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POCan I test XMLHttpRequest() in SDK with localhost?
 

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  1. POCan I test XMLHttpRequest() in SDK with localhost?
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    <p>The following code does not seem to work because when I try to get the "chooser" in Google App Engine (Python) it is undefined: </p> <pre><code>chooser = self.request.get("chooser") self.response.out.write("chooser: %s " % chooser) #returns "chooser:" without any value </code></pre> <p>Is this valid javascript?</p> <pre><code> var formData = new FormData(); formData.append("chooser", user); var xhr = new XMLHttpRequest(); //is it ok to test this with localhost? xhr.open("POST", "http://localhost:8086/g/choicehandler", true); xhr.onreadystatechange = function (aEvt) { if (xhr.readyState == 4 &amp;&amp; xhr.status == 200){ console.log("request 200-OK"); } else { console.log("connection error"); } }; xhr.send(formData); </code></pre> <p>Is the problem with the XHR call or with the App?</p> <p><strong>UPDATE</strong></p> <p>I am including the code in <code>/choice</code> to clarify what "chooser" is as per Daniel Roseman's comment:</p> <p>In <code>/choice</code> handler I have <code>writeToStorage()</code> which assigns a username in the form <code>user1, user2</code> and so on, and writes that to <code>localStorage</code>.</p> <p>After writing user name to <code>localStorage</code> I also need to write it to database in the app, and I use <code>xhr</code> to send it to <code>/g/choicehandler</code> handler.</p> <p>So, "chooser", I believe is a string, made of </p> <pre><code>var user = "user" + count; </code></pre> <p>I copy <code>/choice</code> handler below:</p> <pre><code>class Choice(webapp.RequestHandler): def get(self): self.response.out.write(""" &lt;html&gt; &lt;head&gt; &lt;script type="text/javascript"&gt; var count = 0; function writeToStorage() { var user = "user" + count; count++; localStorage.setItem("chooser", user); var formData = new FormData(); formData.append("chooser", user); var xhr = new XMLHttpRequest(); xhr.open("POST", "http://localhost:8086/g/choicehandler", true); xhr.onreadystatechange = function (aEvt) { if (xhr.readyState == 4 &amp;&amp; xhr.status == 200){ console.log("request 200-OK"); } else { console.log("connection error"); } }; xhr.send(formData); }; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form name="choice_form" id="choice_form" action="/g/choicehandler" method="post" onsubmit="writeToStorage()"&gt; &lt;textarea name="choice" rows="7" cols="50"&gt;&lt;/textarea&gt;&lt;br /&gt; &lt;input type="submit" value="submit your choice"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt;""") </code></pre> <p><strong>UPDATE 2</strong></p> <p>I noticed in the logs that the text from textarea which is "choice" and "chooser" which is sent with xhr are not shown together, one of them is always without a value:</p> <pre><code>INFO ... chooser: user0 choice: INFO ... chooser: choice: abcd INFO ... chooser: user0 choice: INFO ... chooser: choice: efgh </code></pre> <p>This is the code for the above log:</p> <pre><code>chooser = self.request.get("chooser") choice = self.request.get("choice") logging.info("chooser: %s choice: %s" % tuple([chooser, choice])) new_choice = User( choice = choice, owner = chooser) new_choice.put() </code></pre> <p>so in the datastore i see "chooser" and "choice" written in 2 different rows. What am I doing wrong? </p>
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    1. COIt is OK as long as the page using this script is also served from localhost:8086
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      1. POCan I test XMLHttpRequest() in SDK with localhost?
      1. USJ. K.
    2. COWhat is 'chooser' supposed to be?
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      1. POCan I test XMLHttpRequest() in SDK with localhost?
      1. USDaniel Roseman
    3. COAre you sure `user` has a value in your javascript? Have you tried replacing it with a string literal for testing?
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      1. POCan I test XMLHttpRequest() in SDK with localhost?
      1. USNick Johnson
 

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