XFA - Convert some template properties into CSS ones (#13082)

- implement few positioning properties: position, width, height, anchor;
  - implement font element;
  - implement fill element (used by font) and its children (linear, radial, ...);
  - font property is inherited from ancestor container (see https://www.pdfa.org/wp-content/uploads/2020/07/XFA-3_3.pdf#page=43) so let CSS handles that stuff;
  - in order to reduce the number of properties to set, only set non default properties and put the default in CSS;
  - set a background to some containers to be able to see them (will be removed in a future commit).
This commit is contained in:
calixteman 2021-03-25 13:02:39 +01:00 committed by GitHub
parent 9d0ce6e79f
commit 63471bcbbe
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10 changed files with 549 additions and 93 deletions

View File

@ -13,57 +13,108 @@
* limitations under the License.
*/
const converters = {
pt: x => x,
cm: x => Math.round((x / 2.54) * 72),
mm: x => Math.round((x / (10 * 2.54)) * 72),
in: x => Math.round(x * 72),
};
import { $toStyle, XFAObject } from "./xfa_object.js";
import { warn } from "../../shared/util.js";
function measureToString(m) {
const conv = converters[m.unit];
if (conv) {
return `${conv(m.value)}px`;
}
return `${m.value}${m.unit}`;
return Number.isInteger(m) ? `${m}px` : `${m.toFixed(2)}px`;
}
function setWidthHeight(node, style) {
if (node.w) {
style.width = measureToString(node.w);
} else {
if (node.maxW && node.maxW.value > 0) {
style.maxWidth = measureToString(node.maxW);
const converters = {
anchorType(node, style) {
if (!("transform" in style)) {
style.transform = "";
}
if (node.minW && node.minW.value > 0) {
style.minWidth = measureToString(node.minW);
switch (node.anchorType) {
case "bottomCenter":
style.transform += "translate(-50%, -100%)";
break;
case "bottomLeft":
style.transform += "translate(0,-100%)";
break;
case "bottomRight":
style.transform += "translate(-100%,-100%)";
break;
case "middleCenter":
style.transform += "translate(-50%,-50%)";
break;
case "middleLeft":
style.transform += "translate(0,-50%)";
break;
case "middleRight":
style.transform += "translate(-100%,-50%)";
break;
case "topCenter":
style.transform += "translate(-50%,0)";
break;
case "topRight":
style.transform += "translate(-100%,0)";
break;
}
},
dimensions(node, style) {
if (node.w) {
style.width = measureToString(node.w);
} else {
if (node.maxW && node.maxW.value > 0) {
style.maxWidth = measureToString(node.maxW);
}
if (node.minW && node.minW.value > 0) {
style.minWidth = measureToString(node.minW);
}
}
}
if (node.h) {
style.height = measureToString(node.h);
} else {
if (node.maxH && node.maxH.value > 0) {
style.maxHeight = measureToString(node.maxH);
if (node.h) {
style.height = measureToString(node.h);
} else {
if (node.maxH && node.maxH.value > 0) {
style.maxHeight = measureToString(node.maxH);
}
if (node.minH && node.minH.value > 0) {
style.minHeight = measureToString(node.minH);
}
}
if (node.minH && node.minH.value > 0) {
style.minHeight = measureToString(node.minH);
},
position(node, style) {
if (node.x !== "" || node.y !== "") {
style.position = "absolute";
style.left = measureToString(node.x);
style.top = measureToString(node.y);
}
},
rotate(node, style) {
if (node.rotate) {
if (!("transform" in style)) {
style.transform = "";
}
style.transform += `rotate(-${node.rotate}deg)`;
style.transformOrigin = "top left";
}
},
};
function toStyle(node, ...names) {
const style = Object.create(null);
for (const name of names) {
const value = node[name];
if (value === null) {
continue;
}
if (value instanceof XFAObject) {
const newStyle = value[$toStyle]();
if (newStyle) {
Object.assign(style, newStyle);
} else {
warn(`(DEBUG) - XFA - style for ${name} not implemented yet`);
}
continue;
}
if (converters.hasOwnProperty(name)) {
converters[name](node, style);
}
}
return style;
}
function setPosition(node, style) {
style.transform = "";
if (node.rotate) {
style.transform = `rotate(-${node.rotate}deg) `;
style.transformOrigin = "top left";
}
if (node.x !== "" || node.y !== "") {
style.position = "absolute";
style.left = node.x ? measureToString(node.x) : "0pt";
style.top = node.y ? measureToString(node.y) : "0pt";
}
}
export { measureToString, setPosition, setWidthHeight };
export { measureToString, toStyle };

