title: CasperJS navigation requested on every step with injected script
body: <p>I have recently started using CasperJS to test a piece of JavaScript that inserts a button and does some AJAX requests on a page. What I am seeing with my code that I am not seeing with the examples in the documentation is that it seems like CasperJS is reloading the original page at every step.</p>
  
  <p>This resembles my code:</p>
  
  <pre><code>var casper = require('casper').create({
      clientScripts: ['MyScript.js'],
      verbose: true,
      logLevel: "debug"
  });
  
  casper.on('remote.message', function(msg) {
      this.log('Remote console message: ' + msg, 'warning');
  });
  
  casper.userAgent('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.116 Safari/537.36');
  
  casper.start('http://www.wikipedia.org');
  
  casper.then(function(){
      if (this.exists('div#my_btn')){
          this.click('#my_btn');
          this.capture('wikipedia.png', undefined, {
              format: 'jpg',
              quality: 75
          });
          this.waitFor(function check() {
              return this.evaluate(function() {
                  return this.getHTML('div#my_btn_status').length &gt; 0;
              }, function then() {
                  this.echo('Key: ' + this.getHTML('div#my_btn_status'));
              });
          });
      } else {
          this.log('My btn not here', 'error');
      }
  });
  
  casper.run();
  </code></pre>
  
  <p>These are the logs I get back:</p>
  
  <pre><code>[info] [phantom] Starting...
  [info] [phantom] Running suite: 3 steps
  [debug] [phantom] opening url: http://www.wikipedia.org/, HTTP GET
  [debug] [phantom] Navigation requested: url=http://www.wikipedia.org/, type=Other, willNavigate=true, isMainFrame=true
  [debug] [phantom] url changed to "http://www.wikipedia.org/"
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [debug] [phantom] Successfully injected Casper client-side utilities
  [debug] [phantom] start page is loaded
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [info] [phantom] Step anonymous 3/3 http://www.wikipedia.org/ (HTTP 200)
  [debug] [phantom] Mouse event 'mousedown' on selector: #my_btn
  [debug] [phantom] Mouse event 'mouseup' on selector: #my_btn
  [debug] [phantom] Mouse event 'click' on selector: #my_btn
  [debug] [phantom] Capturing page to /Users/Me/Documents/Casper/wikipedia.png
  [info] [phantom] Capture saved to /Users/Me/Documents/Casper/wikipedia.png
  [info] [phantom] Step anonymous 3/3: done in 845ms.
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [info] [phantom] Step _step 4/4 http://www.wikipedia.org/ (HTTP 200)
  [info] [phantom] Step _step 4/4: done in 919ms.
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  ... (The above two lines get repeated a ton)
  [debug] [phantom] Navigation requested: url=about:blank, type=Other, willNavigate=true, isMainFrame=false
  [debug] [phantom] Automatically injected MyScript.js client side
  [warning] [phantom] Casper.waitFor() timeout
  [error] [phantom] Wait timeout of 5000ms expired, exiting.
  Wait timeout of 5000ms expired, exiting.
  </code></pre>
  
  <p>When <strong>#my_btn</strong> is clicked, MyScript.js performs an AJAX request which updates <strong>#my_btn_status</strong>. </p>
  
  <p>As you can see, it seems that the page keeps reloading and MyScript.js keeps getting injected, thus I am never able to see the contents of <strong>#my_btn_status</strong> because the state of <strong>#my_btn</strong> keeps getting reset on page load. </p>
  
  <p>I am running the script with this command: </p>
  
  <pre><code>casperjs --ignore-ssl-errors=true casper_test.js
  </code></pre>
  
  <p>EDIT: I've thought about this further, and I think it might be useful to know that MyScript.js also injects an iframe into the page, in addition to #my_btn. Is it possible that casperjs keeps injecting MyScript.js into every child iframe which would explain the url=about:blank, isMainFrame=false?</p>