设置选择框的值

Question

I have the following select-box:

<select name="country">
    <option value="us">America</option>
    <option value="jp">Japan</option>
    <option value="cn">China</option>
    <option value="vi">Vietnam</option>
</select>

By default, the value of this select-box is "us" and the displayed text is "America". What I want to do is set the value of this select box to "jp" and set the text displayed on this select-box to "Japan" using javascript.

I can set the value to "jp" easily by setting the "selected" attribute to "true", but I can't change the text display on the select-box (It still display "America" instead of "Japan").

Are there anyone know how to do that?

Answer 1

You need to set the value of the select itself rather than set the options selected to true.

var element = document.getElementsByName('country')[0];
element.value = 'jp';

Answer 2

Can you try this, add selected="selected" based on your preference in HTML, Javascript document.getElementsByName('country')[0].value .

Using HTML:

<select name="country">
    <option value="us">America</option>
    <option value="jp" selected="selected" >Japan</option>
    <option value="cn">China</option>
    <option value="vi">Vietnam</option>
</select>

Using javascript:

  document.getElementsByName('country')[0].value = 'jp';

Answer 3

To use JavaScript, you could use...

selectElement.value = "jp";

jsFiddle .