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@ -30,6 +30,7 @@ import {
$setSetAttributes,
$setValue,
$toHTML,
$toStyle,
$uid,
ContentObject,
Option01,
@ -50,8 +51,8 @@ import {
getRelevant,
getStringOption,
} from "./utils.js";
import { measureToString, setPosition, setWidthHeight } from "./html_utils.js";
import { warn } from "../../shared/util.js";
import { measureToString, toStyle } from "./html_utils.js";
import { Util, warn } from "../../shared/util.js";
const TEMPLATE_NS_ID = NamespaceIds.template.id;
@ -614,6 +615,10 @@ class Color extends XFAObject {
[$hasSettableValue]() {
return false;
}
[$toStyle]() {
return Util.makeHexColor(this.value.r, this.value.g, this.value.b);
}
}
class Comb extends XFAObject {
@ -680,7 +685,7 @@ class ContentArea extends XFAObject {
children: [],
attributes: {
style,
className: "xfa-contentarea",
class: "xfaContentarea",
id: this[$uid],
},
};
@ -896,10 +901,10 @@ class Draw extends XFAObject {
"invisible",
]);
this.relevant = getRelevant(attributes.relevant);
this.rotate = getFloat({
this.rotate = getInteger({
data: attributes.rotate,
defaultValue: 0,
validate: x => true,
validate: x => x % 90 === 0,
});
this.use = attributes.use || "";
this.usehref = attributes.usehref || "";
@ -924,6 +929,38 @@ class Draw extends XFAObject {
[$setValue](value) {
_setValue(this, value);
}
[$toHTML]() {
if (!this.value) {
return null;
}
const style = toStyle(
this,
"font",
"dimensions",
"position",
"rotate",
"anchorType"
);
const clazz = ["xfaDraw"];
if (this.font) {
clazz.push("xfaFont");
}
const attributes = {
style,
id: this[$uid],
class: clazz.join(" "),
};
return {
name: "div",
attributes,
children: [],
};
}
}
class Edge extends XFAObject {
@ -1269,6 +1306,31 @@ class ExclGroup extends XFAObject {
field.value[$setValue](nodeBoolean);
}
}
[$toHTML]() {
if (!this.value) {
return null;
}
const style = toStyle(this, "dimensions", "position", "anchorType");
const attributes = {
style,
id: this[$uid],
class: "xfaExclgroup",
};
const children = this[$childrenToHTML]({
// TODO: exObject & exclGroup
filter: new Set(["field"]),
include: true,
});
return {
name: "div",
attributes,
children,
};
}
}
class Execute extends XFAObject {
@ -1360,7 +1422,11 @@ class Field extends XFAObject {
"invisible",
]);
this.relevant = getRelevant(attributes.relevant);
this.rotate = getStringOption(attributes.rotate, ["0", "angle"]);
this.rotate = getInteger({
data: attributes.rotate,
defaultValue: 0,
validate: x => x % 90 === 0,
});
this.use = attributes.use || "";
this.usehref = attributes.usehref || "";
this.w = getMeasurement(attributes.w);
@ -1394,6 +1460,38 @@ class Field extends XFAObject {
[$setValue](value) {
_setValue(this, value);
}
[$toHTML]() {
if (!this.value) {
return null;
}
const style = toStyle(
this,
"font",
"dimensions",
"position",
"rotate",
"anchorType"
);
const clazz = ["xfaField"];
if (this.font) {
clazz.push("xfaFont");
}
const attributes = {
style,
id: this[$uid],
class: clazz.join(" "),
};
return {
name: "div",
attributes,
children: [],
};
}
}
class Fill extends XFAObject {
@ -1418,6 +1516,26 @@ class Fill extends XFAObject {
this.solid = null;
this.stipple = null;
}
[$toStyle]() {
let fill = "#000000";
for (const name of Object.getOwnPropertyNames(this)) {
if (name === "extras" || name === "color") {
continue;
}
const obj = this[name];
if (!(obj instanceof XFAObject)) {
continue;
}
fill = obj[$toStyle](this.color);
break;
}
return {
color: fill,
};
}
}
class Filter extends XFAObject {
@ -1522,6 +1640,80 @@ class Font extends XFAObject {
this.extras = null;
this.fill = null;
}
[$toStyle]() {
const style = toStyle(this, "fill");
if (style.color) {
if (!style.color.startsWith("#")) {
// We've a gradient which is not possible for a font color
// so use a workaround.
style.backgroundClip = "text";
style.background = style.color;
style.color = "transparent";
} else if (style.color === "#000000") {
delete style.color;
}
}
if (this.baselineShift) {
style.verticalAlign = measureToString(this.baselineShift);
}
// TODO: fontHorizontalScale
// TODO: fontVerticalScale
if (this.kerningMode !== "none") {
style.fontKerning = "normal";
}
if (this.letterSpacing) {
style.letterSpacing = measureToString(this.letterSpacing);
