The property ‘value’ does not exist on value of type ‘HTMLElement’

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I am playing around with typescript and am trying to create a script that will update a p-element as text is inputted in a input box.

The html looks as following:

<html>
    <head>
    </head>
    <body>
        <p id="greet"></p>
        <form>
            <input id="name" type="text" name="name" value="" onkeyup="greet('name')" />
        </form>
    </body>
    <script src="https://stackoverflow.com/questions/12989741/greeter.js"></script>
</html>

And the greeter.ts file:

function greeter(person)
{
    return "Hello, " + person;
}

function greet(elementId)
{
    var inputValue = document.getElementById(elementId).value;

    if (inputValue.trim() == "")
        inputValue = "World";

    document.getElementById("greet").innerText = greeter(inputValue);
}

When I compile with tsc I get the following “error”:

/home/bjarkef/sandbox/greeter.ts(8,53): The property 'value' does not exist on value of type 'HTMLElement'

However the compiler does output a javascript file, which works just fine in chrome.

How come I get this error? And how can I fix it?

Also, where can I look up which properties are valid on a 'HTMLElement' according to typescript?

Please note I am very new to javascript and typescript, so I might be missing something obvious. 🙂

16 Answers
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