I want a checkbox to be checked by default,

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How can I set the default value for an HTML <select> element? 18 answers

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请试试这个

<select name="semester">
            <option value="">Select Semester</option>
            <option value="1" <?php if($data['semester']==1){echo 'selected';}?>>Semester 1</option>
            <option value="2" <?php if($data['semester']==2){echo 'selected';}?>>Semester 2</option>
            <option value="3" <?php if($data['semester']==3){echo 'selected';}?>>Semester 3</option>
</select>

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您可以使用selected属性。

<select name="semester">
     <option value="">Select Semester</option>
     <option value="1" selected="selected">Semester 1</option>
     <option value="2">Semester 2</option>
     <option value="3">Semester 3</option>
</select>

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If you want to select semester 2 so here you go:

HTML:

<select name="semester">
  <option value="">Select Semester</option>
  <option value="1">Semester 1</option>
  <option value="2" selected>Semester 2</option>
  <option value="3">Semester 3</option>
</select>

Jquery:

$("select option").each(function(){
  if ($(this).text() == "Semester 2")
    $(this).attr("selected","selected");
});

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