You must have come across many situations when you need to pass some information from your browser to the web server and ultimately to your backend program.

The browser uses two methods to pass this information to the web server. The GET method sends the encoded user information appended to the page request.

The page and the encoded information are separated by the? The GET method is the default method to pass information from the browser to the web server and it produces a long string that appears in your browser's Location:box. It is recommended that the GET method is better not used.

This method packages the information in exactly the same way as the GET method, but instead of sending it as a text string after a? This message comes to the backend program in the form of the standard input which you can parse and use for your processing.

JSP handles this type of requests using getParameter method to read simple parameters and getInputStream method to read binary data stream coming from the client. Below is the main. We are going to use the same JSP main.

Infact there is no change in the above JSP because the only way of passing parameters is changed and no binary data is being passed to the JSP program. File handling related concepts will be explained in separate chapter where we need to read the binary data stream. Let us now keep main. Try to enter the First and the Last Name and then click the submit button to see the result on your local machine where tomcat is running.

Following is main. Following is a generic example which uses getParameterNames method of HttpServletRequest to read all the available form parameters. This method returns an Enumeration that contains the parameter names in an unspecified order.

Once we have an Enumeration, we can loop down the Enumeration in the standard manner, using the hasMoreElements method to determine when to stop and using the nextElement method to get each parameter name. Now try calling JSP using the above Hello. You can try the above JSP to read any other form's data which is having other objects like text box, radio button or dropdown, etc.

Previous Page. Next Page. Previous Page Print Page.This method is one of the most common methods in the HTML DOM, and is used almost every time you want to manipulate, or get info from, an element on your document.

Get value of selected row from table JSP

An ID should be unique within a page. However, if more than one element with the specified ID exists, the getElementById method returns the first element in the source code. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:.

Example Get the element with the specified ID: document. HOW TO. Your message has been sent to W3Schools. W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using this site, you agree to have read and accepted our terms of usecookie and privacy policy.

Copyright by Refsnes Data. All Rights Reserved. Powered by W3. An Element Object, representing an element with the specified ID. Returns null if no elements with the specified ID exists.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a text box element whose value I am trying to access using document.

I find that the call is returning a null instead of empty string. The data-type of the returned value is still string. Is null a string value?

How to get element by name in HTML – getElementsByName

Posting your HTML might help a bit. Instead, you can get the element first and then check if it is null or not and then ask for its value rather than just asking for the value directly without knowing if the element is visible on the HTML or not. Entering a non-number will clear it before your script knows what's going on. So remove the document. Please check this fiddle and let me know if you get an alert of null value. I have copied your code there and added a couple of alerts.

Just like others, I also dont see a null being returned, I get an empty string. Which browser are you using? I think the textbox you are trying to access is not yet loaded onto the page at the time your javascript is being executed.

If the javascript is getting called before the textbox is written onto the page, the textbox will not be visible and so NULL is returned. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Yesmost notably!

get element value in jsp

I don't think the second one will work and if it does, not very portably. The first one should be OK. In the second version, you're passing the String returned from this. Not the element itself. It makes the most sense to just pass the element with this instead of fetching it again with its ID.

There is no difference if we look on effect - value will be the same. However there is something more How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Asked 9 years, 4 months ago. Active 11 months ago. Viewed k times. Is there any difference between these solutions? Adam Adam 47k 57 57 gold badges silver badges bronze badges. Edit: As several have pointed out, there are a few typos including the lack of a function name in the javascriptbut conceptually, they are the same and either one will work fine.

The edits, which were made after 3 years made most of the answers here invalid. Active Oldest Votes. Update: the question was edited. Both of the solutions are now equivalent.

It goes for element arrays as well. Example: items[i]. Would you care to explain why you think your answer is what I would want to go with? Barrosy getting the id and then using getElementById is unneccesary when you have a reference to the element already solution 2. Passing parameters explicitly solution 1 can sometimes be a good programming practice. Evan Mulawski Evan Mulawski So id. You would need to pass the element with this. L 8, 8 8 gold badges 45 45 silver badges 81 81 bronze badges.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.It is populated from my oracle db. Im able to display my expected output correctly. But when I'm trying to get the selected row through clicking the corresponding button, I'm always getting the 1st row value, i.

It always display the 1st row. You can kindly see the image below. Hoping someone can guide me to my problem. Still cant get the specific row value from the table.

Always prompting "". Any tips to overcome this? Also, I realize its not really the way I should write javascript inside html tags, am I right?

Tried already using jquery to get the taskid but it displays only the first row, but only your solution works! Correction for button action and hidden field value.

Implicit Objects in JSP

Edited 6 Years Ago by radhakrishna. Edited 6 Years Ago by batuzai I am facing same issue. Getting Started: Have something to contribute to this discussion? Please be thoughtful, detailed and courteous, and adhere to our posting rules.

Edit Preview. H1 H2. Post Reply. Insert Code Block. Share Post. Permanent Link. Promote Question. Would you like to see this question answered quickly?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

getAttribute() – Passing data from Server to JSP

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I know that this is an old question, but as I was googling it was the first link in a results. So here is the jsp solution:. The only reason your code might fail is when there is no item selected, then the selectedIndex returns -1 and the code breaks. Learn more.

get element value in jsp

How to get the selected value from drop down list in jsp? Ask Question.

get element value in jsp

Asked 7 years, 3 months ago. Active 2 years, 10 months ago. Viewed k times. Pearl Pearl 1 1 gold badge 4 4 silver badges 12 12 bronze badges. Active Oldest Votes. JohnRose JohnRose 3 3 silver badges 10 10 bronze badges. Milind Anantwar Milind Anantwar Thanks Milind How can we achieve this without javascript and only in jsp? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

How to get element by name in HTML – getElementsByName

Post as a guest Name. Email Required, but never shown.Forum: JSP. Prexa Shah. I like Thanks in advance. Have a nice day Swastik Dey. Is the jsp page is called on submit of any other page?

Or else how could you expect the following request. Ankit Tripathi. Welcome to javaranch,Prexa You can't retrieve a javascript variable directly from your java code in a JSP.

Because java code in your JSP is going to be executed before HTML is going to be interpreted with javascript at your web browser However to access client-side data on the server, you have to send it from the client to the server,which can be done by using Ajex or jQuery. But here there is one problem the page that i'm passing is fix Hope you got it A bit confusing. Because as far as my knowledge goes, location.

Rajani Gummadi. Irrespective of whether you use ajax or not, if you are using redirectthe unless you set the value again in search. So, if you are employing HTTP redirect, then you need to explicitly set the value in request before sent to result. But if you are using forward, then its a different case, in that the values which is set in admin.


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