检查是否至少选择了一个复选框 PER questio.n

Question

我们又来了，搜索并尝试了自己，但没有一个在线示例与我的情况不同。 我有 2 个基于无线电的问题和其他 22 个带有复选框的问题。 我的问题是如何检查是否在每个问题上至少选择了 1 个复选框/收音机并显示 javascript 警报以防它们没有 EG : “你必须在第 3 题上至少选择一个答案”。

注意：警报必须包含问题编号。 CHECK 必须在表单提交时完成（如果失败将返回 false ，否则将返回 true 并将被处理。）

下面的例子：

<tr><th>- Question 1</th></tr>
<tr><td><input name="01" type="radio" id="01" value="F">
F</td></tr>
<tr><td><input name="01" type="radio" id="01" value="B">
B</td></tr>

<tr><th>- Question 2</th></tr>
<tr><td><input name="02" type="radio" id="02" value="9">
9</td></tr>
<tr><td><input name="02" type="radio" id="02" value="10">
10</td></tr>
<tr><td><input name="02" type="radio" id="02" value="11">
11</td></tr>
<tr><td><input name="02" type="radio" id="02" value="12">
12</td></tr>

<tr><th> Question 3</tr></th>
<tr><td><input name="c1" type="checkbox" id="c1" value="a">
This is checkbox1</td></tr>
<tr><td><input name="c1" type="checkbox" id="c1" value="b">
This is checkbox2</td></tr>

Answer 1

EDIT - 看到标记后编辑

$('form').submit(function() {
    var ok = true;
    var that = this;
    //get the <tr> inside the function, i assume thatyou have one question per <tr>
    $('tr th', this).each(function(idx, el) {
        var id = this.id;
        if (id) {
            if ($('input:checked[name=' + id + ']', that).length === 0) {
                alert("You must check at least one option for question " + $(this).text());
                ok = false;
            }
        }
    });
    if (ok === false) {
        return false;
    }
});

这是我使用的标记（这里小提琴http://jsfiddle.net/R7uwa/2/）

<form id="chestionar" name="chestionar" method="post" action="prelucrare_chest.php">

    <table style="width:100%; border-spacing:0;">
    <tbody><tr><th>- Selectati sex-ul:</th></tr>
    <tr><td><input type="radio" value="F" id="01" name="01">
    Fata</td></tr>
    <tr><td><input type="radio" value="B" id="01" name="01">
    Baiat</td></tr>

    <tr><th>- Selectati clasa:</th></tr>
    <tr><td><input type="radio" value="9" id="02" name="02">
    9</td></tr>
    <tr><td><input type="radio" value="10" id="02" name="02">
    10</td></tr>
    <tr><td><input type="radio" value="11" id="02" name="02">
    11</td></tr>
    <tr><td><input type="radio" value="12" id="02" name="02">
    12</td></tr>

    <tr><th id="c1">1. Care sunt motivele pentru care absentezi tu si colegii tai?</th></tr>
    <tr><td><input type="checkbox" value="a" id="c1" name="c1">
    Nu ne place ora</td></tr>
    <tr><td><input type="checkbox" value="b" id="c1" name="c1">
    Nu ne intereseaza scoala</td></tr>
    <tr><td><input type="checkbox" value="c" id="c1" name="c1">
    Nu ne place profesorul</td></tr>
    <tr><td><input type="checkbox" value="d" id="c1" name="c1">
    Daca absentam nu ni se întâmpla mare lucru</td></tr>
    <tr><td><input type="checkbox" value="e" id="c1" name="c1">
    Ne plictisim la scoala</td></tr>
    <tr><td><input type="checkbox" value="f" id="c1" name="c1">
    Facem usor rost de scutiri pentru motivarea absentelor</td></tr>
    <tr><td><input type="checkbox" value="g" id="c1" name="c1">
    Evitam în felul acesta luarea unei note mici</td></tr>
    <tr><td><input type="checkbox" value="h" id="c1" name="c1">
    Nu dorim sa intram în conflict cu ceilalti colegi</td></tr>
    <tr><td><input type="checkbox" value="i" id="c1" name="c1">
    Programul este prea încarcat</td></tr>



    <tr><th id='c2'>2. Ce se întâmpla când un elev absenteaza nemotivat mai mult timp?</th></tr>
    <tr><td><input type="checkbox" value="a" id="c2" name="c2">
    I se scade nota la purtare</td></tr>
    <tr><td><input type="checkbox" value="b" id="c2" name="c2">
    Sunt chemati parintii lui la scoala</td></tr>
    <tr><td><input type="checkbox" value="c" id="c2" name="c2">
    Este mustrat de catre diriginte</td></tr>
    <tr><td><input type="checkbox" value="d" id="c2" name="c2">
    Este evaluat la ora urmatoare si este depunctat la nota</td></tr>
    <tr><td><input type="checkbox" value="e" id="c2" name="c2">
    Este exmatriculat</td></tr>
    <tr><td><input type="checkbox" value="f" id="c2" name="c2">
    Nu se întâmpla mare lucru</td></tr>

    <tr><th id='c3'>3. Cât de des absentezi nemotivat?</th></tr>
    <tr><td><input type="checkbox" value="a" id="3" name="3">
    Deloc</td></tr>
    <tr><td><input type="checkbox" value="b" id="c3" name="c3">
    1-3 ore pe saptamâna</td></tr>
    <tr><td><input type="checkbox" value="c" id="c3" name="c3">
    3-6 ore pe saptamâna</td></tr>
    <tr><td><input type="checkbox" value="d" id="c3" name="c3">
    6-9 ore pe saptamâna</td></tr>
    <tr><td><input type="checkbox" value="e" id="c3" name="c3">
    9-12 ore pe saptamânat</td></tr>
    <tr><td><input type="checkbox" value="f" id="c3" name="c3">
    12-15 ore pe saptamâna</td></tr>
    <tr><td><input type="checkbox" value="g" id="c3" name="c3">
    Peste 15 ore pe saptamâna</td></tr>
    </tbody></table>
    <div class="form_settings"><p style="padding-top: 15px"><span>&nbsp;</span><input type="submit" value="Trimite" name="contact_submitted" class="submit"></p></div></form>

Answer 2

输入名称="c1[]" type="checkbox" id="c1" value="a"

输入名称="c1[]" type="checkbox" id="c1" value="b"

$(document).ready(function() { $('form').submit(function(){ var checkbox_value = []; $('#c1:checked').each(function(i){ checkbox_value[i] = $(this).val(); }); if(checkbox_value==""){ alert("Please Check Minimum One"); return false; } }

`