Select selectedIndex attribute

HTML DOM Select Obheto

Definition and Usage

selectedIndex Attribute that sets or returns the index (subscript) of the selected option in the dropdown list.

The index starts from 0.

Note:If the dropdown list allows multiple selections, it will only return the index of the first selected option.

Note:The value "-1" will deselect all options (if any).

Note:If no option is selected, the selectedIndex attribute will return -1.

See also:

HTML Reference Manual:HTML <select> Tag

Example

Example 1

Select the <option> element with index "2":

document.getElementById("mySelect").selectedIndex = "2";

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Example 2

Display the index and text of the selected option in the dropdown list:

var x = document.getElementById("mySelect").selectedIndex;
var y = document.getElementById("mySelect").options;
alert("Index: " + y[x].index + " is " + y[x].text);

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Example 3

Deselect all options:

document.getElementById("mySelect").selectedIndex = "-1";

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Example 4

If no option is selected, the selectedIndex attribute will return "-1":

var x = document.getElementById("mySelect").selectedIndex;

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Syntax

Return the selectedIndex attribute:

selectObject.selectedIndex

Set the selectedIndex attribute:

selectObject.selectedIndex = number

Halaga ng Atributo

Halaga Paglalarawan
number Tinutukoy ang indeks ng pinili na opsyon sa dropdown list (subscript).

Detalye ng Teknolohiya

Ibalik na Halaga:

Bilang, nangangahulugan ng indeks ng pinili na opsyon sa dropdown list. Ang indeks ay nagsisimula sa 0.

Kung hindi napili ang anumang opsyon, ang ibabalik na halaga ay -1.

Suporta ng Browser

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Chrome Edge Firefox Safari Opera
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HTML DOM Select Obheto