仅使用 javascript 设置一个复选框即可启用所有其他复选框

Question

I'm really struggling with this. I want to use Jquery for this but it's not allowed unfortunately. So for a little exercise I need to let one checkbox check enable all other checkboxes. No it doesn't need to check them but just enable them. Here is my HTML code:

 <table border="0"> <tr> <th id="thproductid"; colspan="2"; width="300px">Pizza</th> <th id="thproductid"; colspan="2"; width="150px"><input type="checkbox" name="pizzamedium" id="checkpizzamedium" onclick="Activeer(this)"> Medium</th> <th id="thproductid"; colspan="3"; width="50px">Aantal</th> <th width="100px"></th> <th id="thproductid"; colspan="2"; width="150px"><input type="checkbox" name="pizzalarge" id="checkpizzalarge" onclick="Activeer(this)"> Large</th> <th id="thproductid"; colspan="3"; width="50px">Aantal</th> <th width="100px"></th> </tr> <tr> <th id="tdid">1</th> <td id="tdproductid"> Margeritha</td> <td id="tdprijsid"> &#8364 7,50</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzamedium" id="Margeritham" value="Pizza Margeritha M" onclick="" disabled></td> <td><input type="button" id="plusknopmargerithaM" value=" + " onclick="" disabled></td> <td><input type="button" id="minknopmargerithaM" value=" - " onclick="" disabled></td> <td><input type="text" size="5" name="aantalpizzasmargerithaM" id="aantalpizzasmargerithaM" value="0" disabled></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input disabled type="button" id="bestelknopmargarithaM" value="Toevoegen" onclick=""></td> <td id="tdprijsid"> &#8364 12,00</td> <td id="tdcheckboxid"><input disabled type="checkbox" name="pizzalarge" id="Margerithal" value="Pizza Margeritha L" onclick=""></td> <td><input disabled type="button" id="plusknopmargerithaL" value=" + " onclick=""></td> <td><input disabled type="button" id="minknopmargerithaL" value=" - " onclick=""></td> <td><input disabled type="text" size="5" name="aantalpizzasmargerithaL" id="aantalpizzasmargerithaL" value="0"></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input disabled type="button" id="bestelknopmargarithaL" value="Toevoegen" onclick=""></td> </tr> <tr> <th id="tdid">2</th> <td id="tdproductid"> Bolognaise</td> <td id="tdprijsid"> &#8364 9,00</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzamedium" id="Bolognaisem" value="Pizza Bolognaise M" onclick="" disabled></td> <td><input disabled type="button" id="plusknopbolognaiseM" value=" + " onclick=""></td> <td><input disabled type="button" id="minknopbolognaiseM" value=" - " onclick=""></td> <td><input type="text" disabled size="5" name="aantalpizzasbolognaiseM" id="aantalpizzasbolognaiseM" value="0"></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input type="button" disabled id="bestelknopbolognaiseM" value="Toevoegen" onclick=""></td> <td id="tdprijsid"> &#8364 13,50</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzalarge" id="Bolognaisel" value="Pizza Bolognaise L" onclick="" disabled></td> <td><input type="button" id="plusknopbolognaiseL" value=" + " onclick="" disabled></td> <td><input type="button" id="minknopbolognaiseL" value=" - " onclick="" disabled></td> <td><input type="text" size="5" name="aantalpizzasbolognaiseL" id="aantalpizzasbolognaiseL" value="0" disabled></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input type="button" id="bestelknopbolognaiseL" value="Toevoegen" onclick="" disabled></td> </tr> <tr> <th id="tdid">3</th> <td id="tdproductid"> Calzone</td> <td id="tdprijsid"> &#8364 10,00</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzamedium" id="Calzonem" value="Pizza Calzone M" onclick="" disabled></td> <td><input type="button" id="plusknopcalzoneM" value=" + " onclick="" disabled></td> <td><input type="button" id="minknopcalzoneM" value=" - " onclick="" disabled></td> <td><input type="text" size="5" name="aantalpizzascalzoneM" id="aantalpizzascalzoneM" value="0" disabled></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input type="button" id="bestelknopcalzoneM" value="Toevoegen" onclick="" disabled></td> <td id="tdprijsid"> &#8364 16,50</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzalarge" id="Calzonel" value="Pizza Calzone L" onclick="" disabled></td> <td><input type="button" id="plusknopcalzoneL" value=" + " onclick="" disabled></td> <td><input type="button" id="minknopcalzoneL" value=" - " onclick="" disabled></td> <td><input type="text" size="5" name="aantalpizzascalzoneL" id="aantalpizzascalzoneL" value="0" disabled></td> <td id="tdtoevoegenknopid"; align="center" class="verstopt"><input type="button" id="bestelknopcalzoneL" value="Toevoegen" onclick="" disabled></td> </tr> <tr> <th id="tdid">4</th> <td id="tdproductid"> Pollo</td> <td id="tdprijsid"> &#8364 10,00</td> <td id="tdcheckboxid"><input type="checkbox" name="pizzamedium" id="Pollom" value="Pizza Pollo M" onclick="" disabled></td> <td><input type="button" id="plusknoppolloM" value=" + " onclick..

