-
Notifications
You must be signed in to change notification settings - Fork 45.5k
/
ReactInputSelection.js
194 lines (174 loc) · 5.67 KB
/
ReactInputSelection.js
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
194
/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import getActiveElement from './getActiveElement';
import {getOffsets, setOffsets} from './ReactDOMSelection';
import {ELEMENT_NODE, TEXT_NODE} from './HTMLNodeType';
function isTextNode(node) {
return node && node.nodeType === TEXT_NODE;
}
function containsNode(outerNode, innerNode) {
if (!outerNode || !innerNode) {
return false;
} else if (outerNode === innerNode) {
return true;
} else if (isTextNode(outerNode)) {
return false;
} else if (isTextNode(innerNode)) {
return containsNode(outerNode, innerNode.parentNode);
} else if ('contains' in outerNode) {
return outerNode.contains(innerNode);
} else if (outerNode.compareDocumentPosition) {
return !!(outerNode.compareDocumentPosition(innerNode) & 16);
} else {
return false;
}
}
function isInDocument(node) {
return (
node &&
node.ownerDocument &&
containsNode(node.ownerDocument.documentElement, node)
);
}
function isSameOriginFrame(iframe) {
try {
// Accessing the contentDocument of a HTMLIframeElement can cause the browser
// to throw, e.g. if it has a cross-origin src attribute.
// Safari will show an error in the console when the access results in "Blocked a frame with origin". e.g:
// iframe.contentDocument.defaultView;
// A safety way is to access one of the cross origin properties: Window or Location
// Which might result in "SecurityError" DOM Exception and it is compatible to Safari.
// https://html.spec.whatwg.org/multipage/browsers.html#integration-with-idl
return typeof iframe.contentWindow.location.href === 'string';
} catch (err) {
return false;
}
}
function getActiveElementDeep() {
let win = window;
let element = getActiveElement();
while (element instanceof win.HTMLIFrameElement) {
if (isSameOriginFrame(element)) {
win = element.contentWindow;
} else {
return element;
}
element = getActiveElement(win.document);
}
return element;
}
/**
* @ReactInputSelection: React input selection module. Based on Selection.js,
* but modified to be suitable for react and has a couple of bug fixes (doesn't
* assume buttons have range selections allowed).
* Input selection module for React.
*/
/**
* @hasSelectionCapabilities: we get the element types that support selection
* from https://html.spec.whatwg.org/#do-not-apply, looking at `selectionStart`
* and `selectionEnd` rows.
*/
export function hasSelectionCapabilities(elem) {
const nodeName = elem && elem.nodeName && elem.nodeName.toLowerCase();
return (
nodeName &&
((nodeName === 'input' &&
(elem.type === 'text' ||
elem.type === 'search' ||
elem.type === 'tel' ||
elem.type === 'url' ||
elem.type === 'password')) ||
nodeName === 'textarea' ||
elem.contentEditable === 'true')
);
}
export function getSelectionInformation() {
const focusedElem = getActiveElementDeep();
return {
focusedElem: focusedElem,
selectionRange: hasSelectionCapabilities(focusedElem)
? getSelection(focusedElem)
: null,
};
}
/**
* @restoreSelection: If any selection information was potentially lost,
* restore it. This is useful when performing operations that could remove dom
* nodes and place them back in, resulting in focus being lost.
*/
export function restoreSelection(priorSelectionInformation) {
const curFocusedElem = getActiveElementDeep();
const priorFocusedElem = priorSelectionInformation.focusedElem;
const priorSelectionRange = priorSelectionInformation.selectionRange;
if (curFocusedElem !== priorFocusedElem && isInDocument(priorFocusedElem)) {
if (
priorSelectionRange !== null &&
hasSelectionCapabilities(priorFocusedElem)
) {
setSelection(priorFocusedElem, priorSelectionRange);
}
// Focusing a node can change the scroll position, which is undesirable
const ancestors = [];
let ancestor = priorFocusedElem;
while ((ancestor = ancestor.parentNode)) {
if (ancestor.nodeType === ELEMENT_NODE) {
ancestors.push({
element: ancestor,
left: ancestor.scrollLeft,
top: ancestor.scrollTop,
});
}
}
if (typeof priorFocusedElem.focus === 'function') {
priorFocusedElem.focus();
}
for (let i = 0; i < ancestors.length; i++) {
const info = ancestors[i];
info.element.scrollLeft = info.left;
info.element.scrollTop = info.top;
}
}
}
/**
* @getSelection: Gets the selection bounds of a focused textarea, input or
* contentEditable node.
* -@input: Look up selection bounds of this input
* -@return {start: selectionStart, end: selectionEnd}
*/
export function getSelection(input) {
let selection;
if ('selectionStart' in input) {
// Modern browser with input or textarea.
selection = {
start: input.selectionStart,
end: input.selectionEnd,
};
} else {
// Content editable or old IE textarea.
selection = getOffsets(input);
}
return selection || {start: 0, end: 0};
}
/**
* @setSelection: Sets the selection bounds of a textarea or input and focuses
* the input.
* -@input Set selection bounds of this input or textarea
* -@offsets Object of same form that is returned from get*
*/
export function setSelection(input, offsets) {
const start = offsets.start;
let end = offsets.end;
if (end === undefined) {
end = start;
}
if ('selectionStart' in input) {
input.selectionStart = start;
input.selectionEnd = Math.min(end, input.value.length);
} else {
setOffsets(input, offsets);
}
}