从HTML访问flask变量 [英] flask variable access from HTML
问题描述
app.py
@app.route('/cma/connect', methods=['GET', 'POST'])
def connect_management():
user = request.form.get('all_classes')
print('user:', user)
return str(user)
@app.route('/')
def index():
return render_template('app.html',
all_classes=default_classes)
app.html
<select name="selected_cma" class="form-control" id="all_classes">
{% for o in all_classes %}
<option value="{{ o }}" selected>{{ o }}</option>
{% endfor %}
</select>
</div>
<div class="form-group col-xs-3">
<label for="all_entries">the manager</label>
<button class="form-control" id="button" onclick="connect()">the reciever</button>
<p id="countdown"></p>
app.html中的
js代码
js code inside the app.html
$('#button').click( function(event) {
event.preventDefault();
$.post("/cma/connect", $('#form').serialize(), function(data) {
//alert(data);
countdown = $("#countdown");
countdown.append(data + "<br/>");
});
});
我的结果
user: None
127.0.0.1 - - [19/Jun/2020 10:03:11] "POST /cma/connect HTTP/1.1" 200 -
我想要什么
user: (the selected option from the dropdown menu)
总结问题
我想将选定的选项返回到我的flask api中以进一步使用并显示它，而无需转到新的 tab
i want to get the selected option back to my flask api for further usage and display it without going to a new tab
有什么新方法吗?
推荐答案
如果您不想在代码中使用< form> (这很奇怪)，则可以尝试
If you don't want to use <form> in code (which is very strange) then you can try
<script>
$('#button').click( function(event) {
event.preventDefault();
var selected = $("#all_classes :selected").val();
alert("selected: " + selected);
$.post("/ra/connect", {"selected_cma": selected}, function(data) {
//alert(data);
countdown = $("#countdown");
countdown.append(data + "<br/>");
});
});
</script>
其余部分应该相同.
JavaScript 发送 {"selected_cma":selected} ，因此 Flask 必须在 form.get('selected_cma')
@app.route('/cma/connect', methods=['GET', 'POST'])
def connect_management():
user = request.form.get('selected_cma')
print('user:', user)
return str(user)
和
<select name="selected_cma" class="form-control" id="all_classes">
{% for o in all_classes %}
<option value="{{ o }}" selected>{{ o }}</option>
{% endfor %}
</select>
</div>
<div class="form-group col-xs-3">
<label for="all_entries">the manager</label>
<button class="form-control" id="button">the reciever</button>
<p id="countdown"></p>
并且不需要 onclick ="onclick()" ，因为 $('#button').click(...)已经分配了功能.而且，如果您具有某些功能 onclick()，那么它还会带来其他一些问题.
And don't need onclick="onclick()" because $('#button').click(...) already assign function. And if you have some function onclick() then it can makes some other problems.
最低工作代码
from flask import Flask, request, render_template_string
app = Flask(__name__)
@app.route('/')
def index():
return render_template_string('''<html>
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<select name="selected_class" class="form-control" id="all_classes">
{% for o in all_classes %}
<option value="{{ o }}" selected>{{ o }}</option>
{% endfor %}
</select>
<button class="form-control" id="button">Get gateways</button>
<p id="countdown"></p>
<script>
$('#button').click( function(event) {
event.preventDefault();
var selected = $("#all_classes :selected").val();
alert("selected: " + selected);
$.post("/ra/connect", {"selected_cma": selected}, function(data) {
//alert(data);
countdown = $("#countdown");
countdown.append(data + "<br/>");
});
});
</script>
</html>''', all_classes=['Hello', 'World'])
@app.route('/ra/connect', methods=['GET', 'POST'])
def connect_management():
print(request.form)
print(request.data)
user = request.form.get('selected_cma')
print('user:', user)
return str(user)
app.run()
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