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Strip HTML tags in Rails, JavaScript and PHP In this HTML JavaScript tutorial, Brijesh Shah guides you create some simple codes in Rails, JavaScript and PHP to strip HTML tags, strip tag PHP. Very simple and useful codes to try, you should check them. You can check our JavaScript Strip HTML Tags script.


Strip tag function is used to remove html tags from the string.

Here I will show you that how to use strip tag in ruby on rails, javascript and php.

#PHP:

Example 1: Remove all html tags.

1.<?php
2.$str '<h1>Test1.</h1><p> text2</p>';
3.echo strip_tags($str);
4.?>

Example 2: Allow p and h1 html tag.

1.<?php
2.$str '<h1>Test1.</h1><p> text2</p>';
3.echo strip_tags($str,"<h1><p>");
4.?>

#Ruby On Rails

Example 1: Remove all html tags

#model

01.class User < ActiveRecord::Base
02.include ActionView::Helpers
03.before_save :strip_comment
04.def strip_comment
05.return true if self.comment.nil?
06.self.comment=sanitize(self.comment,:tags =>%w())
07.save
08.return true
09.end

Example 2: Allow h1 and p html tags

#model

01.class User < ActiveRecord::Base
02.include ActionView::Helpers
03.before_save :strip_comment
04. 
05.def strip_comment
06.return true if self.comment.nil?
07.self.comment=sanitize(self.comment,:tags =>%w(p h1))
08.save
09.return true
10.end

#Javascript
#Add strip_tags.js

01.function strip_tags (str, allowed_tags) {
02. 
03.var key = '', allowed = false;
04.var matches = [];
05.var allowed_array = [];
06.var allowed_tag = '';
07.var i = 0;
08.var k = '';
09.var html = '';</pre>
10.var replacer = function (search, replace, str) {
11.return str.split(search).join(replace);
12.};
13. 
14.// Build allowes tags associative array
15.if (allowed_tags) {
16.allowed_array = allowed_tags.match(/([a-zA-Z0-9]+)/gi);
17.}
18. 
19.str += '';
20. 
21.// Match tags
22.matches = str.match(/(<\/?[\S][^>]*>)/gi);
23. 
24.// Go through all HTML tags
25.for (key in matches) {
26.if (isNaN(key)) {
27.// IE7 Hack
28.continue;
29.}
30. 
31.// Save HTML tag
32.html = matches[key].toString();
33. 
34.// Is tag not in allowed list? Remove from str!
35.allowed = false;
36. 
37.// Go through all allowed tags
38.for (k in allowed_array) {
39.// Init
40.allowed_tag = allowed_array[k];
41.i = -1;
42. 
43.if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+'>');}
44.if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+' ');}
45.if (i != 0) { i = html.toLowerCase().indexOf('</'+allowed_tag)   ;}
46. 
47.// Determine
48.if (i == 0) {
49.allowed = true;
50.break;
51.}
52.}
53. 
54.if (!allowed) {
55.str = replacer(html, "", str); // Custom replace. No regexing
56.}
57.}
58. 
59.return str;
60. 
61.}

#Used strip_tags function to remove html tags.
Example 1: remove all html tags.

1.var html_string= '<h1>Test1.</h1><p> text2</p>';
2.var strip_string= strip_tags(html_string);

Example 2: allow only p and h1 html tags

1.var html_string= '<h1>Test1.</h1><p> text2</p>';
2.var strip_string= strip_tags(html_string,"<p><h1>");

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