Hi i have problem with un-registering/unbinding material components
Note: in my real project i'm calling initializeMaterialComponents once data is loaded dynamically every time
Question: i need to un-registering/unbind previous event so that it is not triggered 3 times (+) provide better solution
Below is my problem selection triggered 3 times:
function initializeMaterialComponents(){
// console.log(mdc);
var selectBox = new mdc.select.MDCSelect(document.querySelector('.mdc-select'));
selectBox.listen('MDCSelect:change', () => {
alert(`Selected option at index ${selectBox.selectedIndex} with value "${selectBox.value}"`);
});
}
initializeMaterialComponents();
initializeMaterialComponents();
initializeMaterialComponents();<head>
<link href="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.css" rel="stylesheet">
<script src="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.js"></script>
</head>
<div class="mdc-select mdc-select--filled demo-width-class">
<div class="mdc-select__anchor"
role="button"
aria-haspopup="listbox"
aria-expanded="false"
aria-labelledby="demo-label demo-selected-text">
<span class="mdc-select__ripple"></span>
<span id="demo-label" class="mdc-floating-label">Pick a Food Group</span>
<span class="mdc-select__selected-text-container">
<span id="demo-selected-text" class="mdc-select__selected-text"></span>
</span>
<span class="mdc-select__dropdown-icon">
<svg
class="mdc-select__dropdown-icon-graphic"
viewBox="7 10 10 5" focusable="false">
<polygon
class="mdc-select__dropdown-icon-inactive"
stroke="none"
fill-rule="evenodd"
points="7 10 12 15 17 10">
</polygon>
<polygon
class="mdc-select__dropdown-icon-active"
stroke="none"
fill-rule="evenodd"
points="7 15 12 10 17 15">
</polygon>
</svg>
</span>
<span class="mdc-line-ripple"></span>
</div>
<div class="mdc-select__menu mdc-menu mdc-menu-surface mdc-menu-surface--fullwidth">
<ul class="mdc-list" role="listbox" aria-label="Food picker listbox">
<li class="mdc-list-item mdc-list-item--selected" aria-selected="true" data-value="" role="option">
<span class="mdc-list-item__ripple"></span>
</li>
<li class="mdc-list-item" aria-selected="false" data-value="grains" role="option">
<span class="mdc-list-item__ripple"></span>
<span class="mdc-list-item__text">
Bread, Cereal, Rice, and Pasta
</span>
</li>
<li class="mdc-list-item mdc-list-item--disabled" aria-selected="false" data-value="vegetables" aria-disabled="true" role="option">
<span class="mdc-list-item__ripple"></span>
<span class="mdc-list-item__text">
Vegetables
</span>
</li>
<li class="mdc-list-item" aria-selected="false" data-value="fruit" role="option">
<span class="mdc-list-item__ripple"></span>
<span class="mdc-list-item__text">
Fruit
</span>
</li>
</ul>
</div>
</div>Below is jquery example with 3 calls, but works perfectly
function attachEventListernerToSelectbox(){
$('#select').off('change');
$('#select').on('change',function(){
alert('selected value is :'+ $(this).val());
});
}
$(function(){
attachEventListernerToSelectbox();
attachEventListernerToSelectbox();
attachEventListernerToSelectbox();
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="select">
<option value="---">--select--</option>
<option value="Banana">Banana</option>
<option value="Apple">Apple</option>
<option value="Kiwi">Kiwi</option>
</select>from How to un-register/unbind a event in material ui with javascript
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