获取select选项Django的值

Question

我遇到了一个问题，如何获取我的选择选项的值，我一直在使用javascript设置选择选项的数值，下面是我的代码，它将省份值返回到数字而不是文本。问题是我如何将数字转换为文本，有没有专家分享这方面的解决方案。

views.py

def sample_data(request):
if request.method=='POST':
province = request.POST['list1']
print(province) #return ex. 2 depend on select value
return render (request,'sample.html')

选择选项-我的参考链接

<select id="list1" name ="list1" onchange="updateList('list2', this);"></select>
<select id="list2" name ="list2" onchange="updateList('list3', this);"></select>>
<select id="list3" name ="list3"></select>

javascript

let data = [{"id":1,"name":"USA","parentid":0},
{"id":2,"name":"Japan","parentid":0},
{"id":3,"name":"Europe","parentid":0},
{"id":4,"name":"California","parentid":1},
{"id":5,"name":"Oklahoma","parentid":1},
{"id":6,"name":"Arizona","parentid":1},
{"id":7,"name":"Kantô","parentid":2},
{"id":8,"name":"Kansai","parentid":2},
{"id":9,"name":"Chügoku","parentid":2},
{"id":10,"name":"France","parentid":3},
{"id":11,"name":"Deutschland","parentid":3},
{"id":12,"name":"Espana","parentid":3},
{"id":13,"name":"Sacramento","parentid":4},
{"id":14,"name":"Los Angeles","parentid":4},
{"id":15,"name":"San Diego","parentid":4},
{"id":16,"name":"Tulsa","parentid":5},
{"id":17,"name":"Oklahoma City","parentid":5},
{"id":18,"name":"Lawton","parentid":5},
{"id":19,"name":"Phoenix","parentid":6},
{"id":20,"name":"Flagstaff","parentid":6},
{"id":21,"name":"Tucson","parentid":6},
{"id":21,"name":"Tokyo","parentid":7},
{"id":22,"name":"Chiba","parentid":7},
{"id":23,"name":"Tochigi","parentid":7},
{"id":24,"name":"Kyoto","parentid":8},
{"id":25,"name":"Osaka","parentid":8},
{"id":26,"name":"Nara","parentid":8},
{"id":27,"name":"Tottori","parentid":9},
{"id":28,"name":"Hirochima","parentid":9},
{"id":29,"name":"Okayama","parentid":9},
{"id":30,"name":"Quimper","parentid":10},
{"id":31,"name":"Toulouse","parentid":10},
{"id":32,"name":"Nancy","parentid":10},
{"id":33,"name":"Dusseldorf","parentid":11},
{"id":34,"name":"Leipzig","parentid":11},
{"id":35,"name":"Munchen","parentid":11},
{"id":36,"name":"Barcelona","parentid":12},
{"id":37,"name":"Sevilla","parentid":12},
{"id":38,"name":"Guernica","parentid":12}]
function populateList(list, pid) {
let l = document.getElementById(list);
l.innerHTML = "";
let topItem = document.createElement("option");
topItem.value = 0;
topItem.text = "--Select--";
l.appendChild(topItem); 
let items = data.filter(item => item.parentid == pid);
items.forEach(function(item){
let newItem = document.createElement("option");
newItem.value = item.id;
newItem.text = item.name;
l.appendChild(newItem);
})
}
function updateList(selList, thisList) {
if (thisList.value != 0) {
populateList(selList, Number(thisList.value));
} else {
let s = document.getElementById(selList);
s.value = 0;
triggerEvent(s, "onchange");
let sCopy = s.cloneNode(false);
let p = s.parentNode;
p.replaceChild(sCopy, s);
}
}
function triggerEvent(e, trigger)
{
if ((e[trigger] || false) && typeof e[trigger] == 'function')
{
e[trigger](e);
}
}

function loadList1() {
populateList("list1", 0);
}
window.onload = loadList1;

Answer 1

您需要在此处传递name值newItem.value，因为在提交选项时，value属性会传递到后端。然后，在更改后，您仍然需要id来填充下一个选择框，这样您就可以创建值为id的自定义属性，然后将其传递给您的函数。

