Web Front-endJS TutorialThe difference between request, request.form and request.querystring in Jquery_jqueryThe difference between request, request.form and request.querystring in Jquery_jquery
Request.Form is to obtain form data submitted by POST;
Request.QueryString is mainly used to obtain address bar parameters or data submitted by Get method
Request includes the above two methods, and the variables will be queried in both Request.QueryString and Request.Form. But the data submitted by GET method is obtained first, that is, Request.QueryString
Request: includes the above two methods (the data submitted by GET method is obtained first), it will search in QueryString, Form, and ServerVariable.
And sometimes you get different results. If you just need a piece of data in the Form, but you use Request instead of Request.Form, the program will also search in QueryString and ServerVariable.
If there happens to be an item with the same name in your QueryString or ServerVariable, the value you get is not the value you originally wanted.
request.querystring is used to receive the address? The following xx=xx content
And request.form is used to receive data submitted from the form
For example request("offline")
No matter which of the above methods is used, the field value can be read
request.form refers to the data submitted using form. The request.querystring refers to the URL submitted. You are using login.asp?offline=true, which is of course submitted by the URL.
Request.Form and Request.QueryString receive parameters from different sources. The former receives parameters from the form, while the latter receives parameters from the URL.
You have this sentence logon.asp?offline=true which is the passing parameter of the URL.
If you want to use Request.Form(), the page must have at least a form, such as:
<form name=form1 method=post action=logon.asp> <input type=text name=user value=""> </form>
In this way, after submitting the form, you can use Request.Form("user") to get the value passed by the text box.
request.querystring和request.form的区别
request.querystring是用post方法读取的 不安全
request.form是用get方法读取的
form表单中的method中看你是get还是post
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<p>
<%
if request.querystring("offline")="true" then
session.Abandon()
response.Redirect("login1.htm")
end if
%>
欢迎进入：<%=request.Form("user")%></p>
<p>当前联机人数为：</p><%=application("onlinenum")%>
<p><a href=login.asp?offline=true>离开</a></p>
</body>
</html>
Summary;
1.Request.form method, which is used to receive form variables (post method)
2.Request.QueryString method, which receives URL parameters (get method)
3. The Request object does not need to specify the specific use of QueryString or form methods, such as request("variable"), because it can automatically recognize it, but it is better to specify it, otherwise it will take a while for it to judge by itself. , affecting program execution efficiency. Request: includes the above two methods (the data submitted by GET method is obtained first), it will search in QueryString, Form, and ServerVariable.
In addition to different receiving methods, the two also have the problem of the amount of data transmitted. There is no limit to the data that the request.form method can receive, while request.QueryString can only receive data with a data amount less than 2KB. Of course, the execution speed of the latter is Faster than the former. Generally, the request.QueryString method is used when requesting a query to the database. Because there are only a few keywords in the query, there is no need to use the request.form method, which will slow down the query speed. In addition, the request.QueryString method will also display the data in the address bar of the client browser, which is less secure. The request.form method does not have the above problems, so it is widely used in multiple text fields to submit data and user login
ps: The difference between get and post
The get method exposes parameters and parameter values to visitors, so it is unsafe. Moreover, the parameter length transmitted by the URL is limited, but it is convenient.
The length of parameters transmitted by the post method can be very large, and the parameters and parameter values are not visible to visitors.
Summary:
When using request("Reportdate") to read the value corresponding to the passed data "Reportdate", the parameters transmitted by either the get method or the post method can be read. The reason is that it uses request.querystring to read by default. Get it and then use request.form to read it, that is, reading it twice will naturally be slower and unsafe.
Example:
public string ReportDate
{
get { return Request.QueryString["reportDate"]; }
}
The request object has five collections, which are introduced below:
QueryString
: used to obtain the information in the query string appended by the client to the url address.
For example: stra=Request.QueryString ["strUserld"]
Form
: used to obtain the information entered by the client in the FORM form. (The method attribute value of the form needs to be POST)
For example: stra=Request.Form["strUserld"]
Cookies
: used to obtain the client’s cookie information.
For example: stra=Request.Cookies["strUserld"]
ServerVariables
: Used to obtain the header information and server-side environment variable information in the HTTP request information issued by the client.
For example: stra=Request.ServerVariables["REMOTE_ADDR"], returns the client IP address
ClientCertificate
: used to obtain the client’s authentication information
For example: stra=Request.ClientCertificate["VALIDFORM"], for websites requiring security verification, returns the valid start date.
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