I'm new to javascript and am trying to write a simple script that will open 1 form upon checking a radio button, and another form upon clicking on the second one (none when none is selected). I'm positive the js code is totally wrong as I am a COMPLETE beginner with js, but I used logic and a bit of google to get to this, and I don't know where I went wrong.
var ele1 = document.getElementsByClassName("form1"); var ele2 = document.getElementsByClassName("form2"); if (document.getElementById('button1').checked) { ele1.style.display = "block"; } if (document.getElementById('button2').checked) { ele2.style.display = "block"; }
.form1 { display: none; background-color: red; width: 100px; height: 100px; }.form2 { display: none; background-color: blue; width: 100px; height: 100px; }
<input type="radio" name="role" id="button1"> <input type="radio" name="role" id="button2"> <div class="form1"> </div> <div class="form2"> </div> <script src="/scripts/form.java"></script>
This code isn't wrong as such, but it only ever executes once; when the page loads. You instead want the forms to be toggled whenever the inputs are changed.
To do this, the visibility code is wrapped in a function. This function is then registered as an event handler on the <input>
elements so that it executes whenever the <input>
s change. Whenever the selected radio button changes, by clicking or by keyboard navigation, an 'input'
event will be triggered on the elements, and then handled by the function.
I've also made a few other changes:
id
s since this is specific functionality for a handful of specific elements.<form>
elements for better semantics. All forms must be wrapped in a <form>
element at some level..java
to .js
– JavaScript and Java are (unintuitively) unrelated.name
on the <input>
s to better describe their role.<input type="radio" name="formID" id="input1">
<input type="radio" name="formID" id="input2">
<form id="form1">
<!-- fields -->
</form>
<form id="form2">
<!-- fields -->
</form>
<script src="/scripts/form.js"></script>
// form.js
// Get references to important elements.
var elInput1 = document.getElementById('input1');
var elInput2 = document.getElementById('input2');
var elForm1 = document.getElementById('form1');
var elForm2 = document.getElementById('form2');
// Define an event handler function.
function updateFormVisibility(event) {
var elSelectedInput = event.target;
if (elSelectedInput.id === 'input1') {
elForm1.style.display = 'block';
elForm2.style.display = '';
} else {
elForm1.style.display = '';
elForm2.style.display = 'block';
}
}
// Register the function as a handler for any `'input'` events that occur on the
// two radio button elements.
elInput1.addEventListener('input', updateFormVisibility);
elInput2.addEventListener('input', updateFormVisibility);
According to @Mehdi Brillaud's answer here: https://stackoverflow.com/a/42488571/13695248 , you could try this with JQuery:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <label><input type="radio" class="form-switch" name="colorCheckbox" value="red" data-id="a" checked> red</label> <label><input type="radio" class="form-switch" name="colorCheckbox" value="green" data-id="b"> green</label> <label><input type="radio" class="form-switch" name="colorCheckbox" value="blue" data-id="c"> blue</label> <div class="form form-a active"> form a </div> <div class="form form-b"> form b </div> <div class="form form-c"> form c</div>
.form { display: none; }.form.active { display: block }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script> $(document).ready(function() { $('.form-switch').on('change', function() { $('.form').removeClass('active'); var formToShow = '.form-' + $(this).data('id'); $(formToShow).addClass('active'); }); }); </script>
Is this what you want?
For modern browsers:- (Not recommend)
<input type="radio" name="role" id="button1" onchange = "form1.style.display ='block'; form2.style.display ='none'">
<input type="radio" name="role" id="button2" onchange = "form1.style.display ='none'; form2.style.display ='block'">
<div class="form1" id ="form1" style="display:none">Form 1
</div>
<div class="form2" id ="form2" style="display:none">Form 2
</div>
<script src="/scripts/form.js"></script>
Update
Recommend
<input type="radio" name="role" id="button1" onchange = "Show('form1')">
<input type="radio" name="role" id="button2" onchange = "Show('form2')">
<div class="form1" id ="form1" style="display:none">Form 1
</div>
<div class="form2" id ="form2" style="display:none">Form 2
</div>
<script src="/scripts/form.js"></script>
<script>
var selected = document.getElementById("form1");
function Show(curr_sel) {
selected.style.display = "none";
selected = document.getElementById(curr_sel);
selected.style.display = "block";
}
</script>
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