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Alt attribute encoding with JavaScript

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深忆病人
深忆病人 2020-12-03 22:07

Html entities must be encoded in alt attribute of an image in HTML page. So

\"A
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4条回答
  • 忘掉有多难
    2020-12-03 22:43 
    <!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Decode HTML entities using JavaScript</title>
  </head>
  <body>
    <img id="formula" src="vote-arrow-up-on.png" alt="A &rarr; C">
    <script>
      function html_entity_decode(str) {
        var p = document.createElement("p");
        p.innerHTML = str.replace(/</g,"&lt;").replace(/>/g,"&gt;");
        return p.innerHTML;
      }

      var theValue = html_entity_decode('A &rarr; B');
      document.getElementById('formula').title = theValue;
    </script>
  </body>
</html>

    Credits to The JavaScript Source.

    EDIT: I changed the original code to only use innerHTML on a <p> element, instead of innerHTML and value of a <textarea>.

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  • 挽巷
    2020-12-03 22:46

    Here's an alternative if you can't save your file using a Unicode format:

    function decodeHTML(str) {
    return str.replace(/&#(\d+);?/g, function() {
        return String.fromCharCode(arguments[1])
    });
}

    However, this requires you to use the numeric representation. In this case &#8594;.

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  • 时光取名叫无心
    2020-12-03 22:57

    JavaScript has its own system for escaping special characters in strings:

    document.getElementById('formula').alt = 'A \u2192 B';
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  • 孤街浪徒
    2020-12-03 22:58

    In that particular case, you don't have encode special HTML characters in JavaScript.

    The W3C validator should not complain about this (just tested it) and the document should validate. If not post your code and I'll update my answer.

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