How to show field error in JS Controller in Salesforce?

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*errorHandlingController.js*/
{
    doAction : function(component) {
        var inputCmp = component.find("inputCmp");
        var value = inputCmp.get("v.value");
 
        // Is input numeric?
        if (isNaN(value)) {
            // Set error
            inputCmp.set("v.errors", [{message:"Input not a number: " + value}]);
        } else {
            // Clear error
            inputCmp.set("v.errors", null);
        }
    }
}

<button data-clipboard-text="/*errorHandlingController.js*/ { doAction : function(component) { var inputCmp = component.find("inputCmp"); var value = inputCmp.get("v.value"); // Is input numeric? if (isNaN(value)) { // Set error inputCmp.set("v.errors", [{message:"Input not a number: " + value}]); } else { // Clear error inputCmp.set("v.errors", null); } } } "></button>
When you enter a value and click Submit, <samp>doAction</samp> in the contro

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