Interaction between js and jsp .........

A solution to the problem of JSP data and JavaScirpt Data Interaction <br/> for WEB programs, front-end (JavaScript) and backend (JSP/Servlet) cannot share data, only the back-end program (JSP) can output data and generate pages to the front-end. At this time, the JavaScript code in the generated page may obtain the so-called jsp data. Similarly, JavaScript data can be obtained in JSP programs only when the data in JavaScript is submitted to the backend JSP code. </P> <p> how can we use jsp data in page JavaScript or page JavaScript data in jsp? </P> <p> 1. How do I submit JavaScript data on the page to the jsp program in the background? <br/> ① can I use xxx. JSP as the JavaScript data? Var1 = aaa & var2 = bbb is used as URL parameters to pass to the JSP program. In this case, <br/> <% String strVar1 = request. getParameter ("var1"); %> to get the data passed by the JavaScript script; <br/> ② use JavaScript to add hidden domain information to the form, then, the data is transmitted to the JSP program through form submission. </P> <p> refer to the following script: <br/> <mce: script language = "JavaScript"> <! -- </P> <p> /******************************* ******************************* </p> <p> JavaScript script, you can use the insertclick () function to obtain the variable varMC passed to the page by JSP, <br/> then, you can modify the value of this variable in JavaScript, and submit it to the JSP program in the form of <br/> post. <Br/> ************************************ * *************************/<br/> function insertclick () {<br/> var1 = document. all. mc. value; // get the variable value in form <br/> var1 = var1 + "name"; <br/> document. insertForm. submit (); <br/>}< br/> // --> </mce: script> </p> <! -- Html page form, the location on the html page is unlimited --> <br/> <form name = "insertForm" method = "post" action = "yourJSP"> <br/> <! -- The following sentence gets the variable value passed in the JSP program --> <br/> <input type = "hidden" name = "mc" value = "<% = varMC %> "> <br/> <input type =" button "value =" Submit "onclick =" insertclick () "> <br/> </form> </p> <p> 2. How to use the data of JSP programs in the background for JavaScript data on the page <br/> This is relatively simple, you can directly use <% = strVar1 %> In the JavaScript script to pass the data in the jsp program to the JavaScript script. </P> <p> refer to the following Script: </p> <! -- Html page form, the location on the html page is unlimited --> <br/> <form name = "insertForm" method = "post" action = "yourJSP"> <br/> <input type =" hidden "name =" mc "value =" "> <br/> </form> </p> <mce: script language = "JavaScript"> <! -- </P> <p> /******************************* ******************************* </p> <p> JavaScript script, you can use JavaScirpt to obtain the variable varMC passed to the page by Using JSP, <br/> then you can use the value of this variable in JavaScript and assign a value to the hidden field in form through the <br/> JavaScript script. <Br/> ************************************ * *************************/<br/> var1 = "<% = varMC %> "; // obtain the variable value in JSP <br/> document. all. mc. value = var1; <br/> // --> </mce: script> </p> <p> quotation marks must be placed here ..........