google extension inline install and Verified not working - google-chrome-extension

Question

google.com/webstore i have add my extension
i Have check "This item uses inline install."
Websites: chose Verify site
google.com/webmasters i have add site and Verifyed.
when i put this code on me site:
<link rel="chrome-webstore-item"href="https://chrome.google.com/webstore/detail/itemID">
<button onclick="chrome.webstore.install()" id="install-button">Add to Chrome</button>
<script>
if (document.getElementById('extension-is-installed')) {
document.getElementById('install-button').style.display = 'none';
}
</script>
i click on button "Add to Chrome" install app extension, but when i refresh site button "Add to Chrome" is display. why? i cant Understanding

Answer 1

You're obviously following the guide at https://developer.chrome.com/webstore/inline_installation
In that case, you missed a step.. Let's look at the code.
if (document.getElementById('extension-is-installed')) {
document.getElementById('install-button').style.display = 'none';
}
The condition here is whether an element with ID extension-is-installed is present on the page. But what adds it?
A step back:
For example, you could have a content script that targets the installation page:
var isInstalledNode = document.createElement('div');
isInstalledNode.id = 'extension-is-installed';
document.body.appendChild(isInstalledNode);
So, you need to add a Content Script that adds that element to the page.
However, I doubt that guide will work. By default, content scripts execute after DOM is loaded (and therefore, that hiding script has executed). You can make them run at document_start, but then body does not exist yet.
Let me make an alternative hiding script, based on communicating with the extension using "externally_connectable". Suppose your website is example.com, and your extension's ID is itemID
Add example.com to sites you want to be messaged from:
"externally_connectable" : {
"matches" : [
"*://*.example.com/*"
]
},
In your background page, prepare for the message from the webpage:
chrome.runtime.onMessageExternal.addListener(
function(message, sender, sendResponse) {
if(message.areYouThere) sendResponse(true);
}
);
In your page at example.com, add a button (hidden by default) and code to show it when appropriate:
<button onclick="chrome.webstore.install()"
id="install-button" style="display:none;">
Add to Chrome
</button>
<script>
if (chrome) {
// The browser is Chrome, so we may need to show the button
if(chrome.runtime && chrome.runtime.sendMessage) {
// Some extension is ready to receive messages from us
// Test it:
chrome.runtime.sendMessage(
"itemID",
{areYouThere: true},
function(response) {
if(response) {
// Extension is already installed, keep hidden
} else {
// No positive answer - it wasn't our extension
document.getElementById('install-button').style.display = 'block';
}
}
);
} else {
// Extension is not installed, show button
document.getElementById('install-button').style.display = 'block';
}
}
</script>
Was requested to add page reload after install. chrome.webstore.install has a callback parameter specifically for this.
Instead of using onclick attribute, assign a function:
document.getElementById('install-button').addEventListener("click", function(e) {
chrome.webstore.install(function() {
// Installation successful
location.reload();
});
});