演示代码 :

let data = [{
"id": 1,
"name": "USA",
"parentid": 0
},
{
"id": 2,
"name": "Japan",
"parentid": 0
},
{
"id": 3,
"name": "Europe",
"parentid": 0
},
{
"id": 4,
"name": "California",
"parentid": 1
},
{
"id": 5,
"name": "Oklahoma",
"parentid": 1
},
{
"id": 6,
"name": "Arizona",
"parentid": 1
},
{
"id": 7,
"name": "Kantô",
"parentid": 2
},
{
"id": 8,
"name": "Kansai",
"parentid": 2
},
{
"id": 9,
"name": "Chügoku",
"parentid": 2
},
{
"id": 10,
"name": "France",
"parentid": 3
},
{
"id": 11,
"name": "Deutschland",
"parentid": 3
},
{
"id": 12,
"name": "Espana",
"parentid": 3
},
{
"id": 13,
"name": "Sacramento",
"parentid": 4
},
{
"id": 14,
"name": "Los Angeles",
"parentid": 4
},
{
"id": 15,
"name": "San Diego",
"parentid": 4
},
{
"id": 16,
"name": "Tulsa",
"parentid": 5
},
{
"id": 17,
"name": "Oklahoma City",
"parentid": 5
},
{
"id": 18,
"name": "Lawton",
"parentid": 5
},
{
"id": 19,
"name": "Phoenix",
"parentid": 6
},
{
"id": 20,
"name": "Flagstaff",
"parentid": 6
},
{
"id": 21,
"name": "Tucson",
"parentid": 6
},
{
"id": 21,
"name": "Tokyo",
"parentid": 7
},
{
"id": 22,
"name": "Chiba",
"parentid": 7
},
{
"id": 23,
"name": "Tochigi",
"parentid": 7
},
{
"id": 24,
"name": "Kyoto",
"parentid": 8
},
{
"id": 25,
"name": "Osaka",
"parentid": 8
},
{
"id": 26,
"name": "Nara",
"parentid": 8
},
{
"id": 27,
"name": "Tottori",
"parentid": 9
},
{
"id": 28,
"name": "Hirochima",
"parentid": 9
},
{
"id": 29,
"name": "Okayama",
"parentid": 9
},
{
"id": 30,
"name": "Quimper",
"parentid": 10
},
{
"id": 31,
"name": "Toulouse",
"parentid": 10
},
{
"id": 32,
"name": "Nancy",
"parentid": 10
},
{
"id": 33,
"name": "Dusseldorf",
"parentid": 11
},
{
"id": 34,
"name": "Leipzig",
"parentid": 11
},
{
"id": 35,
"name": "Munchen",
"parentid": 11
},
{
"id": 36,
"name": "Barcelona",
"parentid": 12
},
{
"id": 37,
"name": "Sevilla",
"parentid": 12
},
{
"id": 38,
"name": "Guernica",
"parentid": 12
}
]
function populateList(list, pid) {
let l = document.getElementById(list);
l.innerHTML = "";
let topItem = document.createElement("option");
topItem.value = 0;
topItem.text = "--Select--";
l.appendChild(topItem);
let items = data.filter(item => item.parentid == pid);
items.forEach(function(item) {
let newItem = document.createElement("option");
newItem.value = item.name;//give name value as well in value 
newItem.text = item.name;
var data_id = document.createAttribute("data-id")//crete custom attribute
data_id.value = item.id//set id value there
newItem.setAttributeNode(data_id);//pass same to your option
l.appendChild(newItem);
})
}
function updateList(selList, thisList) {
if (thisList.value != 0) {
populateList(selList, Number(thisList.options[thisList.selectedIndex].getAttribute('data-id')));//get selectedoption data-id value
} else {
let s = document.getElementById(selList);
s.value = 0;
triggerEvent(s, "onchange");
let sCopy = s.cloneNode(false);
let p = s.parentNode;
p.replaceChild(sCopy, s);
}
}
function triggerEvent(e, trigger) {
if ((e[trigger] || false) && typeof e[trigger] == 'function') {
e[trigger](e);
}
}

function loadList1() {
populateList("list1", 0);
}
window.onload = loadList1;

<select id="list1" name="list1" onchange="updateList('list2', this);"></select>
<select id="list2" name="list2" onchange="updateList('list3', this);"></select>>
<select id="list3" name="list3"></select>