[英]How to debug JavaScript script in cshtml ASP.NET core ( by using Chrome browser or in Visual Studio 2019)?
[英]How to get data from api using visual studio 2019 and javascript?
我想從 api 獲取一些數據並使用 java 腳本顯示在警報框中,但是我有一個錯誤並且無法顯示數據。
錯誤是:
我的代碼:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src https://*; child-src 'none';">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
</head>
<body>
<script defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCLLN5Uon6l2A41J2N0whRM7WQ9YAmRFeQ&callback=initMap">
</script>
<script type="text/javascript">
var markers = [
{ "title": 'Населено място', "lat": '41.19197', "lng": '25.33719', "description": 'Информация за населеното място' }
];
window.onload = function () {
LoadMap();
DrawChart();
}
function LoadMap() {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 7,
minZoom: 7.5,
maxZoom: 10,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var infoWindow = new google.maps.InfoWindow();
var latlngbounds = new google.maps.LatLngBounds();
var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
for (var i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title,
icon: 'http://192.168.0.1/markers/marker.png',
opacity: 0.4
});
(function (marker, data) {
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent("<div style = 'width:300px;min-height:100px'>" + data.description + "</div>");
infoWindow.open(map, marker)
});
})(marker, data);
latlngbounds.extend(marker.position);
}
var bounds = new google.maps.LatLngBounds();
map.setCenter(latlngbounds.getCenter());
map.fitBounds(latlngbounds);
}
function async getData() {
let url = `http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8`;
let response = await fetch(url);
if (response.ok) {
let json = await response.json();
window.alert(json);
} else {
alert("HTTP-Error: " + response.status);
}
}
}
</script>
<div id="dvMap" style="width: 100%; height: 600px">
</div>
<div style="width: 100%; height: 270px">
<canvas id="mixed-chart" width="1000" height="270"></canvas>
</div>
</body>
</html>
所以錯誤在這一行:
let url = `http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8`;
我可以舉一些例子來解決這個問題嗎?
我嘗試了不同的方法來從 API 獲取數據,但是每種方法的錯誤都是一樣的。
這是警告的截圖...
let url = `http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8`;
可能不是拋出實際錯誤的地方,我認為是
let response = await fetch(url);
因為你沒有用 async 標記你的getData
函數,所以你不能在getData
函數中使用await
。
async function getData() {
let url = `http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8`;
let response = await fetch(url);
if (response.ok) {
let json = await response.json();
window.alert(json);
} else {
alert("HTTP-Error: " + response.status);
}
}
或.then
function getData() {
let url = `http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8`;
fetch(url).then(res => {
if (res.ok) {
let json = await response.json();
window.alert(json);
} else {
alert("HTTP-Error: " + response.status);
}
})
}
只需嘗試使用 "" 而不是. Use
. Use
時,你從這樣的一個對象的URL把一個值:常量URL = http://192.168.0.1:3000/sdfasdfadf/${data.id}
;
試試這個: const url = "http://192.168.0.1:3000/?date=2019-10-20&id=1010&daysForward=8"
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