}
if (this.lineThrough !== 0) {
style.textDecoration = "line-through";
if (this.lineThrough === 2) {
style.textDecorationStyle = "double";
}
}
// TODO: lineThroughPeriod
if (this.overline !== 0) {
style.textDecoration = "overline";
if (this.overline === 2) {
style.textDecorationStyle = "double";
}
}
// TODO: overlinePeriod
if (this.posture !== "normal") {
style.fontStyle = this.posture;
}
const fontSize = measureToString(this.size);
if (fontSize !== "10px") {
style.fontSize = fontSize;
}
style.fontFamily = this.typeface;
if (this.underline !== 0) {
style.textDecoration = "underline";
if (this.underline === 2) {
style.textDecorationStyle = "double";
}
}
// TODO: underlinePeriod
if (this.weight !== "normal") {
style.fontWeight = this.weight;
}
return style;
}
}
class Format extends XFAObject {
@ -1755,6 +1947,13 @@ class Linear extends XFAObject {
this.color = null;
this.extras = null;
}
[$toStyle](startColor) {
startColor = startColor ? startColor[$toStyle]() : "#FFFFFF";
const transf = this.type.replace(/([RBLT])/, " $1").toLowerCase();
const endColor = this.color ? this.color[$toStyle]() : "#000000";
return `linear-gradient(${transf}, ${startColor}, ${endColor})`;
}
}
class LockDocument extends ContentObject {
@ -1989,11 +2188,11 @@ class PageArea extends XFAObject {
// TODO: handle the case where there are several content areas.
const contentArea = children.find(
node => node.attributes.className === "xfa-contentarea"
node => node.attributes.class === "xfaContentarea"
);
const style = Object.create(null);
if (this.medium && this.medium.short.value && this.medium.long.value) {
if (this.medium && this.medium.short && this.medium.long) {
style.width = measureToString(this.medium.short);
style.height = measureToString(this.medium.long);
} else {
@ -2133,6 +2332,32 @@ class Pattern extends XFAObject {
this.color = null;
this.extras = null;
}
[$toStyle](startColor) {
startColor = startColor ? startColor[$toStyle]() : "#FFFFFF";
const endColor = this.color ? this.color[$toStyle]() : "#000000";
const width = 5;
const cmd = "repeating-linear-gradient";
const colors = `${startColor},${startColor} ${width}px,${endColor} ${width}px,${endColor} ${
2 * width
}px`;
switch (this.type) {
case "crossHatch":
return `${cmd}(to top,${colors}) ${cmd}(to right,${colors})`;
case "crossDiagonal":
return `${cmd}(45deg,${colors}) ${cmd}(-45deg,${colors})`;
case "diagonalLeft":
return `${cmd}(45deg,${colors})`;
case "diagonalRight":
return `${cmd}(-45deg,${colors})`;
case "horizontal":
return `${cmd}(to top,${colors})`;
case "vertical":
return `${cmd}(to right,${colors})`;
}
return "";
}
}
class Picture extends StringObject {
@ -2270,6 +2495,16 @@ class Radial extends XFAObject {
this.color = null;
this.extras = null;
}
[$toStyle](startColor) {
startColor = startColor ? startColor[$toStyle]() : "#FFFFFF";
const endColor = this.color ? this.color[$toStyle]() : "#000000";
const colors =
this.type === "toEdge"
? `${startColor},${endColor}`
: `${endColor},${startColor}`;
return `radial-gradient(circle to center, ${colors})`;
}
}
class Reason extends StringObject {
@ -2393,6 +2628,10 @@ class Solid extends XFAObject {
this.usehref = attributes.usehref || "";
this.extras = null;
}
[$toStyle](startColor) {
return startColor ? startColor[$toStyle]() : "#FFFFFF";
}
}
class Speak extends StringObject {
@ -2430,6 +2669,15 @@ class Stipple extends XFAObject {
this.color = null;
this.extras = null;
}
[$toStyle](bgColor) {
const alpha = this.rate / 100;
return Util.makeHexColor(
Math.round(bgColor.value.r * (1 - alpha) + this.value.r * alpha),
Math.round(bgColor.value.g * (1 - alpha) + this.value.g * alpha),
Math.round(bgColor.value.b * (1 - alpha) + this.value.b * alpha)
);
}
}
class Subform extends XFAObject {
@ -2568,17 +2816,16 @@ class Subform extends XFAObject {
page = pageAreas[pageNumber][$toHTML]();
}
const style = Object.create(null);
setWidthHeight(this, style);
setPosition(this, style);
const style = toStyle(this, "dimensions", "position");
const attributes = {
style,
id: this[$uid],
class: "xfaSubform",
};
if (this.name) {
attributes["xfa-name"] = this.name;
attributes.xfaName = this.name;
}
const children = this[$childrenToHTML]({

