Why doesn’t this.evaluate return DOM nodes correctly?

by

It makes sense, because elmnt.options in the last snippet is an array full with undefined values. So you know the number of elements, but not their values. The reason is that DOM nodes cannot be passed from page context. The docs say:

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!

So either you do everything inside of the page context (evaluate) or you get a representation of the DOM nodes that you want to work with. Which I think is not what you want.

var elmnt = this.evaluate(function () {
    return [].map.call(document.getElementsByName("symbol")[0].options, function(option){
        return {text: option.innerText, value: option.value};
    });
});

More Related Contents:

  1. CasperJS/PhantomJS doesn’t load https page
  2. CasperJS bind issue
  3. How do I access an iframe from CasperJS?
  4. How to login into a website with CasperJS?
  5. phantomjs not waiting for “full” page load
  6. PhantomJS; click an element
  7. How can I scrape pages with dynamic content using node.js?
  8. Pass arguments with page.evaluate
  9. How to submit a form using PhantomJS
  10. How to scroll down with Phantomjs to load dynamic content
  11. Save and render a webpage with PhantomJS and node.js
  12. How to render part of a page with PhantomJS?
  13. how to wait for element visibility in phantomjs
  14. How to open a new tab in CasperJS
  15. Phantomjs page.content isn’t retrieving the page content
  16. save html output of page after execution of the page’s javascript
  17. how to Execute PhantomJS from PHP
  18. can phantomjs work with node.js?
  19. Using PhantomJS to embed all images of a webpage produces warnings but works
  20. Using Multiple page.open in Single Script
  21. Looping over urls to do the same thing
  22. What must be wrapped in then() statements in CasperJS? How to determine execution order of sync/async functions?
  23. console.log doesn’t work in CasperJS’ evaluate with setTimeout
  24. How to download a csv file using PhantomJS
  25. Phantom JS synchronous AJAX request : NETWORK_ERR: XMLHttpRequest Exception 101
  26. How do you send images to node js with Axios?
  27. What is the meaning of polyfills in HTML5?
  28. onsubmit multiple javascript functions
  29. How to calculate rotation angle from rectangle points?
  30. converting a javascript string to a html object [duplicate]

Leave a Comment