How can I check a checkbox when another checkbox is checked? [JavaScript]

Question

So I have a little form which you can see at the bottom. And I want to know how I can make a JavaScript function where if I, for example, check checkbox 3 it will also check checkboxes 2 and 1. I have been on the internet looking for hours now and most stuff either doesn't wanna work or involves jQuery. I'd rather use HTML/JavaScript only.

I thank you for taking your time to at least read this!

<h3>HTML</h3>
    <label><input type="checkbox" name="html1" value="html1" id="html1"/><span class="label-text"></span></label>
    <label><input type="checkbox" name="html2" value="html2" id="html2"/><span class="label-text"></span></label>
    <label><input type="checkbox" name="html3" value="html3" id="html3"/><span class="label-text"></span></label>
    <label><input type="checkbox" name="html4" value="html4" id="html4"/><span class="label-text"></span></label>
    <label><input type="checkbox" name="html5" value="html5" id="html5"/><span class="label-text"></span></label>

otto · Accepted Answer · 2018-03-21 22:08:27Z

2

<label><input onclick="onToggle()" type="checkbox" name="html3" value="html3" id="html3"/><span class="label-text"></span></label>

I think that way you can do it with plain Javascript

function onToggle(){
       if (document.querySelector('#html3').checked) {
          // if checked
          console.log('checked');
          document.getElementById("html2").checked = true
          document.getElementById("html1").checked = true
        } else {
          // if unchecked
          console.log('unchecked');
        }
}

answered Mar 21, 2018 at 22:08

otto

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1 Comment

Rik Rödel Over a year ago

this seems to work! Thank you so much! I've been trying for hours to get something like this working.

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