View File

@ -13,7 +13,13 @@
* limitations under the License.
*/
const measurementPattern = /([+-]?)([0-9]+\.?[0-9]*)(.*)/;
const dimConverters = {
pt: x => x,
cm: x => (x / 2.54) * 72,
mm: x => (x / (10 * 2.54)) * 72,
in: x => x * 72,
};
const measurementPattern = /([+-]?[0-9]+\.?[0-9]*)(.*)/;
function getInteger({ data, defaultValue, validate }) {
if (!data) {
@ -67,15 +73,22 @@ function getMeasurement(str, def = "0") {
if (!match) {
return getMeasurement(def);
}
const [, sign, valueStr, unit] = match;
const [, valueStr, unit] = match;
const value = parseFloat(valueStr);
if (isNaN(value)) {
return getMeasurement(def);
}
return {
value: sign === "-" ? -value : value,
unit: unit || "pt",
};
if (value === 0) {
return 0;
}
const conv = dimConverters[unit];
if (conv) {
return conv(value);
}
return value;
}
function getRatio(data) {
@ -134,7 +147,7 @@ function getColor(data, def = [0, 0, 0]) {
}
function getBBox(data) {
const def = getMeasurement("-1");
const def = -1;
if (!data) {
return { x: def, y: def, width: def, height: def };
}
@ -142,7 +155,7 @@ function getBBox(data) {
.trim()
.split(/\s*,\s*/)
.map(m => getMeasurement(m, "-1"));
if (bbox.length < 4 || bbox[2].value < 0 || bbox[3].value < 0) {
if (bbox.length < 4 || bbox[2] < 0 || bbox[3] < 0) {
return { x: def, y: def, width: def, height: def };
}

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@ -59,6 +59,7 @@ const $setSetAttributes = Symbol();
const $setValue = Symbol();
const $text = Symbol();
const $toHTML = Symbol();
const $toStyle = Symbol();
const $uid = Symbol("uid");
const _applyPrototype = Symbol();
@ -259,6 +260,10 @@ class XFAObject {
return dumped;
}
[$toStyle]() {
return null;
}
[$toHTML]() {
return null;
}
@ -839,6 +844,7 @@ export {
$setValue,
$text,
$toHTML,
$toStyle,
$uid,
ContentObject,
IntegerObject,

