Can someone help me with this issue? I need to change the tags in a given string from <h2> to <h3>. For example, turning
<h2>Test</h2><p>test</p><h3>Test</h3><p>test</p>Can someone help me with this issue? I need to change the tags in a given string from <h2> to <h3>. For example, turning
<h2>Test</h2><p>test</p><h3>Test</h3><p>test</p>Here's a neat trick using regular expressions to make the replacement:
const example = "<h2>Sample</h2><p>content</p>";
example.replace(/<(\/?)h2>/g, "<$1h3>") // <h3>Sample</h3><p>content</p>
To simplify the process, using a regular expression/regex is recommended.
https://regex101.com/r/h3oqia/1
const regex = /\<h2\>(.*)\<\/h2\>/g;
// Any tag can be used here, h2 is just an example.
let str = "<h2>Test</h2><p>test</p>";
console.log(str);
str = str.replace(regex, "<h3>$1</h3>");
console.log(str);This method may not work perfectly for nested tags but it functions well for the provided scenario. Handling nested tags would require more time and complexity.
Utilize the Document Object Model (DOM):
const newElement = document.createElement('div');
newElement.innerHTML = '<h2>Example</h2><p>example text</p>';
const oldHeader = newElement.getElementsByTagName('h2')[0];
const newHeader = document.createElement('h3');
Array.from(oldHeader.childNodes).forEach(function(child) {
newHeader.appendChild(child);
});
newElement.replaceChild(newHeader, oldHeader);
alert(newElement.innerHTML);
It seems like you are attempting to achieve the following:
var str = "<h2>Test</h2><p>test</p>";
var str = str.replace(/\d+/g, function(number) {
return Number(number) + 1;
});
console.log(str)Explanation:
var str = str.replace(/\d+/g, function(number) {
return Number(number) + 1;
});
This code snippet loops through the string, replacing each integer with the next number.
To learn more about the Javascript .replace method used here, check out this link:
To learn more about the RegExp g modifier as demonstrated above, visit:
Try out this alternate method similar to Marat's, utilizing DOMParser instead of the main document. The function presented here will iterate through the attributes on the original nodes and transfer them to the new ones. Keep in mind that functionalities like event listeners won't be operational using this technique, although they can't be added to a string directly anyway.
This particular approach is more versatile and can handle even complex html strings, which explains why relying on a DOM parser proves to be superior to utilizing regex, despite the seeming simplicity of the regex methodology.
const str = '<h2>Test</h2><p>test</p>';
function replaceBySelector(str, selector, newTag, single = false) {
const domparser = new DOMParser();
const doc = domparser.parseFromString( str, 'text/html');
const elements = single ? [doc.querySelector(selector)] : doc.querySelectorAll(selector);
for (const element of elements) {
const replacement = doc.createElement(newTag);
for (const attribute of element.attributes) {
replacement.setAttribute(attribute.nodeName, attribute.nodeValue);
}
replacement.innerHTML = element.innerHTML;
element.parentNode.replaceChild(replacement, element)
}
return doc.body.innerHTML;
}
console.log(replaceBySelector(str, 'h2', 'h3'));
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