September 5, 2020
Category : Javascript
jQuery
HTML tags are not allowed in textbox validation using Jquery
I have two example that prevent HTML tags are not allowed in textbox using focusout event of jquery. You can chose any if you think it is best for me. In the first example i use regular expression for prevent html tags in my textarea and in second example i user directly check with html tags. So you can check both and use
Example 1:
<html lang="en">
<head>
<title>Jquery - HTML Tag are not allowed in textarea</title>
<script type="text/javascript" src="//cdn.jsdelivr.net/jquery/1/jquery.min.js"></script>
</head>
<body>
<div class="container text-center">
<form>
<textarea class="box"></textarea>
<button>Submit</button>
</form>
<script>
$(".box").focusout( function(e) {
var reg =/<(.|\n)*?>/g;
if (reg.test($('.box').val()) == true) {
alert('HTML Tag are not allowed');
}
e.preventDefault();
});
</script>
</div>
</body>
</html>
Example 2:
<html lang="en">
<head>
<title>Jquery - HTML Tag are not allowed in textarea</title>
<script type="text/javascript" src="//cdn.jsdelivr.net/jquery/1/jquery.min.js"></script>
</head>
<body>
<div class="container text-center">
<form>
<textarea class="box"></textarea>
<button>Submit</button>
</form>
<script>
jQuery('.box').focusout(function(e){
var message = jQuery('.box').val();
if(/<(br|basefont|hr|input|source|frame|param|area|meta|!--|col|link|option|base|img|wbr|!DOCTYPE|a|abbr|acronym|address|applet|article|aside|audio|b|bdi|bdo|big|blockquote|body|button|canvas|caption|center|cite|code|colgroup|command|datalist|dd|del|details|dfn|dialog|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frameset|head|header|hgroup|h1|h2|h3|h4|h5|h6|html|i|iframe|ins|kbd|keygen|label|legend|li|map|mark|menu|meter|nav|noframes|noscript|object|ol|optgroup|output|p|pre|progress|q|rp|rt|ruby|s|samp|script|section|select|small|span|strike|strong|style|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video).*?>|<(video).*?<\/\2>/i.test(message) == true) {
alert('HTML Tag are not allowed');
e.preventDefault();
}
});
</script>
</div>
</body>
</html>
Hardik Savani
I'm a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.
