jQuery Strip Harmful Characters from String

<p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/174093127731800.jpg" class="lazy" alt="jQuery Strip Harmful Characters from String "></p> <p> Use the jQuery function to filter all potentially harmful characters in the input field. This is useful for filtering requests sent to the server before using operations such as AJAX, and adding security measures. See also: 10 jQuery security plugins </p> <pre class="brush:php;toolbar:false">/** * 过滤输入字段中所有潜在有害字符 * @param {String} str * @returns {String} */ filterInputText = function(str) { try { return str.replace(/\s+/gm, ' ').match(/[a-zA-Z0-9(),. !/:%@&?+_=-$]+/gm).join(''); } catch (e) { return ''; } };</pre> <h2>FAQ for jQuery and string manipulation (FAQ)</h2> <h3>Why use jQuery to filter harmful characters from strings? </h3> <p>jQuery is a powerful JavaScript library that simplifies HTML document traversal, event processing, animation, and Ajax interaction, thus speeding up web development. In terms of string manipulation, jQuery can be used to filter harmful characters from strings. This is especially useful in preventing cross-site scripting (XSS) attacks, where an attacker injects malicious scripts into a web page viewed by other users. By filtering harmful characters, you can clean up user input and make your web application safer. </p> <h3>How does jQuery's .replace() function work? </h3> <p> The .replace() function in jQuery replaces a specific value specified in a string. It accepts two parameters: the value to be found and the value to be replaced. This function is case sensitive, meaning it only replaces exactly matched values. If you want to replace all occurrences of values, you need to use a regular expression with the global modifier (g). </p> <h3> Can I use jQuery to remove specific characters from a string? </h3> <p>Yes, you can use jQuery to remove specific characters from a string. This can be done using the .replace() function with regular expressions. For example, to remove all occurrences of the letter "a" from a string, you can use the following code: <code>var str = "This is a test string"; var newStr = str.replace(/a/g, "");</code> This will return the string "This is test string". </p> <h3>What common harmful characters should be filtered from strings? </h3> <p> Some common harmful characters that should be filtered from a string include script tags (<code><script></script></code>), angle brackets (<code><</code>, <code>></code>) and quotes (","'). These characters can be used to inject malicious scripts into your webpage, resulting in a cross-site scripting (XSS) attack. </p> <h3>How to use jQuery to filter all non-alphanumeric characters from a string? </h3> <p> You can use jQuery to filter all non-alphanumeric characters from a string using .replace() function with regular expressions. The following code will remove all non-alphanumeric characters from the string: <code>var str = "This is a test string!"; var newStr = str.replace(/W/g, "");</code> This will return the string "Thisteststring". </p> <h3> Can I replace multiple different characters in a string with jQuery? </h3> <p>Yes, you can replace multiple different characters in a string with jQuery. This can be achieved by linking the .replace() function together. For example, to replace all occurrences of the letters "a" and "b" with the letters "c", you can use the following code: <code>var str = "This is a test string"; var newStr = str.replace(/a/g, "c").replace(/b/g, "c");</code></p> <h3>What is the difference between .replace() and .replaceAll() in jQuery? </h3> <p> The .replace() function in jQuery replaces the first occurrence of the specified value in the string, while the .replaceAll() function replaces all occurrences of the specified value. However, if you use a regular expression with the global modifier (g) in the .replace() function, it also replaces all occurrences of values. </p> <h3> Can I use jQuery to filter harmful characters from strings in real time when the user types? </h3> <p>Yes, you can use jQuery to filter harmful characters from strings in real time as the user types. This can be done by appending the keyup event handler to the input field and filtering harmful characters using the .replace() function every time the user presses the key. </p> <h3>How to use jQuery to filter HTML tags from strings? </h3> <p> You can use jQuery to filter HTML tags from strings using .replace() function with regular expressions. The following code will remove all HTML tags from the string: <code>var str = "<code>var str = "<p>This is a test string</p>"; var newStr = str.replace(/</?[^>] (>|$)/g, "");</code>This is a test string</code></p>"; var newStr = str.replace(/</?[^>] (>|$)/g, ""); This will return the string "This is a test string". <h3> </h3> Can I use jQuery in textarea to filter harmful characters from strings? <p> </p>Yes, you can use jQuery in textarea to filter harmful characters from strings. This can be done by using the .val() function to get the value of textarea, using the .replace() function to filter harmful characters, and then using the cleaned string to set the value of textarea.

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