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pagedjs-repeat-table-header
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| class RepeatTableHeadersHandler extends Paged.Handler { | |
| constructor(chunker, polisher, caller) { | |
| super(chunker, polisher, caller) | |
| this.splitTablesRefs = [] | |
| } | |
| afterPageLayout(pageElement, page, breakToken, chunker) { | |
| this.chunker = chunker | |
| this.splitTablesRefs = [] | |
| if (breakToken) { | |
| const node = breakToken.node | |
| const tables = this.findAllAncestors(node, "table") | |
| if (node.tagName === "TABLE") tables.push(node) | |
| if (tables.length > 0) { | |
| this.splitTablesRefs = tables.map(t => t.dataset.ref) | |
| let thead = node.tagName === "THEAD" ? node : this.findFirstAncestor(node, "thead") | |
| if (thead) { | |
| let lastTheadNode = thead.hasChildNodes() ? thead.lastChild : thead | |
| breakToken.node = this.nodeAfter(lastTheadNode, chunker.source) | |
| } | |
| this.hideEmptyTables(pageElement, node) | |
| } | |
| } | |
| } | |
| hideEmptyTables(pageElement, breakTokenNode) { | |
| this.splitTablesRefs.forEach(ref => { | |
| let table = pageElement.querySelector("[data-ref='" + ref + "']") | |
| if (table) { | |
| let sourceBody = table.querySelector("tbody > tr") | |
| if (!sourceBody || this.refEquals(sourceBody.firstElementChild, breakTokenNode)) { | |
| table.style.visibility = "hidden" | |
| table.style.position = "absolute" | |
| let lineSpacer = table.nextSibling | |
| if (lineSpacer) { | |
| lineSpacer.style.visibility = "hidden" | |
| lineSpacer.style.position = "absolute" | |
| } | |
| } | |
| } | |
| }) | |
| } | |
| refEquals(a, b) { | |
| return a && a.dataset && b && b.dataset && a.dataset.ref === b.dataset.ref | |
| } | |
| findFirstAncestor(element, selector) { | |
| while (element.parentNode && element.parentNode.nodeType === 1) { | |
| if (element.parentNode.matches(selector)) return element.parentNode | |
| element = element.parentNode | |
| } | |
| return null | |
| } | |
| findAllAncestors(element, selector) { | |
| const ancestors = [] | |
| while (element.parentNode && element.parentNode.nodeType === 1) { | |
| if (element.parentNode.matches(selector)) ancestors.unshift(element.parentNode) | |
| element = element.parentNode | |
| } | |
| return ancestors | |
| } | |
| layout(rendered, layout) { | |
| this.splitTablesRefs.forEach(ref => { | |
| const renderedTable = rendered.querySelector("[data-ref='" + ref + "']") | |
| if (renderedTable) { | |
| if (!renderedTable.getAttribute("repeated-headers")) { | |
| const sourceTable = this.chunker.source.querySelector("[data-ref='" + ref + "']") | |
| this.repeatColgroup(sourceTable, renderedTable) | |
| this.repeatTHead(sourceTable, renderedTable) | |
| renderedTable.setAttribute("repeated-headers", true) | |
| } | |
| } | |
| }) | |
| } | |
| repeatColgroup(sourceTable, renderedTable) { | |
| let colgroup = sourceTable.querySelectorAll("colgroup") | |
| let firstChild = renderedTable.firstChild | |
| colgroup.forEach((colgroup) => { | |
| let clonedColgroup = colgroup.cloneNode(true) | |
| renderedTable.insertBefore(clonedColgroup, firstChild) | |
| }) | |
| } | |
| repeatTHead(sourceTable, renderedTable) { | |
| let thead = sourceTable.querySelector("thead") | |
| if (thead) { | |
| let clonedThead = thead.cloneNode(true) | |
| renderedTable.insertBefore(clonedThead, renderedTable.firstChild) | |
| } | |
| } | |
| nodeAfter(node, limiter) { | |
| if (limiter && node === limiter) return | |
| let significantNode = this.nextSignificantNode(node) | |
| if (significantNode) return significantNode | |
| if (node.parentNode) { | |
| while ((node = node.parentNode)) { | |
