te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>jquery - Looping through checkboxes with javascript - Stack Overflow

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    I have a number of checkboxes which I am wanting to check if they are checked (1) or not checked (0). I want to place the results in an array so that I can send them to the server to saved in a table. I have tried the below code:

    <input class="publish" id="chkBox1" type="checkbox" checked>
<input class="publish" id="chkBox2" type="checkbox" checked>
<input class="publish" id="chkBox3" type="checkbox" checked>
<input class="publish" id="chkBox4" type="checkbox" checked>
<input class="publish" id="chkBox5" type="checkbox" checked>

<script>
$('#save-btn').click(function(evt){
    evt.preventDefault();

    var numberOfChBox = $('.publish').length;
    var checkArray = new Array(); 

    for(i = 1; i <= numberOfChBox; i++) {

        if($('#chkBox' + i).is(':checked')) {
            checkArray[i] = 1;  
        } else {
        checkArray[i] = 0;
        }
    }
    alert(checkArray);
});
</script>

    but the alert outputs this:

    ,1,0,1,0,1,1

    The values are correct except the first index in undefined. There are only a total of 5 checkboxes and yet the array is 6 indexes long. Why is this?

    I have a number of checkboxes which I am wanting to check if they are checked (1) or not checked (0). I want to place the results in an array so that I can send them to the server to saved in a table. I have tried the below code:

    <input class="publish" id="chkBox1" type="checkbox" checked>
<input class="publish" id="chkBox2" type="checkbox" checked>
<input class="publish" id="chkBox3" type="checkbox" checked>
<input class="publish" id="chkBox4" type="checkbox" checked>
<input class="publish" id="chkBox5" type="checkbox" checked>

<script>
$('#save-btn').click(function(evt){
    evt.preventDefault();

    var numberOfChBox = $('.publish').length;
    var checkArray = new Array(); 

    for(i = 1; i <= numberOfChBox; i++) {

        if($('#chkBox' + i).is(':checked')) {
            checkArray[i] = 1;  
        } else {
        checkArray[i] = 0;
        }
    }
    alert(checkArray);
});
</script>

    but the alert outputs this:

    ,1,0,1,0,1,1

    The values are correct except the first index in undefined. There are only a total of 5 checkboxes and yet the array is 6 indexes long. Why is this?

    • javascript
    • jquery
    • html
    Share Improve this question asked Apr 26, 2014 at 7:06 Nick LawNick Law 1,7483 gold badges19 silver badges27 bronze badges
    Add a ment  | 

    3 Answers 3

    Reset to default 6

    Try this efficient way bruvo :) http://jsfiddle/v4dxu/ with proper end tag in html: http://jsfiddle/L4p5r/

    Pretty good link: https://learn.jquery./javascript-101/arrays/

    Also in your html end your tag /> i.e.

    <input class="publish" id="chkBox4" type="checkbox" checked>

    rest should help :)

    Code

    var checkArray = new Array(); 
$('input[type=checkbox]').each(function () {
    this.checked ? checkArray.push("1") : checkArray.push("0");
});

alert(checkArray);

    As mentioned in the answers above the problem is with the index(i). But if you want to simplify the code further, How about the following code?

    var checkArray = [];

$('input.publish').each(function () {
   checkArray.push($(this).is(':checked'));
});

alert(checkArray);

    Take into account that the first element you write is checkArray[1], as i starts with 1, instead of checkArray[0].

    Replace checkArray[i] with checkArray[i-1] inside the for bucle

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