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javascript: ¿cómo puedo imprimir un mensaje de error pero solo si ya hay algo en el cuadro de texto?

Tengo 2 cuadros de texto. Las entradas no pueden coincidir, pero no quiero que aparezca un mensaje de error cuando ambos estén vacíos solo cuando se haya ingresado algo en ambos cuadros. ¿Cómo hago esto?

 function validate() { var errorMessage = ""; var textbox4Input = document.getElementById("fictional"); var textbox5Input = document.getElementById("real"); var textbox4 = textbox4Input.value.trim(); var textbox5 = textbox5Input.value.trim(); textbox4Input.value = textbox4; textbox5Input.value = textbox5; if (textbox4 === textbox5) { errorMessage += "Favorite fictional place & favorite real place cannot be the same.<br>" } return errorMessage; }
about 4 years ago · Juan Pablo Isaza
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