在我改变减少的菜单选择时,Im目前利用以下手段展示一个投入领域:
<select id="delivery_country" name="d_country" onchange="
if (this.selectedIndex==14){
this.form[ statesUSA ].style.visibility= visible
}else {
this.form[ statesUSA ].style.visibility= hidden
};">
然而,这只是修改了称为“状态”的投入形式要素。
如果我要表明,这一形式要素已经存在,我如何这样做?
关于记录,我的超文本如下:
<div id="usa">
<input type="text" id="statesUSA" />
</div>
许多人感谢任何要点。
http://www.cElementById(id)。
因此:
<select id="delivery_country" name="d_country" onchange="if (this.selectedIndex==14){document.getElementById( usa ).style.visibility= visible }else {document.getElementById( usa ).style.visibility= hidden };">
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