blocks|key|2332324|text|++++page.evaluate(function+()+{
++++++++document.getElementById("login").click();
++++});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2332325|有用吗..。不是你的意思？|unstyled|2332326|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> page.evaluate(function () {
 document.getElementById("login").click();
 });
</code></pre>

does work... Not what you mean?

blocks|key|2332345|text|PhantomJS有两个上下文。只有通过page.evaluate()访问的页面上下文才能访问DOM，并且可以触发合成事件。因为您的click()函数使用document，所以它需要在页面上下文中运行。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2332346|page.evaluate()是沙箱化的，这就是为什么不能简单地使用外部定义的变量。您要么需要在页面上下文中定义它们，要么需要以一种复杂的方式传递它们(因为只有原始对象可以传入和输出页面上下文，而函数不是原始对象)。|2332347|page.open(url,+function(status)+{
++++page.evaluate(function()+{
++++++++if+(typeof+window.click+!==+"function")+{
++++++++++++window.click+=+function(el){
++++++++++++++++var+ev+=+document.createEvent('MouseEvent');
++++++++++++++++ev.initMouseEvent(
++++++++++++++++++++'click',
++++++++++++++++++++true+/*+bubble+*/,+true+/*+cancelable+*/,
++++++++++++++++++++window,+null,
++++++++++++++++++++0,+0,+0,+0,+/*+coordinates+*/
++++++++++++++++++++false,+false,+false,+false,+/*+modifier+keys+*/
++++++++++++++++++++0+/*left*/,+null
++++++++++++++++);
++++++++++++++++el.dispatchEvent(ev);
++++++++++++}
++++++++}
++++++++var+obj+=+document.querySelectorAll('button')[0];
++++++++click(obj);
++++});
++++console.log(page.content);
++++phantom.exit();
});|code-block|syntax|javascript|2332348|参考文献：|2332349|page.evaluate()文档|unordered-list-item|2332350|在PhantomJS：Q:+PhantomJS;+click+an+element中“单击”的方法|2332351|entityMap|0|LINK|mutability|MUTABLE|url|http://phantomjs.org/api/webpage/method/evaluate.html|1|https://stackoverflow.com/q/15739263/1816580^0|K|F|1U|7|25|8|0|0|F|0|0|0|0|F|0|F|0|0|B|U|1|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1E|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1F|8|@$9|1G|A|1H|B|C]]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|R|3|S|5|Q|7|1L|8|@]|D|@$9|1M|A|1N|1|1O]]|E|$]]|$1|T|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10]]|11|$5|W|X|Y|E|$Z|12]]]]

PhantomJS has two context. Only the page context, accessed through <code>page.evaluate()</code>, has access to the DOM and can trigger synthetic events. Since your <code>click()</code> function uses <code>document</code>, it needs to be run in the page context.

<code>page.evaluate()</code> is sandboxed, which is why you can't simply use variables that are defined outside. You either need to define them in the page context or you need to pass them in in a complicated manner (because only primitive objects can be pass into and out of the page context and functions are not primitive objects).

<pre><code>page.open(url, function(status) {
 page.evaluate(function() {
 if (typeof window.click !== "function") {
 window.click = function(el){
 var ev = document.createEvent('MouseEvent');
 ev.initMouseEvent(
 'click',
 true /* bubble */, true /* cancelable */,
 window, null,
 0, 0, 0, 0, /* coordinates */
 false, false, false, false, /* modifier keys */
 0 /*left*/, null
 );
 el.dispatchEvent(ev);
 }
 }
 var obj = document.querySelectorAll('button')[0];
 click(obj);
 });
 console.log(page.content);
 phantom.exit();
});
</code></pre>

References:

<ul>
<li>Documentation of <a href="http://phantomjs.org/api/webpage/method/evaluate.html" rel="nofollow noreferrer"><code>page.evaluate()</code></a></li>
<li>Ways to "click" in PhantomJS: <a href="https://stackoverflow.com/q/15739263/1816580">Q: PhantomJS; click an element</a></li>
</ul>

blocks|key|2332371|text|我解决了问题。这个点击被网站的javascript绕过了。幸运的是，PhantomJS有一个sendEvent函数，它与实际用户发送事件的方式相同：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2332372|var+rect+=+page.evaluate(function()+{
++++return+$('a.whatever')[0].getBoundingClientRect();
});
page.sendEvent('click',+rect.left+%2B+rect.width+/+2,+rect.top+%2B+rect.height+/+2);|code-block|syntax|javascript|2332373|通过PhantomJS;+click+an+element找到上述解决方案|offset|length|2332374|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/15739263/phantomjs-click-an-element/24026636#24026636^0|0|0|2|R|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I figured out the problem. The click was being circumvented by the site's javascript. Luckily PhantomJS has a sendEvent function that sends the event the same as a real user would:

<pre><code>var rect = page.evaluate(function() {
 return $('a.whatever')[0].getBoundingClientRect();
});
page.sendEvent('click', rect.left + rect.width / 2, rect.top + rect.height / 2);
</code></pre>

Found above solution via <a href="https://stackoverflow.com/questions/15739263/phantomjs-click-an-element/24026636#24026636">PhantomJS; click an element</a>

From post: <a href="https://stackoverflow.com/questions/25554797/how-to-ng-click-an-a-directive-in-a-phantomjs-test?lq=1">How to ng-click an A directive in a PhantomJS test</a> I understand I need to create my own function to click an element, but how do I use it?

The following code gives me error <code>TypeError: 'undefined' is not a function (evaluating 'click(obj)')</code>

<pre><code>var page = require('webpage').create();
var url = 'http://somesite.com/document.html';

page.open(url, function(status) {
 page.evaluate(function() {
 var obj = document.querySelectorAll('button')[0];
 click(obj);
 });
 console.log(page.content);
 phantom.exit();
});


function click(el){
 var ev = document.createEvent('MouseEvent');
 ev.initMouseEvent(
 'click',
 true /* bubble */, true /* cancelable */,
 window, null,
 0, 0, 0, 0, /* coordinates */
 false, false, false, false, /* modifier keys */
 0 /*left*/, null
 );
 el.dispatchEvent(ev);
}
</code></pre>

Cannot click element with Phantomjs

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在post：中，我知道我需要创建自己的函数来单击一个元素，但是如何使用它呢？下面的代码给出了错误TypeError: 'undefined' is not a function (evaluating 'click(obj)')var page = require('webpage').create();var url...

问无法使用Phantomjs单击元素
EN

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