Passing Parameters to Content Scripts Injected with chrome.tabs.executeScript()
When injecting a content script file using chrome.tabs.executeScript({file: "content.js"}), a common question arises: how to pass parameters to the JavaScript within the content script file?
Parameter Passing Fallacy
It's important to clarify that you cannot directly pass parameters to a file. Instead, you have two options for achieving this functionality:
1. Setting Parameters Before File Execution
Nest chrome.tabs.executeScript calls to define variables before injecting the file:
<code class="javascript">chrome.tabs.executeScript(tab.id, { code: 'var config = 1;' }, function() { chrome.tabs.executeScript(tab.id, {file: 'content.js'}); });</code>
For complex variables, consider using JSON.stringify to convert an object into a string:
<code class="javascript">var config = {somebigobject: 'complicated value'}; chrome.tabs.executeScript(tab.id, { code: 'var config = ' + JSON.stringify(config) }, function() { chrome.tabs.executeScript(tab.id, {file: 'content.js'}); });</code>
In content.js, you can access these variables:
<code class="javascript">// content.js alert('Example:' + config);</code>
2. Setting Parameters After File Execution
Execute the file first, then use the message passing API to send parameters:
<code class="javascript">chrome.tabs.executeScript(tab.id, {file: 'content.js'}, function() { chrome.tabs.sendMessage(tab.id, 'whatever value; String, object, whatever'); });</code>
In content.js, listen for these messages using chrome.runtime.onMessage and handle the message:
<code class="javascript">chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) { // Handle message. // In this example, message === 'whatever value; String, object, whatever' });</code>
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