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nodejs template replacement

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Release： 2023-05-17 10:11:36

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With the widespread application of Node.js, more and more people are paying attention to and using its template engine. Template engines are a simple and easy-to-use way to dynamically insert data into HTML, XML and other documents.

In Node.js, we can use different template engines, such as Handlebars, EJS, Jade, Pug, etc. These template engines make it easier to write dynamic content.

This article will introduce several ways to use the template engine in Node.js to replace template data, including using template files, string replacement, and functions. In each of these methods, the template engine generates the final text output based on the specified data.

Using template files

The method of using template files is the most common method. First, you need to create a template file, which contains the proportion of data that needs to be replaced. Character.

For example, we can create a file called template.html with the following content:

<!DOCTYPE html>
<html>
<head>
    <title>{{title}}</title>
</head>
<body>
    <h1>{{heading}}</h1>
    <p>{{content}}</p>
</body>
</html>

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In this template, we use two {{} } placeholders, which respectively correspond to the title, title and content part to be replaced. Next, we can load the template file in Node.js and use the template engine to replace the placeholders in it.

Using the EJS template engine, we can do this:

const fs = require('fs');
const ejs = require('ejs');

const data = {
    title: '我的博客',
    heading: '欢迎来到我的博客',
    content: '这是我第一篇博客'
};

fs.readFile('template.html', 'utf-8', (err, template) => {
    if (err) throw err;
    const output = ejs.render(template, data);
    console.log(output);
});

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In this example, we use fs.readFile to read the content of the file asynchronously and use the EJS template render method in the engine to replace placeholders in the template file. The final HTML output will be printed on the console.

String replacement

Using the string replacement method can flexibly process and modify data without loading a template file. We can simply define the template and data to be replaced in Node.js, and then use the replace method to replace the template placeholder.

For example, we define the following template string:

const template = `
<!DOCTYPE html>
<html>
<head>
    <title>{{title}}</title>
</head>
<body>
    <h1>{{heading}}</h1>
    <p>{{content}}</p>
</body>
</html>
`;

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We can use the following code to define the data object and use the string replacement method to insert the data into the template:

const data = {
    title: '我的博客',
    heading: '欢迎来到我的博客',
    content: '这是我第一篇博客'
};

const output = template.replace(/{{title}}/g, data.title)
    .replace(/{{heading}}/g, data.heading)
    .replace(/{{content}}/g, data.content);
console.log(output);

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During this process, we replaced the placeholders with regular expressions in the template string. In the final output, the placeholders have been replaced with the corresponding values in the data object.

Using functions

Using functions allows us to process data more flexibly and can dynamically generate the final output. We can define a function that accepts a data object as a parameter and returns the text output after replacing the placeholder.

For example, we can define the following function:

function generateOutput(data) {
    return `
        <!DOCTYPE html>
        <html>
        <head>
            <title>${data.title}</title>
        </head>
        <body>
            <h1>${data.heading}</h1>
            <p>${data.content}</p>
        </body>
        </html>
    `;
}

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In this example, we define a function that generates output, which accepts a data object as its parameter and inserts the data into in HTML text.

We can use the following code to call this function and pass the data object:

const data = {
    title: '我的博客',
    heading: '欢迎来到我的博客',
    content: '这是我第一篇博客'
};

const output = generateOutput(data);
console.log(output);

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In this process, we can see that the function replaces the template with a dynamically generated output instead of a static one template file or template string. This approach gives us more control over the final output, while also making it easier to handle dynamic content.

Summary

This article introduces three methods of using the template engine in Node.js to replace template data: using template files, string replacement, and functions. Different approaches are suitable for different situations and needs, but they all offer flexibility, reusability, and ease of use.

When choosing a template engine and replacement method, we need to consider how to process data, how to control the final output, and how to handle dynamic content. Using the template engine in Node.js, we can easily process and generate dynamic text output, making our web applications more flexible, scalable and easy to maintain.

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