jquery escape html symbols

In front-end development, we often need to display the content entered by the user on the page. However, the content entered by the user may contain HTML tags or other special characters. If these special characters are not escaped, XSS vulnerabilities (cross-site scripting attacks) may exist, causing the website to be attacked. Therefore, we need to escape user input when displaying it on the page.

jQuery is a widely used JavaScript library that provides a convenient and fast way to escape HTML symbols. Let's introduce how jQuery escapes HTML symbols.

1. $.fn.text()

$.fn.text() method can escape HTML tags into plain text and return the escaped characters string. For example, if we have the following HTML code:

<div id="content">
  <p>这是一段带有HTML标签的文本</p>
</div>

We can use the following code to escape it to plain text:

var content = $('#content').text();

In this way, the value of content is: "This is a paragraph with HTML tag text", where the HTML tag has been escaped.

2. $.fn.html()

The $.fn.html() method is similar to the $.fn.text() method, except that it returns is a string containing HTML tags. However, the $.fn.html() method does not escape HTML tags to their entity names, but displays their symbols directly on the page. Therefore, if we want to escape HTML tags, we need to escape the string returned by $.fn.html() again.

For example, if we have the following HTML code:

<div id="content">
  <p>这是一段带有HTML标签的文本</p>
</div>

We can use the following code to escape it to a string containing HTML tags:

var content = $('#content').html();
content = $('<div/>').text(content).html();

In this way, the content The value is: "

This is a piece of text with HTML tags

", where the HTML tags have been escaped to their Entity name.

3. $.fn.attr()

$.fn.attr() method is used to get or set the attribute value of an HTML element. When we set an attribute value, if the attribute value contains HTML tags or other special characters, it needs to be escaped into the entity name.

For example, if we have the following HTML code:

<input id="input" type="text">

We can use the following code to set the value attribute of the input element to a string containing the HTML tag:

var value = '<p>这是一段带有HTML标签的文本</p>';
$('#input').attr('value', $('<div/>').text(value).html());

Like this , you can correctly display the string containing the HTML tag in the input element.

To sum up, jQuery provides a variety of methods to escape HTML symbols. When doing front-end development, we should develop a good habit of escaping user input to ensure the security of the website.

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