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Escape the html string with whitelist tags
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| /* | |
| Function to escape the html with specified whitelist tags & spl chars | |
| @param htmlString string string to be escaped | |
| @param tags string comma separated tag list to be unescaped | |
| @param splChars string comma separated spl char list to be unescaped | |
| @example | |
| var exTags = 'b,p,strong, i'; | |
| var exSplChars = '?,!'; | |
| document.querySelector('#editor').innerHTML = safeHTML("<strong> Need</strong> tips? <i> Visit </i> <b> W3Schools! </b>", exTags, exSplChars); | |
| */ | |
| function safeHTML(htmlString, tags, splChars) { | |
| var exDefaults = ' , %', | |
| pattern = prepareTagsRegExpPattern() + '|' + prepareCharsRegExpString(); | |
| return escape(htmlString).replace(new RegExp(pattern, 'ig'), function(match) { return unescape(match); }); | |
| function prepareTagsRegExpPattern() { | |
| return (tags || '').split(',').map(function(tag, index, arr) { | |
| var text = ''; | |
| tag = tag.trim(); | |
| if(index === 0) { | |
| text = '%3C(' + tag + '|' + '/' + tag; | |
| }else if(index === arr.length -1) { | |
| text = tag + '|' + '/' + tag + ')%3E'; | |
| } else { | |
| text = tag + '|' + '/' + tag | |
| } | |
| return text; | |
| }).join('|'); | |
| } | |
| function prepareCharsRegExpString() { | |
| return (splChars || '').split(',').map(function(char) { return escape(char); }).join('|') + '|' + | |
| (exDefaults || '').split(',').map(function(char) { return escape(char) }).join('|') ; | |
| } | |
| } |
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