jquery ajax popup error

jQuery Ajax is a browser-side JS plug-in that allows developers to easily use Ajax technology in web pages. When we use jQuery Ajax, we often encounter some errors, such as the server cannot respond, the request times out, or the returned data format is incorrect, etc. When these errors occur, we usually want to be able to pop up error prompts so that users can get timely feedback. Here's how to use jQuery Ajax to pop up errors.

Step one: Set the parameters of the Ajax request

When using jQuery Ajax, we can set a parameter object similar to config. In this parameter object, there is a very important attribute called error. After setting the error attribute, if the Ajax request fails or there is an error in the backend server, the error function will be called.

For example, we can define an error function in the parameter object of the Ajax request, as shown below:

$.ajax({
  url: "http://example.com",
  type: "get",
  dataType: "json",
  success: function(data) {
    // 请求成功，处理返回的数据
  },
  error: function(error) {
    // 请求出错，处理错误信息
  }
})

The error function here will be called when the Ajax request fails or the background server fails. When the error function is called, it passes an error parameter as the function's parameter. The error parameter is an object that contains the request's failure reason, status code, response content and other information.

Step 2: Pop up the corresponding error prompt box based on the error message

In the error function, we can determine the error type based on the content of the error parameter and pop up the corresponding error prompt box. For example, we can use the Dialog component in jQuery UI to implement an error prompt box. The code is as follows:

error: function(error) {
  var errorType = "";
  if(error.status == 404) {
    errorType = "未找到请求的页面";
  } else if(error.status == 500) {
    errorType = "服务器出错，请联系管理员";
  } else {
    errorType = "请求出错，请重试";
  }

  // 弹出错误提示框
  $("<div>发生了如下错误：" + errorType + "</div>").dialog({
    modal: true,
    title: "错误提示",
    buttons: {
      "确定": function() {
        $(this).dialog("close");
      }
    }
  });
}

In this example, we determine the error type based on the status attribute in error. If it is 404 , the requested page was not found; if it is 500, it means a server error; otherwise, a request error occurred. Then, use the Dialog component in jQuery UI to pop up an error prompt box with the title "Error Prompt", the content as the error type, and the confirmation button as "OK".

Step 3: Beautify the style

In order to make the error prompt box more beautiful, we can beautify it. For example, we can add some CSS properties, such as background color, font size, border width, etc., to beautify the error prompt box. The code is as follows:

.ui-dialog-titlebar-close {
  visibility: hidden;
}

.ui-dialog {
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-shadow: 0 0 5px #ccc;
}

.ui-dialog-titlebar {
  background-color: #eee;
  border-radius: 5px 5px 0 0;
  border-bottom: 1px solid #ccc;
  padding: 10px;
}

.ui-dialog-title {
  font-size: 18px;
  font-weight: bold;
  color: #333;
}

.ui-dialog-content {
  padding: 10px;
  font-size: 16px;
}

In the above CSS code, we have styled different elements of the Dialog component, such as the visibility of the close button, the background color of the Dialog, the border width, etc. In this way, we can beautify the error message box and make it look more comfortable and friendly.

Summary

When using jQuery Ajax, we need to notice the request failure and pop up the corresponding error prompt box in time to let the user know the status of the request. By setting the error function in the Ajax parameters, we can obtain the corresponding error information when the request fails, and pop up the corresponding error prompt box for different error types. In order to make the error prompt box more beautiful and friendly, we can beautify it.

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