Is there any way to pass the value of a parameter from a Servlet to JavaScript ?
the following didn't work.
var val = req.getParameter('valid');
This won't work because the ServletRequest only exists at the server and your JavaScript is running at the browser. It is easy to get the difference confused, because the code that runs on the server and the code that runs in the browser are very often both written in the same file (someServlet.java or somePage.jsp), so you have to remember how everything will sit at runtime.
What you can do, as a way of passing information that is retrieved from the request in the servlet to the JavaScript, is embed the data in the structure of the page on the server side. The page and its structure are then passed to the browser and the JavaScript has access to the full page structure on the client side. So you put something like this in the servlet:
<form name="data" action="" >
<input type="hidden" id="parmEmpId"
value='<%= request.getParameter( "EMPLOYEE_NUMBER" ) %>' />
<input type="hidden" id="parmServerName"
value="<%= request.getServerName() %>" />
</form>
And then, in your JavaScript, you can pull the data from the page:
var employeeId = $("#parmEmpId").val(); //Using jQuery
var server = $("#parmServerName").val(); //Using jQuery
Related
I am new to html and javascript coding. So i have encountered a problem where i have to send a variable to a specific page and call that function out when needed.
function submit() {
firstname = document.getElementByName("firstname");
document.write(firstname);
}
<html>
<body>
<form>
<p>firstname: <input type="text" name="firstname" />
</p>
<input type="submit" onclick="submit()" />
</from>
</body>
</html>
now what should i do if i want to display the first name on a specific html page in javascript. For example, if i want to display the person name on third page then what should i do.
When you need to pass on an information from one page to another in the web, the general way you do is to use server side sessions. As I can see that there's no server side languages you are using, I believe you have only two options:
Using Query String Parameters (this works all the time).
Using Cookies (if the user has enabled it).
Using Local Storage (if your browser supports it).
For the first option, see How can I get query string values in JavaScript? For the second option, it's been answered a lot of times, so I'll leave the implementation with you: Set cookie and get cookie with JavaScript.
For the second one, you just need to use localStorage object this way:
function submit() {
var firstname = document.getElementByName("firstname");
document.getElementById("output").innerHTML = firstname;
if (!!window.localStorage) {
localStorage.setItem('firstname', firstname);
}
return false;
}
<form onsubmit="return submit();">
<p>firstname: <input type="text" name="firstname" /></p>
<input type="submit" onclick="return submit();" value="Save" />
</form>
<div id="output"></div>
I have also made some changes in your form submission method. And in your new page, you just need to use this code to get the item.
function getname() {
return localStorage.getItem('firstname');
}
There are multiple ways to resolve this issue but it is based upon your requirements. Are you going to third or any other page via a server navigation or is it client-side navigation. In any case you can use localstorage which is supported by almost all latest browser.
On first page you can do localStorage.setItem('firstName', 'Tom'); localstorage is globally available keyword.
On any other page then you can get the value by
var name = localStorage.getItem('firstName');
Other options you can look at cookies, querystring and session storage
when redirecting to next page, bind parameters in redirecting url like this,
window.location.href = "http://yoursite.com/page?data1=one&data2=two";
And fetch them from retreiving end like below,
var url_string = "http://yoursite.com/page?data1=one&data2=two";
var url = new URL(url_string);
var parameter_1 = url.searchParams.get("data1"); //returns "one"
var parameter_2 = url.searchParams.get("data2"); //returns "two"
I have tried to call some API, and the API gives a html response whose content is an auto submit form by onload. so the question is How to submit the form obtained from the response API?
jquery function :
$.get( "example.html", function( data ) {
//response is html
});
response from APi (example.html) :
<!DOCTYPE html>
<html>
<head></head>
<body onload="submitOnLoad.submit();">
<form id="submitOnLoad" method="POST" action="example.com/save">
<input type="hidden" name="name" value="john" />
<input type="hidden" name="birthday" value="23-03-2003" />
</form>
</body>
</html>
Edit :
I'm sorry I was not clear. I need other solution.
First, jQuery is just a library of functions to make coding easier, especially the short hand for browser api's.
Second, you wouldn't want to get an html page via ajax, because the browsers can anyways handle the request over a webserver.
Ajax is mostly used with Restful Server end points for Data exchange, rather than getting entire HTML files.
However, if you are only playing around to learn, try this snippet. be sure to pass the html string.
$.get( "example.html", function( data ) {
$('body').html(<response html string>)
});
I have html code:
<input type="text" name="username" id="username">
How can I get username's value in my scriplet ?
<% String username= request.getParameter("username");
%>
But it doesn't work for me
How can I solve this?
First make sure that requestObject is only available when you send the requestto the server or Submit the form .
on Client side pass Some action inside form tag and mapped into XML file
<form action="Submit.do">
from server side like servlet/Strtus/JSP you can access requestobject using
<% request.getParameter("inputid");%>
if you calling Same page after Submitting the data then on scriptlet check for request object if it null then don't perform any action else get the object
I opened up a yahoo store through their Merchant Service. They have a pretty good store catalog that I have used on a business site that I own. I like it so I decided to use the service again on another business I own. I got the site built but have ran into a few issues with calling the Yahoo Catalog Tags. The tags are basically comments. EX: (<!--#ystore_order id=item_id -->). When the site is loaded it is parsed and the page loads the product details in place of this tag/comment.
