Created
August 18, 2019 19:48
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Apply HTML tags across spans of text using Javascript.
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function applyTagAt(text, start, end, startTag, endTag) { | |
var text2 = ""; | |
var counter = 0; | |
var intag = false; | |
var inescape = false; | |
var tagstarted = false; | |
for (var i = 0; i < text.length; i++) { | |
if (text.charAt(i) == '<') { | |
intag = true; | |
if (tagstarted) { | |
text2 += endTag; //End our tag | |
if (counter == end) { | |
tagstarted = false; | |
} | |
} | |
} | |
if (counter == start && intag == false && inescape == false) { | |
text2 += startTag; | |
tagstarted = true; | |
text2 += text.charAt(i); | |
} else if (counter == end && inescape == false && tagstarted == true) { | |
text2 += endTag; | |
tagstarted = false; | |
text2 += text.charAt(i); | |
} else { | |
text2 += text.charAt(i); | |
} | |
if (intag == true && text.charAt(i) == '>') { | |
intag = false; | |
if (tagstarted) { | |
text2 += startTag; | |
} | |
} else if (intag == false && text.charAt(i) == '&') { | |
inescape=true; | |
} else if (inescape == true && text.charAt(i) == ';') { | |
inescape=false; | |
counter++; | |
} else if (intag == false && inescape == false) { | |
counter++; | |
} | |
} | |
// counter can be incremented at the end | |
if (counter == end && intag == false && inescape == false && tagstarted == true) { | |
text2 += endTag; | |
} | |
//replace all instances of <startTag,endTag> (<em></em>) with empty string | |
var text3 = text2.replace(startTag+endTag, ""); | |
while (text3 != text2) { | |
text2 = text3; | |
text3 = text2.replace(startTag+endTag, ""); | |
} | |
return text2; | |
} |
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