View File

@ -36,9 +36,13 @@ class XfaLayer {
}
const stack = [[root, -1, rootHtml]];
parameters.div.appendChild(rootHtml);
const rootDiv = parameters.div;
rootDiv.appendChild(rootHtml);
const coeffs = parameters.viewport.transform.join(",");
parameters.div.style.transform = `matrix(${coeffs})`;
rootDiv.style.transform = `matrix(${coeffs})`;
// Set defaults.
rootDiv.setAttribute("class", "xfaLayer xfaFont");
while (stack.length > 0) {
const [parent, i, html] = stack[stack.length - 1];

View File

@ -87,6 +87,7 @@ async function initializePDFJS(callback) {
"pdfjs-test/unit/writer_spec.js",
"pdfjs-test/unit/xfa_formcalc_spec.js",
"pdfjs-test/unit/xfa_parser_spec.js",
"pdfjs-test/unit/xfa_tohtml_spec.js",
"pdfjs-test/unit/xml_spec.js",
].map(function (moduleName) {
// eslint-disable-next-line no-unsanitized/method

View File

@ -81,9 +81,9 @@ describe("XFAParser", function () {
};
const mediumAttributes = {
id: "",
long: { value: 0, unit: "pt" },
long: 0,
orientation: "portrait",
short: { value: 0, unit: "pt" },
short: 0,
stock: "",
trayIn: "auto",
trayOut: "auto",
@ -116,17 +116,17 @@ describe("XFAParser", function () {
allowMacro: 0,
anchorType: "topLeft",
colSpan: 1,
columnWidths: [{ value: 0, unit: "pt" }],
h: { value: 0, unit: "pt" },
columnWidths: [0],
h: 0,
hAlign: "left",
id: "",
layout: "position",
locale: "",
maxH: { value: 0, unit: "pt" },
maxW: { value: 0, unit: "pt" },
maxH: 0,
maxW: 0,
mergeMode: "consumeData",
minH: { value: 0, unit: "pt" },
minW: { value: 0, unit: "pt" },
minH: 0,
minW: 0,
name: "",
presence: "visible",
relevant: [],
@ -134,15 +134,15 @@ describe("XFAParser", function () {
scope: "name",
use: "",
usehref: "",
w: { value: 0, unit: "pt" },
x: { value: 0, unit: "pt" },
y: { value: 0, unit: "pt" },
w: 0,
x: 0,
y: 0,
proto: {
area: {
...attributes,
colSpan: 1,
x: { value: 0, unit: "pt" },
y: { value: -3.14, unit: "in" },
x: 0,
y: -226.08,
relevant: [
{ excluded: true, viewname: "foo" },
{ excluded: false, viewname: "bar" },
@ -162,19 +162,19 @@ describe("XFAParser", function () {
{
...mediumAttributes,
imagingBBox: {
x: { value: 1, unit: "pt" },
y: { value: 2, unit: "in" },
width: { value: 3.4, unit: "cm" },
height: { value: 5.67, unit: "px" },
x: 1,
y: 144,
width: 96.3779527559055,
height: 5.67,
},
},
{
...mediumAttributes,
imagingBBox: {
x: { value: -1, unit: "pt" },
y: { value: -1, unit: "pt" },
width: { value: -1, unit: "pt" },
height: { value: -1, unit: "pt" },
x: -1,
y: -1,
width: -1,
height: -1,
},
},
],
@ -288,7 +288,7 @@ describe("XFAParser", function () {
let font = root.template.subform.field[0].font;
expect(font.typeface).toEqual("Foo");
expect(font.overline).toEqual(0);
expect(font.size).toEqual({ value: 123, unit: "pt" });
expect(font.size).toEqual(123);
expect(font.weight).toEqual("bold");
expect(font.posture).toEqual("italic");
expect(font.fill.color.value).toEqual({ r: 1, g: 2, b: 3 });
@ -297,7 +297,7 @@ describe("XFAParser", function () {
font = root.template.subform.field[1].font;
expect(font.typeface).toEqual("Foo");
expect(font.overline).toEqual(0);
expect(font.size).toEqual({ value: 456, unit: "pt" });
expect(font.size).toEqual(456);
expect(font.weight).toEqual("bold");
expect(font.posture).toEqual("normal");
expect(font.fill.color.value).toEqual({ r: 4, g: 5, b: 6 });
@ -387,7 +387,7 @@ describe("XFAParser", function () {
expect(font.typeface).toEqual("helvetica");
expect(font.overline).toEqual(0);
expect(font.size).toEqual({ value: 31, unit: "pt" });
expect(font.size).toEqual(31);
expect(font.weight).toEqual("normal");
expect(font.posture).toEqual("italic");
expect(font.fill.color.value).toEqual({ r: 7, g: 8, b: 9 });
@ -1005,10 +1005,7 @@ describe("XFAParser", function () {
).toBe("myfont");
expect(
searchNode(form, form, "Id.LastName.font.size")[0][$text]()
).toEqual({
value: 123.4,
unit: "pt",
});
).toEqual(123.4);
expect(
searchNode(form, form, "Id.LastName.assist.toolTip")[0][$dump]()
.$content

