CODEWITHSUNDEEP
javascript
Adam
Adam

Reputation: 3665

Javascript Error when using regexp - Object doesn't support this property or method

So I am going through this book and copied the code word for word to be hands on with it and I am getting "Object doesn't support this property or method".

var text = '<html><body bgcolor=blue><p>' + '<This is <b>BOLD<\/b>!<\/p><\/body><\/html>';

var tags = /[^<>]+|<(\/?)([A-Za-z]+)([^<>]*)>/g;

var a,i;

String.method('entityify', function () {
var character = {
    '<': '&lt;',
    '>': '&gt;',
    '&': '&amp;',
    '"': '&quot;'
};

return function() {
    return this.replace( /[<>&"]/g , function(c) {
        return character[c];
    });
};
}());

while((a = tags.exec(text))) {
for (i = 0; i < a.length; i += 1) {
    document.writeln(('// [' + i + '] ' + a[i]).entityify());
}
document.writeln();
}

//Output [0] <html>
//Output [1] 
//Output [2] html
//Output [3] 
//and so on through the loop.

I can't seem to make their example work.

**Edit - I found and added the function but still not quite working.

Upvotes: 0

Views: 801

Answers (1)

maerics
maerics

Reputation: 156434

The problem is that there is no String.method(...) function. If you're trying to add a new function to the String type then try this:

String.prototype.entityify = (function () {
  var character = {
    '<':'&lt;',  '>':'&gt;',  '&':'&amp;',  '"':'&quot;'
  };
  return function() {
    return this.replace( /[<>&"]/g , function(c) {
      return character[c];
    });
  };
})();

'<foo & bar>'.entityify(); // => "&lt;foo &amp; bar&gt;"

Although, if you plan to make this part of a library then you should not assign to the String.prototype directly, instead use Object.defineProperty(...) as illustrated here.

Upvotes: 1

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