javascript - How can get CheckBox Array length in java script - Stack Overflow

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in my jsp form i have one checkbox Array in my form(jsp and struts).i want to know the length of checkbox Array in java script. ex: <input:checkbox property="chkbox[]"/> . in javascript i am calling document.form[0].chkbox[].value.length but it showing javaScript error null or undefined .

in my jsp form i have one checkbox Array in my form(jsp and struts).i want to know the length of checkbox Array in java script. ex: <input:checkbox property="chkbox[]"/> . in javascript i am calling document.form[0].chkbox[].value.length but it showing javaScript error null or undefined .

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Share Improve this question Follow edited Dec 1, 2011 at 11:08 Sai Kalyan Kumar Akshinthala 11.8k88 gold badges4545 silver badges6868 bronze badges asked Dec 1, 2011 at 11:03 java_devjava_dev 12533 gold badges33 silver badges1313 bronze badges

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2 Answers 2

Sorted by: Reset to default 3

    var checkbox = document.getElementsByName('a_checkbox')
    var ln = checkbox.length

line 1 get all the active checked boxes line 2 in the length of that array

if this the html

<form name='form1' >
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
<input type=checkbox name='cbox' />
</form>

javascript for that length would be

alert(document.form1.cbox.length);

or you can also use.

document.getElementsByName('cbox').length

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