View File

@ -0,0 +1,98 @@
/* Copyright 2020 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { XFAFactory } from "../../src/core/xfa/factory.js";
describe("XFAFactory", function () {
describe("toHTML", function () {
it("should convert some basic properties to CSS", function () {
const xml = `
<?xml version="1.0"?>
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/">
<template xmlns="http://www.xfa.org/schema/xfa-template/3.3">
<subform name="root" mergeMode="matchTemplate">
<pageSet>
<pageArea>
<contentArea x="123pt" w="456pt" h="789pt"/>
<medium stock="default" short="456pt" long="789pt"/>
<draw y="1pt" w="11pt" h="22pt" rotate="90" x="2pt">
<font size="7pt" typeface="Arial" baselineShift="2pt">
<fill>
<color value="12,23,34"/>
<solid/>
</fill>
</font>
<value/>
<margin topInset="1pt" bottomInset="2pt" leftInset="3pt" rightInset="4pt"/>
<para spaceAbove="1pt" spaceBelow="2pt" textIndent="3pt" marginLeft="4pt" marginRight="5pt"/>
</draw>
</pageArea>
</pageSet>
<subform name="first">
</subform>
<subform name="second">
</subform>
</subform>
</template>
<xfa:datasets xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">
<xfa:data>
</xfa:data>
</xfa:datasets>
</xdp:xdp>
`;
const factory = new XFAFactory({ "xdp:xdp": xml });
expect(factory.numberPages).toEqual(2);
const page1 = factory.getPage(0);
expect(page1.attributes.style).toEqual({
height: "789px",
width: "456px",
});
expect(page1.children.length).toEqual(2);
const container = page1.children[0];
expect(container.attributes.class).toEqual("xfaContentarea");
expect(container.attributes.style).toEqual({
height: "789px",
width: "456px",
left: "123px",
top: "0px",
position: "absolute",
});
const draw = page1.children[1];
expect(draw.attributes.class).toEqual("xfaDraw xfaFont");
expect(draw.attributes.style).toEqual({
color: "#0c1722",
fontFamily: "Arial",
fontSize: "7px",
height: "22px",
left: "2px",
position: "absolute",
top: "1px",
transform: "rotate(-90deg)",
transformOrigin: "top left",
verticalAlign: "2px",
width: "11px",
});
// draw element must be on each page.
expect(draw.attributes.style).toEqual(
factory.getPage(1).children[1].attributes.style
);
});
});
});

View File

@ -20,3 +20,43 @@
z-index: 200;
transform-origin: 0 0;
}
.xfaLayer * {
color: inherit;
font: inherit;
font-kerning: inherit;
letter-spacing: inherit;
text-decoration: inherit;
vertical-align: inherit;
}
.xfaFont {
color: black;
font-weight: normal;
font-kerning: none;
font-size: 10px;
font-style: normal;
letter-spacing: 0;
text-decoration: none;
vertical-align: 0;
}
.xfaDraw {
z-index: 200;
background-color: #ff000080;
}
.xfaExclgroup {
z-index: 300;
background-color: #0000ff80;
}
.xfaField {
z-index: 300;
background-color: #00ff0080;
}
.xfaSubform {
z-index: 100;
background-color: #ffff0080;
}

View File

@ -57,7 +57,6 @@ class XfaLayerBuilder {
} else {
// Create an xfa layer div and render the form
this.div = document.createElement("div");
this.div.className = "xfaLayer";
this.pageDiv.appendChild(this.div);
parameters.div = this.div;