Column conditional format with Json to display attention colour if column is blank

Hi Silas,

If you want to just get a specific background-color in the cell depending on the value of that column, you can use something like this:

{
   "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
   "elmType": "div",
   "txtContent": "@currentField",
   "style": {
      "background-color": {
         "operator": "?",
         "operands": [
            {
               "operator": "==",
               "operands": [
                 "@currentField", "High"
                  ]
            },
            "#FFA07A",
            ""
         ]
      }
   }
}

I have used the above code successfully to display the Priority column in red if the value is 'High'. The JSON example you have quoted is needed if you want to display the pre-configured icons as well, like what I have used here:

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "debugMode": true,
  "elmType": "div",
  "attributes": {
    "class": "=if(@currentField == 'Completed', 'sp-field-severity--good', if(@currentField == 'In Progress', 'sp-field-severity--low' ,if(@currentField == 'Not Started','sp-field-severity--warning', if(@currentField == 'Deferred','sp-field-severity--blocked', ''))"
  },
  "children": [
    {
      "elmType": "span",
      "style": {
        "display": "inline-block",
        "padding": "0 4px"
      },
      "attributes": {
        "iconName": "=if(@currentField == 'Completed','CheckMark', if(@currentField == 'In Progress', 'Forward', if(@currentField == 'Not Started', 'Error', if(@currentField == 'Deferred','Warning','')"
      }
    },
    {
      "elmType": "span",
      "txtContent": "@currentField"
    }
  ]
}

See the attached image to view how the list appears.