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[javascript]textarea内の文字をタグで囲む

Last updated at Posted at 2017-10-16

textarea内の文字をタグで囲む

仕様

  • 任意のtextareaに対して文字を選択して適当なタグで囲む

ソース

HTML

test_3.html
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript" src="test_3.js"></script>
<title>test_3:textareaの文字をタグで囲む</title>
</head>
<body>
<textarea type="text" id="hoge" rows=10>
aaabbb
cccddd
eeefff
</textarea><br>
<input type="button" value="h1" class="tag">
<input type="button" value="h2" class="tag">
<input type="button" value="h3" class="tag">
</body>
</html>

javascript

test_3.js
$(function(){
  $('.tag').on('click',function(e){
    var v= $('#hoge').val();
    var selin = $('#hoge').prop('selectionStart');
    var selout = $('#hoge').prop('selectionEnd');
    var befStr="<"+$(this).val()+">";
    var aftStr="</"+$(this).val()+">";
    var v1=v.substr(0,selin);
    var v2=v.substr(selin,selout-selin);
    var v3=v.substr(selout);
    $('#hoge')
      .val(v1+befStr+v2+aftStr+v3)
      .prop({
        "selectionStart":selin+befStr.length,
        "selectionEnd":selin+befStr.length+v2.length
        })
      .trigger("focus");
  });
});
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