1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
/**
* A factory to generate FormLike objects that represent a set of related fields
* which aren't necessarily marked up with a <form> element. FormLike's emulate
* the properties of an HTMLFormElement which are relevant to form tasks.
*/
export let FormLikeFactory = {
_propsFromForm: ["action", "autocomplete", "ownerDocument"],
/**
* Create a FormLike object from a <form>.
*
* @param {HTMLFormElement} aForm
* @return {FormLike}
* @throws Error if aForm isn't an HTMLFormElement
*/
createFromForm(aForm) {
if (!HTMLFormElement.isInstance(aForm)) {
throw new Error("createFromForm: aForm must be a HTMLFormElement");
}
let formLike = {
elements: [...aForm.elements],
rootElement: aForm,
};
for (let prop of this._propsFromForm) {
formLike[prop] = aForm[prop];
}
this._addToJSONProperty(formLike);
return formLike;
},
/**
* Create a FormLike object from an <input>/<select> in a document.
*
* If the field is in a <form>, construct the FormLike from the form.
* Otherwise, create a FormLike with a rootElement (wrapper) according to
* heuristics. Currently all <input>/<select> not in a <form> are one FormLike
* but this shouldn't be relied upon as the heuristics may change to detect
* multiple "forms" (e.g. registration and login) on one page with a <form>.
*
* Note that two FormLikes created from the same field won't return the same FormLike object.
* Use the `rootElement` property on the FormLike as a key instead.
*
* @param {HTMLInputElement|HTMLSelectElement} aField - an <input> or <select> field in a document
* @return {FormLike}
* @throws Error if aField isn't a password or username field in a document
*/
createFromField(aField) {
if (
(!HTMLInputElement.isInstance(aField) &&
!HTMLSelectElement.isInstance(aField)) ||
!aField.ownerDocument
) {
throw new Error("createFromField requires a field in a document");
}
let rootElement = this.findRootForField(aField);
if (HTMLFormElement.isInstance(rootElement)) {
return this.createFromForm(rootElement);
}
let doc = aField.ownerDocument;
let formLike = {
action: doc.baseURI,
autocomplete: "on",
ownerDocument: doc,
rootElement,
};
// FormLikes can be created when fields are inserted into the DOM. When
// many, many fields are inserted one after the other, we create many
// FormLikes, and computing the elements list becomes more and more
// expensive. Making the elements list lazy means that it'll only
// be computed when it's eventually needed (if ever).
XPCOMUtils.defineLazyGetter(formLike, "elements", function() {
let elements = [];
for (let el of this.rootElement.querySelectorAll("input, select")) {
// Exclude elements inside the rootElement that are already in a <form> as
// they will be handled by their own FormLike.
if (!el.form) {
elements.push(el);
}
}
return elements;
});
this._addToJSONProperty(formLike);
return formLike;
},
/**
* Find the closest <form> if any when aField is inside a ShadowRoot.
*
* @param {HTMLInputElement} aField - a password or username field in a document
* @return {HTMLFormElement|null}
*/
closestFormIgnoringShadowRoots(aField) {
let form = aField.closest("form");
let current = aField;
while (!form) {
let shadowRoot = current.getRootNode();
if (!ShadowRoot.isInstance(shadowRoot)) {
break;
}
let host = shadowRoot.host;
form = host.closest("form");
current = host;
}
return form;
},
/**
* Determine the Element that encapsulates the related fields. For example, if
* a page contains a login form and a checkout form which are "submitted"
* separately, and the username field is passed in, ideally this would return
* an ancestor Element of the username and password fields which doesn't
* include any of the checkout fields.
*
* @param {HTMLInputElement|HTMLSelectElement} aField - a field in a document
* @return {HTMLElement} - the root element surrounding related fields
*/
findRootForField(aField) {
let form = aField.form || this.closestFormIgnoringShadowRoots(aField);
if (form) {
return form;
}
return aField.ownerDocument.documentElement;
},
/**
* Add a `toJSON` property to a FormLike so logging which ends up going
* through dump doesn't include usless garbage from DOM objects.
*/
_addToJSONProperty(aFormLike) {
function prettyElementOutput(aElement) {
let idText = aElement.id ? "#" + aElement.id : "";
let classText = "";
for (let className of aElement.classList) {
classText += "." + className;
}
return `<${aElement.nodeName + idText + classText}>`;
}
Object.defineProperty(aFormLike, "toJSON", {
value: () => {
let cleansed = {};
for (let key of Object.keys(aFormLike)) {
let value = aFormLike[key];
let cleansedValue = value;
switch (key) {
case "elements": {
cleansedValue = [];
for (let element of value) {
cleansedValue.push(prettyElementOutput(element));
}
break;
}
case "ownerDocument": {
cleansedValue = {
location: {
href: value.location.href,
},
};
break;
}
case "rootElement": {
cleansedValue = prettyElementOutput(value);
break;
}
}
cleansed[key] = cleansedValue;
}
return cleansed;
},
});
},
};
|
