如何在不删除值的情况下在选项文本上添加文本？

Question

我在尝试添加一些文本而不更改选项选择值时遇到问题。

你能帮我解决这个问题吗？

我有这个HTML代码

<select id="q_c_0_a_0_name">
 <option value="name">     Name</option>
 <option value="lastanem1">First Lastname</option>
 <option value="lastname2">Second Lastname</option>
 ...
 <option value="xxxxxxxxx">Other value</option>
</select>

我正在尝试在不删除值的情况下向文本选项添加文本。

<select id="q_c_0_a_0_name">
 <option value="name">     Filter by Name</option>
 <option value="lastanem1">Filter by First Lastname</option>
 <option value="lastname2">Filter by Second Lastname</option>
 ...
 <option value="xxxxxxxxx">Filter by Other value</option>
</select>

我试过这个 Jquery 代码：

$(function(){
  $("#q_c_0_a_0_name option[value=cont]").textContent  += "Filter by";
});

也尝试了这个 Jquery 代码：

$(function(){
  $("#q_c_0_a_0_name option[value]").textContent  += "Filter by";
});

Answer 1

使用text()

$("#q_c_0_a_0_name option").text(function() {
  return "Filter by " + $(this).text()
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<select id="q_c_0_a_0_name">
  <option value="name"> Name</option>
  <option value="lastanem1">First Lastname</option>
  <option value="lastname2">Second Lastname</option>
  <option value="xxxxxxxxx">Other value</option>
</select>

Answer 2

<select id="q_c_0_a_0_name">
    <option value="name">Name</option>
    <option value="lastanem1">First Lastname</option>
    <option value="lastname2">Second Lastname</option>
    <option value="xxxxxxxxx">Other value</option>
</select>

<script>
    $('#q_c_0_a_0_name').find($('option').prepend('Filter By '));
</script>

如何在不删除值的情况下在选项文本上添加文本？

How can i add text on option text without remove values?

javascript

jquery

html

select

option