以编程方式选择一个选项 - 具体化 css

Question

如何以编程方式从 Materialize CSS 中的选择中选择一个选项？ 我尝试将选择的值与其第一个选项附加在一起。

任何帮助将不胜感激。

谢谢。

$('select').material_select();
$('#select_1').val($('#select_1 option:first').val());

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/css/materialize.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/js/materialize.min.js"></script>
<div class="row">
<div class="input-field col s12">
<select id="select_1" name="select_1">
<option disabled selected>Choose your option</option>
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
<option>Option 6</option>
</select>
<label for="select_1">Select 1</label>
</div>
</div>

Answer 1

你只需要再次调用material_select()。

但请记住，用于选择option的:first以<option disabled selected>Choose your option</option>为目标。

$(function(){
$('select').material_select();

var select = $('#select_1');

select.find('option:eq(2)').prop('selected', true);
select.material_select();

})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/css/materialize.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/js/materialize.min.js"></script>
<div class="row">
<div class="input-field col s12">
<select id="select_1" name="select_1">
<option disabled selected>Choose your option</option>
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
<option>Option 6</option>
</select>
<label for="select_1">Select 1</label>
</div>
</div>