Run chrome extension and submit data to PHP script on page load (automate the process)

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 1  2014

I am first time using chrome extension for web crawling. I get data in HTML popup and then submits it to PHP script on button click. Now I want to do this functionality on page

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执念已碎

2021-01-25 02:31

Use the background page

In your manifest, change your current "background" key with:

"background": { "page" : "background.html", "persistent": true}

and your "content_scripts" key with:

"content_scripts": [{"matches":"the_URLs_you_want_to_scrape", "js" : ["content.js"], "run_at": "document_idle"}]

This will be background.html:

<html>
  <body>
    <form id=myForm>
      <input type="text" name="name" id="name">
      <input type="text" name="address" id="address">
      <input type="text" name="reg_date" id="reg_date">
      <input type="text" name="legal_form" id="legal_form">
    </form>
    <script src="background.js"></script>
  </body>
</html>

In your background.js file include this:

chrome.runtime.onMessage.addListener(function(message){
  if (message.from == "cs") {
    document.getElementById("name").value = message.name;
    document.getElementById("address").value = message.address;
    document.getElementById("reg_date").value = message.reg_date;
    document.getElementById("legal_form").value = message.legal_form;

    var encodedData = [].reduce.call(document.getElementById("myForm").elements, function(acc,cur){
      acc.push(cur.name+"="+encodeURIComponent(cur.value));return acc},[]).join("&");

    var xhr = new XMLHttpRequest();
    xhr.onload = function(){
      //check the response
    }
    xhr.open("POST",your_link_to_PHP_script);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.send(encodedData);
  }
});

Then your content.js will directly be:

var myMessage = {
  from: "cs",
  name : document.querySelector('ul.companyDetails li:nth-child(1) > br').nextSibling.nodeValue.trim(),
  address : document.querySelector('ul.companyDetails li:nth-child(2) > br').nextSibling.nodeValue.trim() + " "
                  + document.querySelectorAll('ul.companyDetails li:nth-child(2) > br')[1].nextSibling.nodeValue.trim(),
  reg_date : document.querySelector('ul.companyDetails li:nth-child(3) > br').nextSibling.nodeValue.trim(),
  legal_form : document.querySelector('ul.companyDetails li:nth-child(4) > br').nextSibling.nodeValue.trim()
};

chrome.runtime.sendMessage(myMessage);

Bonus: you don't need JQuery :)

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