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gaia/shared/js/html_imports.js

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+/* exported HtmlImports */
+'use strict';
+
+/**
+ * This file is included when we encounter lazy loaded nodes
+ * in DEBUG mode.
+ */
+var HtmlImports = {
+  /**
+   * Populates all custom component nodes
+   * Populates nodes with comments, which are then
+   * parsed by lazy_loader
+   */
+  populate: function(callback) {
+    var imports = document.querySelectorAll('link[rel="import"]');
+    if (!imports.length) {
+      return;
+    }
+
+    var pending = imports.length;
+
+    Array.prototype.forEach.call(imports, function perImport(eachImport) {
+      this.getImportContent(eachImport.href, function gotContent(content) {
+        // Mapping of all custom element templates
+        var elementTemplates = {};
+        var elementRoot = document.createElement('div');
+        elementRoot.innerHTML = content;
+        var elements = elementRoot.querySelectorAll('element');
+
+        for (var i = 0, iLen = elements.length; i < iLen; i++) {
+          var element = elements[i];
+          var template = element.querySelector('template');
+          elementTemplates[element.getAttribute('name')] = template.innerHTML;
+        }
+
+        var replaceableElements = document.querySelectorAll('*[is]');
+        Array.prototype.forEach.call(replaceableElements, function _each(el) {
+          if (elementTemplates[el.getAttribute('is')]) {
+            el.innerHTML = elementTemplates[el.getAttribute('is')];
+            el.removeAttribute('is');
+          }
+        });
+        if (!(--pending)) {
+          callback();
+        }
+      });
+    }, this);
+  },
+
+  getImportContent: function(path, callback) {
+    // bail out if the imported resource isn't in the same origin
+    var parsedURL = new URL(path, location.href);
+    if (parsedURL.origin !== location.origin) { return; }
+    var xhr = new XMLHttpRequest();
+    xhr.onload = function(o) {
+      callback(xhr.responseText);
+    };
+    xhr.open('GET', path, true);
+    xhr.send();
+  }
+};
+