I can get everything to work except for the action attribute of my form.
I have tried a bunch of things but I cannot seem to get the action set for my form. If I hard code the tag then it works fine but obviously if I did that then I would have to create a page for every single product.
My form:
<div id="list">
<form method="post">
<input id="btnSubmit" type="submit" value="Add To Cart">
</form>
</div>
Trying to add the comment/tag to form action attribute. I've done it this way(below) and also by getting rid of the variable and just paring the url in the jquery attr function.
<script language="javascript">
$.ajaxSetup({cache: false});
$(document).ready(function(){
//Get URL from URL Query String.
var obj = getUrlVars()["Object"];
//Set form action attribute
$('form').attr('action', '<!--#ystore_order id='+ obj +' -->');
});
</script>
I've also tried creating the form dynamically.
<script language="javascript">
$.ajaxSetup({cache: false});
$(document).ready(function(){
//Get URL from URL Query String.
var obj = getUrlVars()["Object"];
var new_form = '<form method="post" action="<!--#ystore_order id='+obj + ' -->">' +
'<input type="submit" value="Add To Cart" id="btnSubmit">' +
'</form>';
$('#list').append(new_form);
});
</script>
I have tried to escape some characters but have had no success there either.
"\<\!--#ystore_order id='+obj + ' --\>"
I know the issue has something to do with the comment syntax but if I can add it manually then I should be able to do it dynamically. I know this is a hard one to test but if anyone thinks they may have a solution I would be happy to set up an ftp account on my site so you can test and I will provide the product ID's for testing. I've fought with this for about 30+ hours.
Yahoo store tags are populated server-side. Adding a store tag on the client side using Javascript won't do anything, because the code that recognizes the store tag and appends the appropriate html will never see the tag you drop in on the client side. There's no client-side solution possible
The best solution here would be to write a server side program to populate a template with the appropriate tag in response to http requests. I'm not super-familiar with the Yahoo store, so I don't know what the best language for this would be, but it would be a very simple program given how straightforward it sounds like your template is. Since this is already embedded in a site you own, I'd just use whatever backend language you are already working in.
Once you have a server side script that executes and returns the html you need, you could use AJAX to populated it with the appropriate product details as needed.
I have a HTML form (called form.html)and a JavaScript function such that when form is submitted, information in that form will be displayed.
Now I want all those info will be shown in new HTML page (called confirm.html), where should I go from?
NOTE: No php or sever-side or anything that really seriously related, it's just simple OFFLINE HTML-form problem, I just have 2 html place in same folder, I will test it on my browser, that's it. Only thing that I worry is how to use information from form.html file in confirm.html file since they are obviously separated.
Thank you very much, here is my form.html ( I dont have confirm.html yet)
<HTML>
<HEAD>
<TITLE>Contact</TITLE>
<script type="text/javascript">
function addtext()
{
var fname = document.myform.first_name.value;
var lname = document.myform.last_name.value;
var email = document.myform.email.value;
document.writeln("Thank you! You have just entered the following:");
document.writeln("<pre>");
document.writeln("First Name : " + fname);
document.writeln("Last Name : " + lname);
document.writeln("Email Address : " + email);
}
</script>
</HEAD>
<BODY>
<center>
<b>CONTACT US</b> <br></br>
<form name="myform">
<label for="first_name">First Name </label>
<input type="text" name="first_name" maxlength="50" size="30">
<br>
<label for="last_name">Last Name </label>
<input type="text" name="last_name" maxlength="50" size="30">
<br>
<label for="email">Email Address</label>
<input type="text" name="email" maxlength="80" size="30">
<br>
<input type="submit" value="Submit" onClick="addtext()">
</form>
</BODY>
</HTML>
Check out the window object of JavaScript: http://www.devguru.com/technologies/javascript/10855.asp
It has a property location, if you write into it, your browser will redirect:
window.location = "http://www.google.com";
Note though, that this will not post your data to confirm.html. what you are trying to do without server-side scripting is not very useful. An HTML form will use CGI (common gateway interface) to send data to a server, that can then process the information. If you use the file:// protocol (as you seem to be doing; all local, static files), there is no server-side to process the data, only JavaScript.
If using the GET method of sending the data through CGI, you could extract the data from the URL using javaScript (as mentioned in another question). To do this, just update your form like this:
<form action="confirm.html" method="get">
And do not put a onClick handler on the submit button, just let it submit.
Many other tools exist though that way more are suitable for the job: server-side scripting languages, examples include PHP, ASP, JSP. For local setups, your best best is using XAMPP.
If you don't want to rely on server-side technology, this becomes more complicated (and hacky, I might add). Probably the easiest would be to generate a url like this on submit -
http://localhost/confirm.html?first_name=val1&last_name=val2&email=val3
then add some code to confirm.html to unpack this. Here's a related question you may find helpful.
If you'd allow me a moment of editorializing, what exactly are you trying to do? If this is just a personal project to see how html works, then I'd strongly recommend starting to learn about server-side technology - once you start wanting to handle user data and persist state, you're pretty much forced to use the server. The web is by design pretty stateless; you can't pass variable in-between pages without either using the server, or through some very complicated AJAX & DOM updating techniques which tend to rely on specialized server files anyway. You can run a PHP & MySQL server locally using existing technology, and if you're interested in expanding your knowledge of web technology this is an inevitable step.