Here is my JS code:

 function Activeer(adres, checkbox1id, checkbox2id, checkbox3id, checkbox4id, checkbox5id, checkbox6id, checkbox7id, checkbox8id) { if(adres.checked) { document.getElementById(checkbox1id).disabled = ""; document.getElementById(checkbox2id).disabled = ""; document.getElementById(checkbox3id).disabled = ""; document.getElementById(checkbox4id).disabled = ""; document.getElementById(checkbox5id).disabled = ""; document.getElementById(checkbox6id).disabled = ""; document.getElementById(checkbox7id).disabled = ""; document.getElementById(checkbox8id).disabled = ""; } }

Answer 1

Give all of your checkboxes the same class, then assign every checkbox but one the disabled attribute. *

EDIT

*No need to hardcode the disabled attribute, the demo has the capability to programmatically change the state of the checkboxes now.

I added a JavaScript solution and commented out the jQuery, if you'd like to test it out as well, just remove the comment marks and place them on the JS function.

var chxs = document.querySelectorAll('.chx');

var check = document.querySelector('input[type="checkbox"]');

check.addEventListener('change', function() {
  var chxArr = Array.prototype.map.call(chxs, function(obj, i) {

    if (obj.getAttribute('disabled')) {
      return obj.removeAttribute('disabled');
    } else {
      return obj.setAttribute('disabled', true);
    }
  });
}, false);

Details are commented in the source of the following Snippet:

SNIPPET

 /* $('.chx').on('change', function() { $('.chx').removeAttr('disabled'); }); */ // Collect all elements with class .chx into a NodeList var chxs = document.querySelectorAll('.chx'); // Reference the first checkbox found var check = document.querySelector('input[type="checkbox"]'); /* | - Add an eventListener to the first checkbox | - If a change event fires on the checkbox... */ check.addEventListener('change', function() { /* | - Convert the NodeList chxs into an array called chxArr with | map and call methods. | - On each iteration... */ var chxArr = Array.prototype.map.call(chxs, function(obj, i) { /* | - If the checkbox(obj) has the attribute "disabled"... | -...remove the "disabled" attribute... | - ...otherwise add the "disabled attribute to it. */ if (obj.getAttribute('disabled')) { return obj.removeAttribute('disabled'); } else { return obj.setAttribute('disabled', true); } // Lather, rinse, and repeat... }); }, false);

 <!doctype html> <html> <head> <meta charset="utf-8"> <title>CHX</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> </head> <body> <div>ENABLE/DISABLE ALL <input type='checkbox'> </div> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> <input type='checkbox' class='chx'> <br/> </body> </html>

Answer 2

Notes about your code:

1. Hardcoding the process is the last thing you'd want to do in this case.
2. Setting element.disabled = "" doesn't remove the attribute and the element will stay disabled nonetheless.

Solution:

I didn't want to change too much the code you already have, so I went ahead and removed the hardcoding you've done by using a for loop to iterate through the elements you pass as arguments (except the first one [adres] ) and disabling them one-by-one.

I also changed element.disabled = "" to element.removeAttribute("disabl‌​ed") , because as mentioned above, the former doesn't actually remove the attribute.

function Activeer() {
  var
    adres = arguments[0], /* The first argument should be adres */
    args = [].slice.call(arguments, 1); /* Every element you want enabled */

  if (adres.checked) {
    for (var i = 0; i < args.length; i++) args[index].removeAttribute("disabl‌​ed");
  }
}

One last note:

I believe this solution will work as you want, but I'd still encourage you to use a common attribute though (like the same class or name ) , as everything will be significantly simpler since you want have to pass countless arguments for each element you want enabled.

Example:

Let's suppose you give them a class: class = "checkboxes" .

function Activeer(adres) {
  var elements = document.querySelectorAll(".checkboxes");
  if (adres.checked) for (var i = 0; i < elements.length; i++) {
      args[index].removeAttribute("disabl‌​ed");
  }
}