evaluate
evaluate(function, arg1, arg2, ...) {object}
Evaluates the given function in the context of the web page. The execution is sandboxed, the web page has no access to the phantom object and it can’t probe its own setting.
Examples
Get the page title from Bing.com (1)
var webPage = require('webpage');
var page = webPage.create();
page.open('http://m.bing.com', function(status) {
var title = page.evaluate(function() {
return document.title;
});
console.log(title);
phantom.exit();
});
Get the page title from Bing.com (2)
As of PhantomJS 1.6, JSON-serializable arguments can be passed to the function. In the following example, the text value of a DOM element is extracted.
The following example achieves the same end goal as the previous example but the element is chosen based on a selector which is passed to the evaluate call:
page.open('http://m.bing.com', function(status) {
var title = page.evaluate(function(s) {
return document.querySelector(s).innerText;
}, 'title');
console.log(title);
phantom.exit();
});
Note: The arguments and the return value to the evaluate function must be a simple primitive object. The rule of thumb: if it can be serialized via JSON, then it is fine.
Closures, functions, DOM nodes, etc. will not work!
Any console message from a web page, including from the code inside evaluate, will not be displayed by default. To override this behavior, use the onConsoleMessage callback. The first example can be rewritten to:
Get the page title from Bing.com and print it inside evaluate
var webPage = require('webpage');
var page = webPage.create();
page.onConsoleMessage = function(msg) {
console.log(msg);
}
page.open('http://m.bing.com', function(status) {
page.evaluate(function() {
console.log(document.title);
});
phantom.exit();
});