How To Make An Error Message When Someone Enters An Invalid Command

This link is to a Thimble project I'm working on using JS and Jquery. I'm making a text-based game, and I wondered if someone could help me make an error message appear so that whe

Solution 1:

With zero code and zero idea how your app actually works, this is the best I can give you.

// Create an array of acceptable commandsvar commands = [
  "command1",
  "command2",
  "command3"
];

// Get the command typed into the gamevar commandTyped = $("#command-line").val();


// Check if the command typed was in the array of acceptable commands// If not do somethingif( $.inArray( commandTyped, commands) == -1 ) {
  alert("That command doesn't exist");
}

Solution 2:

var commands = [
  "command1",
  "command2",
  "command3"
];

// Get the command typed into the gamevar commandTyped = $("#command-line").val();

if (commands.indexOf(commandTyped) === -1) {
    alert('Invalid command!');
}

indexOf will ensure browser compatibility. It returns -1 when a list doesn't contain an item.

Alternatively, you could use includes()

if (commands.includes(commandTyped)) { ...