Added javascript injector for logging into zabbix

javascript-injectors/README.md

@@ -220,3 +220,10 @@ $ screenly asset inject-js "$ASSET_ID" "$JAVASCRIPT_URL"
 
 * Download [cyfe-sign-in-via-credentials.js](https://github.com/Screenly/Playground/tree/master/javascript-injectors/examples/cyfe-sign-in-via-credentials.js) and modify it with your credentials.
 * Run `screenly asset inject-js "$ASSET_ID" /path/to/script.js` to add the JavaScript
+
+## Sign in to Zabbix via credentials
+
+<img src="../images/zabbix-logo.png" alt="Zabbix logo" width="150"/>
+
+* Download [zabbix-login-via-credentials.js](https://github.com/Screenly/Playground/tree/master/javascript-injectors/examples/zabbix-login-via-credentials.js) and modify it with your credentials.
+* Run `screenly asset inject-js "$ASSET_ID" /path/to/script.js` to add the JavaScript

javascript-injectors/examples/zabbix-login-via-credentials.js

@@ -0,0 +1,31 @@
+(function () {
+  const username = '<YOUR_USERNAME>'
+  const password = '<YOUR PASSWORD>'
+
+  const authLocation = '/index.php'
+
+  function setValue (selector, value) {
+    const element = document.querySelector(selector)
+    element.value = value
+    element.dispatchEvent(new Event('change'))
+  }
+
+  function submitForm () {
+    document.querySelector('button[value="Sign in"]').click()
+  }
+
+  function login () {
+    try {
+      setValue('input[name="name"]', username)
+      setValue('input[name="password"]', password)
+      submitForm()
+    } catch (error) {
+      console.warn(error)
+      setTimeout(login, 3000)
+    }
+  }
+
+  if (window.location.pathname === authLocation) {
+    login()
+  }
+})()