How to change the background color of a cell in JQGrid?

 To change the background color of a cell in JQGrid based on a condition, you can use a custom formatter. Here are the steps:

1. Define a custom formatter function that takes three parameters: cellvalue, options, and rowObject.
2. Inside the formatter function, check the condition that you want to apply to the cell. If the condition is met, set the background color of the cell using jQuery.
3. Return the formatted value as a string.

Here is an example of a custom formatter function that changes the background color of a cell to red if the cell value is negative:

javascript
function customFormatter(cellvalue, options, rowObject) {
  if (cellvalue < 0) {
    return '<span style="background-color: red">' + cellvalue + '</span>';
  } else {
    return cellvalue;
  }
}

To use this custom formatter in your JQGrid, set the formatter property of the column definition to the name of the formatter function:

javascript
colModel: [
  { name: 'id', index: 'id', width: 50 },
  { name: 'name', index: 'name', width: 200 },
  { name: 'value', index: 'value', width: 100, formatter: customFormatter },
],

This will apply the custom formatter to the "value" column in your JQGrid, changing the background color of any negative values to red.