The key to dynamically generating HTML content is to use JavaScript to manipulate the DOM. The main methods include: 1. Use innerHTML to directly insert HTML strings, which are suitable for simple scenarios but need to pay attention to security issues; 2. Create and add elements through createElement and append, which has a clearer structure and is easy to expand; 3. Update content dynamically based on user interaction, such as listening to input events to achieve immediate feedback; 4. Use template strings to improve code readability and maintenance. At the same time, we need to pay attention to XSS protection and performance optimization to ensure that dynamic page updates are safe and efficient.
In web development, dynamically updating content is a basic requirement of modern websites. JavaScript is the core tool for achieving this. It can not only respond to user actions, but also modify page content in real time without reloading the entire page. The key behind this is to implement the generation of dynamic HTML content through JavaScript operation DOM (document object model).
Update content using innerHTML
innerHTML is the most direct way to modify HTML content. You can use it to insert an HTML string into the specified element.
For example, suppose you have an empty <div> : <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373323518008.jpeg" class="lazy" alt="Generating Dynamic HTML Content with JavaScript"><pre class='brush:php;toolbar:false;'> <div id="content"></div></pre><p> You can dynamically insert content through JavaScript:</p><pre class='brush:php;toolbar:false;'> document.getElementById("content").innerHTML = "<p>This is what is added dynamically.</p>";</pre><p> This method is simple and direct, but it should be noted: if the content you insert comes from user input or external data sources, be sure to clean or escape first to prevent XSS (cross-site scripting attacks). </p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373323384763.jpeg" class="lazy" alt="Generating Dynamic HTML Content with JavaScript" /><hr /><h3 id="Add-elements-using-createElement-and-append"> Add elements using createElement and append</h3><p> Compared to <code>innerHTML , using createElement and append is safer and more suitable for building complex structures.
For example, you want to dynamically add a <li> with text to <ul> :
<ul id="list"></ul>
Corresponding JavaScript:
const newItem = document.createElement("li");
newItem.textContent = "Dynamicly added list item";
document.getElementById("list").append(newItem);The advantage of this approach is that it is clear structure and easier to add event listeners or other attributes. If you want to add multiple elements, you can use a loop to process the data:
<ul><li> Create elements<li> Set content or properties<li> Insert into the target containerGenerate content dynamically based on user interaction
User operations (such as clicking buttons and entering text) are common ways to trigger content updates. For example, a search box dynamically displays a list of suggestions when entering.
You can listen to the input event of the input box and then generate HTML based on the input content:
<input type="text" id="search" placeholder="enter keyword"> <div id="suggestions"></div>
document.getElementById("search").addEventListener("input", function () {
const query = this.value.toLowerCase();
const suggestions = ["apple", "banana", "orange", "grape"].filter(item =>
item.includes(query)
);
document.getElementById("suggestions").innerHTML = suggestions
.map(item => `<div>${item}</div>`).join("");
});This method allows users to get instant feedback and improve the experience. But pay attention to performance, such as anti-shake treatment, to avoid frequent triggers that affect page fluency.
Improve readability with template strings
When the content you want to insert is more complicated, using template literals can make the code clearer.
for example:
const user = { name: "Alice", age: 25 };
const html = `
<div class="user-card">
<h3>${user.name}</h3>
<p>Age: ${user.age}</p>
</div>
`;
document.getElementById("user").innerHTML = html;Template strings not only support multiple lines of text, but also directly embed variables and expressions, making them ideal for generating dynamic HTML content.
Basically that's it. The key to dynamically generate HTML with JavaScript is to master the methods of DOM operations while paying attention to security and performance. The method is not complicated, but the details are easy to ignore.
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