Input Text value attribute

Objek Input Text DOM HTML

Definition and usage

value Set or return the value of the text field's value attribute.

The HTML value attribute contains a default value or a user input value (or a value set by the script).

See also:

HTML Reference Manual:Guna properti value <input> HTML

Instance

Example 1

Change the value of the text field:

document.getElementById("myText").value = "Bill Gates";

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More examples are provided below the page.

Syntax

Return value attribute:

textObject.value

Set value attribute:

textObject.value = text

Attribute value

Value Description
text Specify the value of the input text field.

Technical details

Return value: String value, represents the value of the text field.

Lebih banyak contoh

Contoh 2

Mendapatkan nilai medan teks:

var x = document.getElementById("myText").value;

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Contoh 3

Pengesahan borang:

var at = document.getElementById("email").value.indexOf("@");
var age = document.getElementById("age").value;
var fname = document.getElementById("fname").value;
submitOK = "true";
if (fname.length > 10) {
  alert("Nama mungkin tidak boleh melebihi 10 aksara");
  submitOK = "false";
}
if (isNaN(age) || age < 1 || age > 100) {
  alert("Umur mesti nombor antara 1 dan 100");
  submitOK = "false";
}
if (at == -1) {
  alert("Bukan e-mel yang sah!");
  submitOK = "false";
}
if (submitOK == "false") {
  return false;
}

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Contoh 4

Senarai pilihan dalam borang:

var mylist = document.getElementById("myList");
document.getElementById("favorite").value = mylist.options[mylist.selectedIndex].text;

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Contoh 5

Lagi senarai pilihan turun:

var no = document.getElementById("no");
var option = no.options[no.selectedIndex].text;
var txt = document.getElementById("result").value;
txt = txt + option;
document.getElementById("result").value = txt;

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Contoh 6

Paparan contoh perbezaan antara atribut defaultValue dan value:

var x = document.getElementById("myText");
var defaultVal = x.defaultValue;
var currentVal = x.value;

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Objek Input Text DOM HTML