Javascript document.getElementById issue

StackOverflow https://stackoverflow.com/questions/22263244

  •  11-06-2023
  •  | 
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質問

I am a beginner to javascript, and am trying to learn how to use text boxes because I can't seem to find a page that is simple enough for me. This is what I have, but when I click the button, it just returns [object HTMLInputElement]. Could someone please tell me what i did wrong and help me fix it? Thanks.

<html>
<head>
<script language="javascript">
function displaynumber(){
var number1= document.getElementById("num1");
alert(number1).value
}
</script>
<title>
ok
</title>
</head>
<body>
<form>
Input the first number<input type="text" id="num1">
<input type="button" value="submit" onClick="displaynumber()">
</form>
</body>
</html>
役に立ちましたか？

解決

You should correct your typo:

alert(number1).value

to

alert(number1.value)

他のヒント

You are alerting number1 and then trying to read the value property of the return value of alert().

Move the property accessor inside the function call.

alert(
    number1.value
);
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