JSP page value passing Method

Several Methods for passing JSP page values:
1. Hide the field transfer value:
<Form method = "Post" Action = "client_crud.jsp">
<Input type = "hidden" name = "ID" value = "<% = ID %>">

2. url transfer value:
Use button
A.
<Input name = "btnmodify" type = "button" class = "button1" onclick = "self. Location = 'client _ modify. jsp? Id = <% = ID %> '"
Value = "Modify distributor"/>
B. Set the onclick = "modifyregion ()" of input ()"
Function modifyregion (){
Window. Self. Location = client_node_modify.jsp? Id = <% = ID %> ";
}

3. Pass values in JS Mode
// Obtain the form object submission form
With (document. getelementbyid ("userform ")){
Method = "Post ";
Action = "user_add.jsp? Command = Add ";
Submit ();
}
 
Function searchitem (){
With (document. Forms [0]) {
Action = "Servlet/basedata/searchitemservlet ";
Method = "Post ";
Submit ();
}
}

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Parameters of JSP:
 
Parameters of JSP:
 
I. Hyperlinks
<A href = "P. jsp? Username = zhangshan & Pwd = 123456 & age = 25 "> link </a>
 
Ii. Forma form
1. display controls
<Input type = "text" name = "username">
 
2. If the value to be passed is not displayed on the page
(1) <input type = "hidden" name = "PWD" value = "<% = PWD %>">
(2) <form action = "XXX. jsp" method = "Post"> </form>
 
Iii. jsp include and forward labels
<JSP: Include flush = "true" page = "T. jsp? Username = zhangshan & Pwd = 123456678 ">
<JSP: Param name = "Age" value = "28"/>
</Jsp: Include>
 
Iv. Javascript
Script Type = "text/JavaScript">
Function demo (){
VaR v = Document. All ('username'). value;
Location. Replace ("V. jsp? Username = "+ V +" & age = 25 ");
}
</SCRIPT>
<Input type = "text" name = "username"> <br>
<Input type = "button" value = "href click" onclick = "location. href = 'v. jsp? Pwd = 123456 '"> <br>
<Input type = "button" value = "replace click"
Onclick = "location. replac ('v. jsp? Pwd = 123456789 ') ">
<Br>

<Input type = "button" value = "dynamic value" onclick = "demo ()">