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:.
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.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Yesmost notably!
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.
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.
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.
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.
How to get the selected value from drop down list in jsp? Ask Question.
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?
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.