[英]Having Issues with handling Python dictionaries in Javascript flask templates
因此,我正在使用 flask 構建一個 web 應用程序,該應用程序可以跟蹤多輛車輛並提供更新。 python 腳本有助於收集所有數據並將它們放入字典中。
I am sending this dictionary over to the index.html with the javascript code within the HTML that initializes a map and places markers based on the coordinates received from python.
我遇到的問題是這本字典沒有在 js 中正確解析,因此我沒有得到任何數據。
現在我有 {{truck_dict}} 占位符來保存 html 中 python 的字典 object。
PS。 我不是最擅長 JS 所以不要評判 XD
#Python Code
return render_template('pages/index.html', trucks = truck.driver_locator(truck.locations()))
#Even when I jsonify/json.dump the variable in the trucks object, nothing happens
#JS Code
var truck_dict = {{trucks | tojson}}
var i;
for (var key in truck_dict){
var value = truck_dict[key];
var geojson = {
type: 'FeatureCollection',
features: [{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: value
},
properties: {
title: 'Mapbox',
description: '1303'
}
}]
};
python 生成的字典的樣本 OUTPUT
{'1301': [43.1220307, -78.9352247], '1302': [42.3107737, -77.2519131], '1304': [40.3809016, -74.5665863], '1305': [40.2453049, -74.5707928], '1303': [39.6435448, -75.9325289]}
這是 output:
var truck_dict = {'1301': [43.1220307, -78.9352247], '1302': [42.3107737, -77.2519131], '1304': [40.3809016, -74.5665863], '1305': [40.2453049, -74.5707928], '1303': [39.6435448, -75.9325289]};
for (var i in truck_dict) {
console.log(i, truck_dict[i]);
}
output:
1301 [43.1220307, -78.9352247]
1302 [42.3107737, -77.2519131]
1303 [39.6435448, -75.9325289]
1304 [40.3809016, -74.5665863]
1305 [40.2453049, -74.5707928]
因此,您需要記錄 truck_dict,例如:
var truck_dict = {{trucks | tojson}};
console.log(trucks);
console.log(truck_dict);
您正在嘗試索引字典truck_dict[I]
在這里不起作用,因為您的索引不是數字(無論如何在 js 中都不可能)。
您需要使用其鍵(例如truck_dict['1301']
或truck_dict.1301
)而不是索引來訪問字典元素。 如果要遍歷每個鍵(您可以使用它來引用映射到該鍵的值),請使用:
for(var key in truck_dict) {
var value = truck_dict[key];
// do what you need with value and key here
}
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