如何檢查多個復選框中是否選中了至少一個復選框？

Question

在我的表單中使用了很多復選框。 我想檢查是否至少選中了一個復選框。

<div id="sun">
    <li><?php echo $this->__("SUN");?> </li>
    <li><input class="allday" type="checkbox" name="availableday[Sunday][9-12]" value="9AM - 12AM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Sunday][12-6]" value="12PM - 6PM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Sunday][6-9]" value="6PM - 9PM"></li>
</div>
<div id="mon">
    <li><?php echo $this->__("MON");?> </li>
    <li><input class="allday" type="checkbox" name="availableday[Monday][9-12]" value="9AM - 12AM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Monday][12-6]" value="12PM - 6PM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Monday][6-9]" value="6PM - 9PM"></li>
</div>
<div id="tue">
    <li><?php echo $this->__("TUE");?> </li>
    <li><input class="allday" type="checkbox" name="availableday[Tuesday][9-12]" value="9AM - 12AM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Tuesday][12-6]" value="12PM - 6PM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Tuesday][6-9]" value="6PM - 9PM"></li>
</div>
<div id="wed">
    <li><?php echo $this->__("WED");?> </li>
    <li><input class="allday" type="checkbox" name="availableday[Wednesday][9-12]" value="9AM - 12AM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Wednesday][12-6]" value="12PM - 6PM"></li>
    <li><input class="allday" type="checkbox" name="availableday[Wednesday][6-9]" value="6PM - 9PM"></li>
</div>

如何驗證至少一個復選框？

Answer 1

好吧，直截了當：

var isSomeAlldayCheckboxChecked = document
  .querySelectorAll('input[type="checkbox"].allday')
  .some(function (each) { return each.checked; });

Answer 2

以下內容：

var formNodes  = document.checks.getElementsByTagName('input');
for (var i=0;i<formNodes.length;i++) {
   /* If one is true set a variable to true and exit the loop */
}

堆棧溢出帖在這里

干杯，

Truez

Answer 3

var count= 0;
var value_array=new Array();
jQuery('input[type="checkbox"]:checked').each(function(){ 
   value_array.push(jQuery(this).val());
   count = count + 1;
});

// count&value_array will tell you total selected

Answer 4

您可以使用Jquery。

if ($('#form_id :checkbox:checked').length > 0)
{
        // one or more checkboxes are checked
}
else
{
       // no checkboxes are checked
}

Answer 5

@ herby的答案是檢查input[type='checkbox']數組中的某些輸入是否被檢查的正確答案。

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此答案使用querySelectorAll （ MyFormManager.get_checkedInputs ）返回已檢查輸入的數組; 它演示了向查詢添加事件監聽器input元素change事件（ MyFormManager.init ） - 它將檢查狀態附加到元素的className （ MyFormManager.onCheckChanged ） - 以方便該過程。

 var MyFormManager = { checkboxes: null, onCheckChanged: function(sender, e) { console.log("sender:= %o, e:= %o", sender, e); sender.className = sender.className.replace(' true','').replace(' false',''); sender.className += ' ' + String(sender.checked); }, init : function() { checkboxes = document.querySelectorAll("input[type='checkbox']"); for (var i = 0, max = checkboxes.length; i < max; i++) { checkboxes[i].addEventListener('change', MyFormManager.onCheckChanged.bind(null, checkboxes[i])); } }, get_checkedInputs : function() { return document.querySelectorAll("input[type='checkbox'].true"); } } console.log(MyFormManager); MyFormManager.init(); var message = document.querySelector("div#message"); document.querySelector("button#runCheck").addEventListener("click", function (e) { var checkedInputs = MyFormManager.get_checkedInputs(); console.log(checkedInputs); message.innerHTML = ""; var parentId; for (var i = 0, max = checkedInputs.length; i < max; i++) { parentId = checkedInputs[i].parentNode.parentNode.parentNode.id; message.innerHTML += '<div class="item"><span class="parentId">' + parentId + '</span><span class="checkedInput">' + checkedInputs[i].value + '</span></div>'; } }); 

 body {background-color:whitesmoke;} div { display:block;} div > ul { list-style:none; margin:0.5em auto 0 auto; padding:0.27em; background-color:white; border:0.05cm solid silver; } input[type='checkbox'] {cursor:pointer;} div:first-child > ul:first-child {margin-top:0em;} div > ul > li {list-style:none;} div > ul > li > label {display:inline-block;padding:0.1em 0.3em;margin:0;width:8em;text-align:right;} div.item {display:block;} div.item > span.parentId {display:inline-block;width:3em;text-transform:uppercase;} div.item > span.checkedInput {display:inline-block;width:8em;text-align:right;} 

 <div id="debugger"> <div id='message'></div> <button id='runCheck'>Run Check</button> </div> <div id="sun"> <ul> <li><!-- <?php echo $this->__("SUN");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Sunday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Sunday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Sunday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="mon"> <ul> <li><!-- <?php echo $this->__("MON");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Monday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Monday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Monday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="tue"> <ul> <li><!-- <?php echo $this->__("TUE");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Tuesday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Tuesday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Tuesday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="wed"> <ul> <li><!-- <?php echo $this->__("WED");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Wednesday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Wednesday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Wednesday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="thur"> <ul> <li><!-- <?php echo $this->__("THUR");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Thursday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Thursday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Thursday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="fri"> <ul> <li><!-- <?php echo $this->__("FRI");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Friday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Friday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Friday][6-9]" value="6PM - 9PM"> </li> </ul> </div> <div id="sat"> <ul> <li><!-- <?php echo $this->__("SAT");?> --></li> <li> <label>9AM - 12PM</label> <input class="allday" type="checkbox" name="availableday[Saturday][9-12]" value="9AM - 12PM"> </li> <li> <label>12PM - 6PM</label> <input class="allday" type="checkbox" name="availableday[Saturday][12-6]" value="12PM - 6PM"> </li> <li> <label>6PM - 9PM</label> <input class="allday" type="checkbox" name="availableday[Saturday][6-9]" value="6PM - 9PM"> </li> </ul> </div> 

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請注意，這不是優化的，也不考慮動態控件（回發或xhr）;

Answer 6

如果您使用的是受支持的瀏覽器 ，則可以使用：checked偽選擇器進行非常簡潔的檢查。 只需做這樣的事情：

if(document.forms[0].querySelector('input[type="checkbox"]:checked').length) {
  //At least 1 checkbox is selected within document
}

請務必指定正確的形式，或者通過document.querySelector或document.forms文檔對象名單上（如上所示）。