使用 Ajax 和 Flask 下载 excel
[英]download excel by using Ajax andFlask
问题描述
我正在尝试使用 Ajax 调用从 flask 下载 excel。 它显示响应代码为 200 但 excel 未下载，错误消息如下。
Ajax 请求：
$("#genExcel").on("点击", function() { var xhttp = new XMLHttpRequest();
// Data to post
var dataarray = {};
// Use XMLHttpRequest instead of Jquery $ajax
xhttp.onreadystatechange = function() {
var a;
if (xhttp.readyState === 4 && xhttp.status === 200) {
// Trick for making downloadable link
a = document.createElement('a');
const objectURL = window.URL.createObjectURL(xhttp.response);
a.href = objectURL
//const objectURL = URL.createObjectURL(object)
// Give filename you wish to download
a.download = "test-file.xlsx";
a.style.display = 'none';
document.body.appendChild(a);
a.click();
}
};
// Post data to URL which handles post request
xhttp.open("POST", '/genexcel');
xhttp.setRequestHeader("Content-Type", "application/json");
// You should set responseType as blob for binary responses
//xhttp.responseType = 'blob';
xhttp.send(JSON.stringify(dataarray));
});
Flask function：
@app.route('/genexcel', methods=["GET", "POST"])
def createExcel():
if request.method == 'POST':
data = request.json
# process json data
return send_file(strIO, attachment_filename='test.xlsx', as_attachment=True)
错误：
1 [仅报告] 拒绝将字符串评估为 JavaScript，因为“unsafe-eval”不是以下内容安全策略指令中允许的脚本源：“script-src * blob:”。
2 未捕获的类型错误：无法在“URL”上执行“createObjectURL”：未找到与提供的签名匹配的 function。
at XMLHttpRequest.xhttp.onreadystatechange
2 个解决方案
解决方案1
1 已采纳 2020-06-17 11:49:42
希望我对您的理解正确。 这是一个使用您提供的数据数组的非常简单的示例。 您可以修改以满足您的需求：
Flask 功能
from flask import Flask, render_template, request, url_for, send_file
import xlsxwriter
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
@app.route('/genexcel', methods=["GET", "POST"])
def createExcel():
if request.method == 'POST':
data = request.get_json(force=True)
# process json data
createExcel(data['data'])
file_path = 'static/files/test.xlsx'
return send_file(file_path, attachment_filename='test.xlsx', as_attachment=True)
def createExcel(data):
workbook = xlsxwriter.Workbook('static/files/test.xlsx')
worksheet = workbook.add_worksheet()
row_no = 0
col_no = 0
for row in data:
col_no = 0
for entry in row:
worksheet.write(row_no, col_no, entry)
col_no += 1
row_no += 1
workbook.close()
app.run(debug=True, port=5010)
索引.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Test</title>
</head>
<body>
Testing
<button id="genExcel">Direct Download</button>
<button id="genExcelFlask">Flask Download</button>
</body>
<script>
var btn = document.getElementById("genExcel");
var btnFlask = document.getElementById("genExcelFlask");
var dataArray = {
data: [
[1, "A", 100],
[2, "B", 200],
],
};
btn.addEventListener("click", (e) => {
fetch("https://jsonplaceholder.typicode.com/todos/1")
.then((resp) => resp.blob())
.then((blob) => {
const url = window.URL.createObjectURL(blob);
const a = document.createElement("a");
a.style.display = "none";
a.href = url;
// the filename you want
a.download = "todo-1.json";
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
alert("your file has downloaded!"); // or you know, something with better UX...
})
.catch(() => alert("oh no!"));
});
btnFlask.addEventListener("click", (e) => {
console.log(JSON.stringify(dataArray));
fetch("{{ url_for('createExcel') }}", {
method: "post",
body: JSON.stringify(dataArray),
})
.then((resp) => resp.blob())
.then((blob) => {
const url = window.URL.createObjectURL(blob);
const a = document.createElement("a");
a.style.display = "none";
a.href = url;
// the filename you want
a.download = "test.xlsx";
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
alert("your file has downloaded!"); // or you know, something with better UX...
})
.catch(() => alert("oh no!"));
});
</script>
</html>
解决方案2
0 2020-06-16 11:14:32
这是一个使用提取 API 的示例。 第一个按钮只是直接下载 JS。 第二个按钮使用 Flask 路由进行下载。 希望能帮助到你。
索引.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Test</title>
</head>
<body>
Testing
<button id="genExcel">Direct Download</button>
<button id="genExcelFlask">Flask Download</button>
</body>
<script>
var btn = document.getElementById("genExcel");
var btnFlask = document.getElementById("genExcelFlask");
btn.addEventListener("click", (e) => {
fetch("https://jsonplaceholder.typicode.com/todos/1")
.then((resp) => resp.blob())
.then((blob) => {
const url = window.URL.createObjectURL(blob);
const a = document.createElement("a");
a.style.display = "none";
a.href = url;
// the filename you want
a.download = "todo-1.json";
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
alert("your file has downloaded!"); // or you know, something with better UX...
})
.catch(() => alert("oh no!"));
});
btnFlask.addEventListener("click", (e) => {
fetch("{{ url_for('createExcel') }}")
.then((resp) => resp.blob())
.then((blob) => {
const url = window.URL.createObjectURL(blob);
const a = document.createElement("a");
a.style.display = "none";
a.href = url;
// the filename you want
a.download = "test.xlsx";
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
alert("your file has downloaded!"); // or you know, something with better UX...
})
.catch(() => alert("oh no!"));
});
</script>
</html>
Flask Function
from flask import Flask, render_template, request, url_for, send_file
@app.route('/genexcel', methods=["GET", "POST"])
def createExcel():
if request.method == 'POST':
data = request.json
print(data)
# process json data
file_path = 'static/files/test.xlsx'
return send_file(file_path, attachment_filename='test.xlsx', as_attachment=True)
无法使用Ajax jQuery下载Excel文件
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