Detailed explanation of JavaScript string replacement method and FAQ

This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages.

Replace string inside JavaScript code

The most direct way is to use replace() method:

 str = str.replace("find","replace");

This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g :

 str = str.replace(/find/g, "replace");

Replace string inside web page HTML

Using jQuery:

 $("#text").val( $("#text").val().replace('.', ':') );

This code takes the value of the text box, replaces the . in it as : , and then updates the value of the text box.

Using JavaScript:

 var elmOperator = document.getElementById(elm.id.replace('Include', 'Operator'));

This code replaces the string from the element ID.

Other alternative methods

.replaceWith( newContent ) method

Using jQuery:

 $('.third').replaceWith($('.first'));

This method .third the element selected by the .first selector.

Using JavaScript:

 var str = "Visit BLOGOOLA!";
document.write(str.replace("BLOGOOLA", "JQUERY4U"));

This method replaces the string directly in JavaScript code.

Replace the value of the form selection

 //For input element $('input:text.items').val(function(index, value) {
  return value ' ' this.className;
});

This code adds its class name after the value of each matching input box.

Replace foreign characters in HTML

 var temp = new String('This fori<gn chars="" st="" test=""> ring... So?????');
document.write(temp '<br> ');
temp = temp.replace(/[^a-zA-Z 0-9] /g,'');
document.write(temp '<br> ');</gn>

This code uses regular expressions to remove non-alphanumeric characters in the string.

Reference: http://m.miracleart.cn/link/7a4d21f40402d068ec5369232b395901

JavaScript String Replacement FAQ

How to replace all occurrences of strings in JavaScript?

The replace() method only replaces the first match by default. Use regular expressions and global flags g to replace all matches.

Can I change the characters at a specific index using replace() method?

The replace() method cannot directly replace characters at a specific index. You need to convert the string into a character array, modify the array elements, and then convert the array back to a string.

How to use replace() method with function?

The second parameter of the replace() method can be a function. The function is called after a match, and its return value is used as a replacement string.

How to delete characters in a string using replace() method?

Replace the character you want to delete with an empty string.

How to replace multiple different strings at once?

Just call replace() method in a chain.

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