ajax向后台发送数据:
①post方式
ajax:
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@app .route( "/find_worldByName" ,methods = [ 'POST' ])
type : 'post' ,
data:{ 'cname' :cname, 'continent' :continent},
这是post方式传值
那么在后台接收就是:(使用request的form方法)
continent = request.form.get( "continent" )
cname = request.form.get( "cname" )
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②get方式(url参数)
使用request的values方法
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使用request的values方法
data:{ 'cname' :cname, 'continent' :continent},
name = request.values.get( "cname" )
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总结:
这两种的区别就是数据在ajax data里的发送方式不同(get和post),所以在后台接收的时候也会不同。
使用request.form.get 方式获取的是一个json字符串(在这个方法会自动转化json对象,可以直接用key访问)
使用request.values.get 方式获取的是通过url传递的get参数
下面的代码是整个流程实现:ajax:
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/ / 查询js
function find_res(){
var cname;
var continent;
/ / $.ajax
/ / ({
/ / method: "post" ,
/ / url: "http://localhost:8080/PycharmProjects/Cov/templates/world.html?_ijt=q6ulfhihrfp8rqkl8id73svio3" ,
/ / success:function(data)
/ / {
/ / / / form表单数据的转化,转化成[ { name: , value: },{ name: , value: } ]
/ / all = $( '#find_value' ).serializeArray()
/ / / / console.log( all [ 'cname' ])
/ / console.log( all [ 0 ])
/ / cname = all [ 0 ][ 'value' ]
/ / alert(cname)
/ / }
/ / })
cname = document.getElementById( "cname" ).value
continent = document.getElementById( "continent" ).value
console.log(cname + continent)
/ / alert( "表单数据: " + "国家:" + cname + "大洲:" + continent)
$.ajax
({
/ / sync:true,
url: "/find_worldByName" ,
/ / type : 'post' ,
data:{ 'cname' :cname, 'continent' :continent},
success:function (data)
{
/ / alert( "!!!" )
table_data = data.data;
for (var i = 0 ;i<table_data.length;i + + )
{
/ / console.log(table_data[i]);
}
var appendHTML = "";
if ($( ".map-table tbody tr" ).length> 0 ){
$( ".map-table tbody tr" ).remove();
}
/ / alert( "list长度:" + table_data.length)
for (var i = 0 ; i<table_data.length; i + + )
{
/ / 分割日期字符串
strdt = table_data[i][ 1 ].split( " " );
strdt = strdt[ 0 ] + strdt[ 1 ] + strdt[ 2 ] + strdt[ 3 ]
appendHTML = "<tr align='center' style='color:aquamarine;'><td>" +
strdt + "</td><td>" +
table_data[i][ 2 ] + "</td><td>" +
table_data[i][ 5 ] + "</td><td>" +
table_data[i][ 8 ] + "</td><td>" +
table_data[i][ 9 ] + "</td><td>" +
table_data[i][ 4 ] + "</td><td>" +
(i + 1 ) + "</td></tr>" ;
$( ".map-table tbody" ).append(appendHTML);
}
}
})
}
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前台html:
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<table align= "center" style= "margin:3px" cellspacing= "7px" >
<form id= "find_value" >
<label><font color= "#ff7f50" >输入国家:</font></label>
<input id= "cname" type= "text" name= "cname" placeholder= "" value= "" >
<label><font color= "#ff7f50" >输入大洲:</font></label>
<input id= "continent" type= "text" name= "continent" placeholder= "" value= "" >
<input type= "button" value= "查询" onclick= "find_res()" >
<input type= "reset" value= "重置" >
</form>
<thead>
<tr style= "color: #FFB6C1" >
<th>时间</th>
<th>国家</th>
<th>累计确诊</th>
<th>累计治愈</th>
<th>累计死亡</th>
<th>现存确诊</th>
<th>排名</th>
</tr>
</thead>
<tbody id= "bd_data" >
</tbody>
</table>
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Python flask路由:
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@app .route( "/find_worldByName" )
def find_worldByName():
#获取用户传来的数据
# jsondata = json.loads(request.form.get('jsondata'))
res = []
#get方式
cname = request.values.get( "cname" )
continent = request.values.get( "continent" )
#post方式
# continent = request.form.get("continent")
# cname = request.form.get("cname")
# print(cname+continent)
res = utils.find_worldByName(cname,continent)
# res = utils.find_worldByName("美国", "")
# print(res)
return jsonify({ "data" : res})
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后台获取数据库数据:
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def find_worldByName(c_name,continent):
print (c_name)
print (continent)
sql = " SELECT * FROM world WHERE 1=1 "
if (c_name! = None ):
sql = sql + "AND ( c_name LIKE '%" + c_name + "%' )"
if (continent! = None ):
sql = sql + " AND ( continent LIKE '%" + continent + "%') "
sql = sql + " AND dt=(SELECT dt FROM world order by dt desc limit 1) order by confirm desc "
# "AND continent LIKE '%%%%%s%%%%'" \
# " order by dt desc " %(c_name,continent)
# sql_temp = " SELECT * FROM world WHERE c_name LIKE '%"+c_name+"%' "
res = query(sql)
list = []
for i in res:
# print(i)
list .append(i)
return list ;
def query(sql, * args):
"""
通用封装查询
:param sql:
:param args:
:return:返回查询结果 ((),())
"""
conn , cursor = get_conn()
print (sql)
cursor.execute(sql)
res = cursor.fetchall()
close_conn(conn , cursor)
return res
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原文链接:https://www.cnblogs.com/rainbow-1/archive/2021/04/11/14643706.html