StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POHow do I get the value of a textarea?
text
Body
copied!<p>This is a follow up to <a href="https://stackoverflow.com/questions/8114926/can-i-test-xmlhttprequest-in-sdk-with-localhost">my other question</a>. I am asking again because this seems more a javascript question than a Google App Engine question.</p> <p>I have a form</p> <pre><code><form name="choice_form" id="choice_form" method="post" action="/g/choicehandler" onsubmit="writeToStorage()"> <textarea name="choice" rows="7" cols="50"></textarea><br /> <input type="submit" value="submit your choice"> </form> </code></pre> <p>I want to take the value of this <code>textarea</code> and send it to the app with <code>formData</code>. I tried this</p> <pre><code> var choice = document.getElementById("choice_form").value; </code></pre> <p>but I get "undefined" for the value of "choice". What am I doing wrong? </p> <p>And also, if I understand correctly, the <code>/g/choicehandler</code> is called twice once by the form and once by the XHR. How do I fix that? Below is the handler:</p> <pre><code>class Choice(webapp.RequestHandler): def get(self): self.response.out.write(""" <html> <head> <script type="text/javascript"> var count = 0; function writeToStorage() { var user = "user" + count; count++; localStorage.setItem("chooser", user); var choice = document.getElementById("choice_form").value; var formData = new FormData(); formData.append("chooser", user); formData.append("choice", choice); var xhr = new XMLHttpRequest(); xhr.open("POST", "http://localhost:8086/g/choicehandler", true); xhr.onreadystatechange = function (aEvt) { if (xhr.readyState == 4 && xhr.status == 200){ console.log("request 200-OK"); } else { console.log("connection error"); } }; xhr.send(formData); //added this per Aaron Dufour's answer return 0; }; </script> </head> <body> //changed onsubmit like this: onsubmit="return writeToStorage(); as per Aaron Dufour's answer <form name="choice_form" id="choice_form" action="/g/choicehandler" method="post" onsubmit="writeToStorage()"> <textarea name="choice" rows="7" cols="50"></textarea><br /> <input type="submit" value="submit your choice"> </form> </body> </html>""") </code></pre> <p><strong>UPDATE</strong></p> <p>See <a href="https://stackoverflow.com/questions/8116545/how-do-i-get-the-value-of-a-textarea/8116770#8116770">Aaron Dufour's answer</a> for the solution.</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload