grid');
// Define the new colModel, colData, and colNames
var newColModel = [
name,
name
];
var newColData = [
id,
id
];
var newColNames = ['New Column 1', 'New Column 2'];
// Reload the grid with the new configuration
grid.reloadGrid(
colModel);
Example Use Case: Changing Column Configuration on Button Click
Suppose you have a button that allows the user to switch between two different column configurations. You can use the setColModel, setColData, and setColNames methods to change the column configuration dynamically when the button is clicked.
// Get the grid instance
var grid = $("#grid").jqGrid('getGridParam', 'grid');
// Define the two column configurations
var config1 = [
name,
name
];
var config2 = [
name,
name
];
var data1 = [
id,
id
];
var data2 = [
id,
id
];
var names1 = ['Column 1', 'Column 2'];
var names2 = ['Column 3', 'Column 4'];
// Define the button click event handler
$("#button").on('click', function() {
// Change the column configuration
grid.setColModel(config1);
grid.setColData(data1);
grid.setColNames(names1});
// Define the button click event handler for the second configuration
$("#button2").on('click', function() {
// Change the column configuration
grid.setColModel(config2);
grid.setColData(data2);
grid.setColNames(names2);
});
Conclusion
Q: What is the difference between colModel and colData in jqGrid?
A: colModel defines the structure of each column in the grid, including the name, index, width, and sorttype properties. colData, on the other hand, stores the data for each column. Think of colModel as the blueprint for the columns, and colData as the actual data that is displayed in the columns.
Q: Can I change the colModel and colData properties at runtime?
A: Yes, you can change the colModel and colData properties at runtime using the setColModel and setColData methods, respectively. These methods allow you to update the column structure and data dynamically, without having to reload the entire grid.
Q: How do I reload the grid with the new column configuration?
A: You can use the reloadGrid method to reload the grid with the new column configuration. This method takes an object as an argument, which contains the new colModel, colData, and colNames properties.
Q: Can I use the reloadGrid method to update the grid with new data?
A: Yes, you can use the reloadGrid method to update the grid with new data. Simply pass the new data as an argument to the reloadGrid method, and the grid will be updated with the new data.
Q: How do I handle errors when updating the column configuration?
A: You can use the error event handler to handle errors when updating the column configuration. This event handler is triggered when an error occurs while updating the column configuration.
Q: Can I use the setColModel and setColData methods to update multiple columns at once?
A: Yes, you can use the setColModel and setColData methods to update multiple columns at once. Simply pass an array of column objects to the setColModel method, and an array of data objects to the setColData method.
Q: How do I know which columns have been updated?
A: You can use the afterSetColModel and afterSetColData event handlers to determine which columns have been updated. These event handlers are triggered after the column configuration has been updated.
Q: Can I use the reloadGrid method to update the grid with new column names?
A: Yes, you can use the reloadGrid method to update the grid with new column names. Simply pass the new column names as an argument to the reloadGrid method, and the grid will be updated with the new column names.
Q: How do I handle conflicts between the new and old column configurations?
A: You can use the beforeSetColModel and beforeSetColData event handlers to handle conflicts between the new and old column configurations. These event handlers are triggered before the column configuration is updated, and allow to cancel the update if necessary.
Q: Can I use the setColModel and setColData methods to update the grid with new data and column names?
A: Yes, you can use the setColModel and setColData methods to update the grid with new data and column names. Simply pass the new data and column names as arguments to the setColModel and setColData methods, and the grid will be updated with the new data and column names.
Conclusion
In this article, we have answered some of the most frequently asked questions about dynamic column configuration in jqGrid. We have covered topics such as updating the column configuration at runtime, reloading the grid with new data and column names, and handling errors and conflicts between the new and old column configurations. By following the techniques and examples presented in this article, you can create dynamic and interactive tables in your web applications using jqGrid.