How to get the backend of bootstrap

Use Bootstrap to obtain backend data can be completed through AJAX request. The steps are as follows: initialize the AJAX request; listen to the server response; open the request, specify the method (such as GET) and URL; send the request; parse the server response (JSON or XML); update the DOM element.

How to use Bootstrap to get backend data

Bootstrap is a popular front-end framework for creating interactive and responsive web applications. Although Bootstrap does not provide connections to the backend directly, data can be retrieved from the backend by using AJAX (Asynchronous JavaScript and XML) requests.

step:

1. Initialize the AJAX request

Initialize the AJAX request using the XMLHttpRequest object.

 <code class="javascript">const request = new XMLHttpRequest();</code>

2. Listen to the server response

Use onreadystatechange event to listen for server responses.

 <code class="javascript">request.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { // 处理服务器响应} };</code>

3. Open the request

Open an HTTP request, specifying a method (such as GET or POST) and URL.

 <code class="javascript">request.open("GET", "your-endpoint-url", true);</code>

4. Send a request

Send an AJAX request.

 <code class="javascript">request.send();</code>

5. Resolve the server response

When a response is received, parse the JSON or XML response data.

 <code class="javascript">const data = JSON.parse(request.responseText);</code>

6. Update the DOM

Update the DOM element with the data fetched from the backend.

 <code class="javascript">document.getElementById("result").innerHTML = data.message;</code>

Example:

The following example demonstrates how to use Bootstrap Modal to get and display data from the backend.

 <code class="html"><!-- Modal 内容--> <div class="modal-body"> <div id="response-message"></div> </div> <!-- 发送请求按钮--> <button type="button" class="btn btn-primary" id="submit-button">发送请求</button></code>

 <code class="javascript">const modal = new bootstrap.Modal(document.getElementById("modal")); const responseMessage = document.getElementById("response-message"); const submitButton = document.getElementById("submit-button"); submitButton.addEventListener("click", () => { // 初始化AJAX 请求const request = new XMLHttpRequest(); // 监听服务器响应request.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { // 解析服务器响应const data = JSON.parse(request.responseText); // 更新DOM responseMessage.innerHTML = data.message; // 显示Modal modal.toggle(); } }; // 打开请求request.open("GET", "your-endpoint-url", true); // 发送请求request.send(); });</code>

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