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PONoSuchElementException with unknown cause using Selenium
 

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    <p>While writing selenium testcases for a webapplication I'm having trouble with the xpath selector. The element of the HTML-code which should be clicked on by Selenium is the following:</p> <pre><code>&lt;a title="Voeg een vak toe" href="#" onclick="javascript:$.colorbox({width:818,href:'/olo-cleanjump/profiel/addVakForm'}); return false;"&gt; &lt;p class="add"&gt; &lt;img class="add-icon" src="/olo-cleanjump/static/images/icon_add.png"/&gt; Voeg vak toe &lt;/p&gt; &lt;/a&gt; </code></pre> <p>The Selenium IDE plugin for firefox gives me the following selenium code for this:</p> <pre><code>driver.findElement(By.cssSelector("p.add")).click(); </code></pre> <p>The addVakForm javascript function that is called by this link opens a colorbox with the following HTML (I shortened it, there are around 30 similar div's with class "lesboek_popup") inside:</p> <pre><code>&lt;div id="cboxLoadedContent" style="display: block; width: 776px; overflow: auto; height: 653px;"&gt; &lt;div id="profielpagina_add"&gt; &lt;h2&gt;Voeg een vak toe aan je profiel&lt;/h2&gt; &lt;div class="lesboek_popup"&gt; &lt;a class="content" href="/olo-cleanjump/profiel/addvak/120776"&gt; &lt;img src="" alt=""&gt; &lt;/a&gt; &lt;p class="caption"&gt; &lt;a href="/olo-cleanjump/profiel/addvak/120776"&gt;Engels&lt;/a&gt; &lt;/p&gt; &lt;/div&gt; &lt;div class="lesboek_popup"&gt; &lt;a class="content" href="/olo-cleanjump/profiel/addvak/120786"&gt; &lt;img src="" alt=""&gt; &lt;/a&gt; &lt;p class="caption"&gt; &lt;a href="/olo-cleanjump/profiel/addvak/120786"&gt;Biologie&lt;/a&gt; &lt;/p&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>For the test I want to open the 'Biologie' link. Selenium IDE got me the following selenium code to do this</p> <pre><code>driver.findElement(By.xpath("//div[@id='profielpagina_add']/div[20]/a")).click(); </code></pre> <p>to select this biology link element. Based on this I wrote the following testcase:</p> <pre><code> Test public void testAddRemoveVak() throws Exception { this.get(""); // vak 1 toevoegen driver.findElement(By.cssSelector("p.add")).click(); driver.findElement(By.xpath("//div[@id='profielpagina_add']/div[20]/a")).click(); // vak 2 toevoegen driver.findElement(By.cssSelector("p.add")).click(); driver.findElement(By.xpath("//div[@id='profielpagina_add']/div[20]/a")).click(); assertEquals(driver.findElements(By.xpath("//li[@class='vak']")).size(), 2); // vak 2 verwijderen this.get("profiel/removevak/120791"); assertEquals(driver.findElements(By.xpath("//li[@class='vak']")).size(), 1); } </code></pre> <p>The part</p> <pre><code>driver.findElement(By.cssSelector("p.add")).click(); </code></pre> <p>actually was successful, so after this call the colorbox should be loaded. However the</p> <pre><code>driver.findElement(By.xpath("//div[@id='profielpagina_add']/div[20]/a")).click(); </code></pre> <p>causes an NoSuchElementException, while this element definitely is present in the colorbox when I check for myself (the call/xpath was even autogenerated by Selenium IDE). Does anyone have a clue what may cause the NoSuchElementException?</p>
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