evaluateJavaScript
evaluateJavaScript(str)
Evaluate a function contained in a string.
evaluateJavaScript evaluates the function defined in the string in the context of the web page. It is similar to evaluate.
Examples
Set a variable and log it from the web page
This example passes a constant value from phantomjs to the window object in the context of the web page, and then logs that value.
var webPage = require('webpage');
var page = webPage.create();
page.onConsoleMessage = function(msg) {
console.log('The web page said: ' + msg);
};
page.open('http://phantomjs.org/', function(status) {
var script1 = "function(){ window.phantomVar='phantomjs made me do it!'; }";
var script2 = "function(){ console.log(window.phantomVar); }";
page.evaluateJavaScript(script1);
page.evaluateJavaScript(script2);
phantom.exit();
});
Notice that str must contain the text of a function declaration. The declared function is invoked immediately.
If you try to use it simply to define a variable like this. it won’t work.
page.evaluateJavaScript("window.phantomVar='phantomjs made me do it!';"); /*wrong*/
If you try this you’ll get an error message like this:
SyntaxError: Expected token ')'
phantomjs://webpage.evaluate():1 in evaluateJavaScript
Extract the phantomjs.org website’s logo url
var webPage = require('webpage');
var page = webPage.create();
page.onConsoleMessage = function(msg) {
console.log('CONSOLE: ' + msg);
};
page.open('http://phantomjs.org/', function(status) {
var logoUrl = page.evaluateJavaScript('function(){return document.body.querySelector("img").src;}');
console.log(logoUrl); // http://phantomjs.org/img/phantomjs-logo.png
phantom.exit();
});