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.
<?php
$str '<h1>Test1.</h1><p> text2</p>';
echo strip_tags($str);
?>
Example 2: Allow p and h1 html tag.
<?php
$str '<h1>Test1.</h1><p> text2</p>';
echo strip_tags($str,"<h1><p>");
?>
#Ruby On Rails
Example 1: Remove all html tags
#model
class User < ActiveRecord::Base
include ActionView::Helpers
before_save :strip_comment
def strip_comment
return true if self.comment.nil?
self.comment=sanitize(self.comment,:tags =>%w())
save
return true
end
Example 2: Allow h1 and p html tags
#model
class User < ActiveRecord::Base
include ActionView::Helpers
before_save :strip_comment
def strip_comment
return true if self.comment.nil?
self.comment=sanitize(self.comment,:tags =>%w(p h1))
save
return true
end
#Javascript
#Add strip_tags.js
function strip_tags (str, allowed_tags) {
var key = '', allowed = false;
var matches = [];
var allowed_array = [];
var allowed_tag = '';
var i = 0;
var k = '';
var html = '';
var replacer = function (search, replace, str) {
return str.split(search).join(replace);
};
// Build allowes tags associative array
if (allowed_tags) {
allowed_array = allowed_tags.match(/([a-zA-Z0-9]+)/gi);
}
str += '';
// Match tags
matches = str.match(/(<\/?[\S][^>]*>)/gi);
// Go through all HTML tags
for (key in matches) {
if (isNaN(key)) {
// IE7 Hack
continue;
}
// Save HTML tag
html = matches[key].toString();
// Is tag not in allowed list? Remove from str!
allowed = false;
// Go through all allowed tags
for (k in allowed_array) {
// Init
allowed_tag = allowed_array[k];
i = -1;
if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+'>');}
if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+' ');}
if (i != 0) { i = html.toLowerCase().indexOf('</'+allowed_tag) ;}
// Determine
if (i == 0) {
allowed = true;
break;
}
}
if (!allowed) {
str = replacer(html, "", str); // Custom replace. No regexing
}
}
return str;
}
#Used strip_tags function to remove html tags.
Example 1: remove all html tags.
var html_string= '<h1>Test1.</h1><p> text2</p>';
var strip_string= strip_tags(html_string);
Example 2: allow only p and h1 html tags
var html_string= '<h1>Test1.</h1><p> text2</p>';
var strip_string= strip_tags(html_string,"<p><h1>");
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