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JavaScript 檢查 Radio Button

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ChungChung
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要用 JavaScript 來檢查同一組的 radio button 是否已選,可用以下方法:

if ((theForm.radiobutton[0].checked==false)
&& (theForm.radiobutton[1].checked==false)
&&(theForm.radiobutton[2].checked==false)) {alert('此選項未選。');
return false;
}

也就是要將 radio button 視為陣列,來檢查它們 checked 是 true 或 false。
至於 checkbox 則是直接檢查 checkbox.checked,而在 PHP 裡則要直接讀出它的值,例如
$_REQUEST["checkbox"]
https://innstory.com/story-JavaScript_檢查_Radio_Button-140

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Chung

我是chung
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