I want to create an assign form, for example user select teacher A for subject A but user can press a button to add more teacher to subject A. I heard this can be done by Javascript but I dont know how.
<div class="form-group row">
<label class="col-sm-2 col-form-label">Teacher</label>
<div class="form-group">
<select class="form-control" name="teachername">
<option>Sarah</option>
<option>Adam</option>
<option>Mark</option>
<option>Anderson</option>
<option>Wood</option>
</select>
</div>
<div class="ml-auto p-2">
<button type="button" class="btn btn-primary">+</button>
</div>
</div>
If you want user/student A to select multiple teachers for Subject Maths(example), you can use select with checkbox because the user doesn't know how many teachers are available for a particular subject.
Further, you can also implement check/uncheck all functionality
var expanded = false;
var checkboxes = document.getElementById("checkboxes");
var inputs = checkboxes.getElementsByTagName('input')
function showCheckboxes() {
if (!expanded) {
checkboxes.style.display = "block";
expanded = true;
} else {
checkboxes.style.display = "none";
expanded = false;
}
}
function getSelectedCheckboxValues(name) {
const checkboxe = document.querySelectorAll(`input[name="${name}"]:checked`);
let values = [];
checkboxe.forEach((checkbox) => {
values.push(checkbox.value);
});
return values;
}
function mySubmitFunction(e) {
e.preventDefault();
console.log(getSelectedCheckboxValues('teacher'));
return false;
}.multiselect {
width: 200px;
}
.selectBox {
position: relative;
}
.selectBox select {
width: 100%;
font-weight: bold;
}
.overSelect {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
}
#checkboxes {
display: none;
border: 1px #dadada solid;
}
#checkboxes label {
display: block;
}
#checkboxes label:hover {
background-color: #1e90ff;
}
.submitBtn {
margin-top: 15px;
cursor: pointer;
}<form onsubmit="return mySubmitFunction(event)">
<div class="multiselect">
<div class="selectBox" onclick="showCheckboxes()">
<select>
<option>Select an option</option>
</select>
<div class="overSelect"></div>
</div>
<div id="checkboxes">
<label for="first">
<input type="checkbox" name="teacher" value="first" id="first" />First Teacher</label>
<label for="second">
<input type="checkbox" name="teacher" value="second" id="second" />Second Teacher</label>
<label for="three">
<input type="checkbox" name="teacher" value="three" id="three" />Thrid Teacher</label>
<label for="four">
<input type="checkbox" name="teacher" value="four" id="four" />Fourth Teacher</label>
<label for="five">
<input type="checkbox" name="teacher" value="five" id="five" />Fifth Teacher</label>
</div>
<button type="submit" class="submitBtn">Submit</button>
</div>
</form>Well.. IDK if this going to make you like it? I'm making the button to add a selected teacher into Array[] call "teachers" then remove selected teacher from options. I hope you can figure the rest?
Here's my example: https://onecompiler.com/html/3xg4q9e3p