How to validate a textbox in JQGrid?

 To validate a textbox in JQGrid, you can use the editrules property of the column model. Here is an example code snippet that demonstrates how to validate a textbox in JQGrid:

// Assuming the grid's ID is "myGrid" and the column's name is "myColumn"
$("#myGrid").jqGrid({
    // Other grid configuration options...
    colModel: [
        // Other column definitions...
        {
            name: "myColumn",
            index: "myColumn",
            width: 150,
            align: "left",
            sortable: true,
            editable: true,
            editrules: {required: true, minlength: 5, maxlength: 10}
        }
    ]
});

In this example, we define a column with the name "myColumn" and set the editrules property to an object with three properties: required, minlength, and maxlength. These properties represent the validation rules for the textbox. The required property specifies that the textbox must contain a value, and the minlength and maxlength properties specify the minimum and maximum length of the textbox value, respectively.

When the user edits the row containing the "myColumn" column, JQGrid will validate the textbox value against the specified validation rules. If the value is invalid, JQGrid will display an error message and prevent the user from saving the row until the value is corrected.

Note that JQGrid provides a number of built-in validation rules that can be used with the editrules property, such as email, url, number, and integer. You can also define custom validation rules by specifying a JavaScript function as the value of the custom property. For more information, see the JQGrid documentation on validation rules.