| if (limiter && node === limiter) return | |
| significantNode = this.nextSignificantNode(node) | |
| if (significantNode) return significantNode | |
| } | |
| } | |
| } | |
| nextSignificantNode(sib) { | |
| while ((sib = sib.nextSibling)) { if (!this.isIgnorable(sib)) return sib } | |
| return null | |
| } | |
| isIgnorable(node) { | |
| return ( | |
| (node.nodeType === 8) | |
| || ((node.nodeType === 3) && this.isAllWhitespace(node)) | |
| ) | |
| } | |
| isAllWhitespace(node) { | |
| return !(/[^\t\n\r ]/.test(node.textContent)) | |
| } | |
| } | |
| Paged.registerHandlers(RepeatTableHeadersHandler) |
Thank you
Thank you! For me in the current 0.5.0-beta2 version it wans't working when tables weren't in one specific layout (in code it says table should be parent of the element). So here is the version that looks for tables everywhere (any layout):
class RepeatTableHeadersHandler extends Paged.Handler {
constructor(chunker, polisher, caller) {
super(chunker, polisher, caller)
this.splitTablesRefs = []
}
afterPageLayout(pageElement, page, breakToken, chunker) {
this.chunker = chunker
this.splitTablesRefs = []
// Check all the tables on the current page
const tablesOnPage = pageElement.querySelectorAll("table");
// Check which tables have sources
for (let table of tablesOnPage) {
if (table.dataset.ref) {
const sourceTable = chunker.source.querySelector(`[data-ref='${table.dataset.ref}']`);
if (sourceTable) {
this.splitTablesRefs.push(table.dataset.ref);
}
}
}
if (breakToken) {
const node = breakToken.node
const tables = this.findAllAncestors(node, "table")
if (node.tagName === "TABLE") tables.push(node)
if (tables.length > 0) {
this.splitTablesRefs = tables.map(t => t.dataset.ref)
let thead = node.tagName === "THEAD" ? node : this.findFirstAncestor(node, "thead")
if (thead) {
let lastTheadNode = thead.hasChildNodes() ? thead.lastChild : thead
breakToken.node = this.nodeAfter(lastTheadNode, chunker.source)
}
this.hideEmptyTables(pageElement, node)
}
}
}
hideEmptyTables(pageElement, breakTokenNode) {
this.splitTablesRefs.forEach(ref => {
let table = pageElement.querySelector("[data-ref='" + ref + "']")
if (table) {
let sourceBody = table.querySelector("tbody > tr")
if (!sourceBody || this.refEquals(sourceBody.firstElementChild, breakTokenNode)) {
table.style.visibility = "hidden"
table.style.position = "absolute"
let lineSpacer = table.nextSibling
if (lineSpacer) {
lineSpacer.style.visibility = "hidden"
lineSpacer.style.position = "absolute"
}
}
}
})
}
refEquals(a, b) {
return a && a.dataset && b && b.dataset && a.dataset.ref === b.dataset.ref
}
findFirstAncestor(element, selector) {
while (element.parentNode && element.parentNode.nodeType === 1) {
if (element.parentNode.matches(selector)) return element.parentNode
element = element.parentNode
}
return null
}
findAllAncestors(element, selector) {
const ancestors = []
while (element.parentNode && element.parentNode.nodeType === 1) {
if (element.parentNode.matches(selector)) ancestors.unshift(element.parentNode)
element = element.parentNode
}
return ancestors
}
layout(rendered, layout) {
this.splitTablesRefs.forEach(ref => {
const renderedTable = rendered.querySelector("[data-ref='" + ref + "']")
if (renderedTable) {
if (!renderedTable.getAttribute("repeated-headers")) {
const sourceTable = this.chunker.source.querySelector("[data-ref='" + ref + "']")
this.repeatColgroup(sourceTable, renderedTable)
this.repeatTHead(sourceTable, renderedTable)
renderedTable.setAttribute("repeated-headers", true)
}
}
})
}
repeatColgroup(sourceTable, renderedTable) {
let colgroup = sourceTable.querySelectorAll("colgroup")
let firstChild = renderedTable.firstChild
colgroup.forEach((colgroup) => {
let clonedColgroup = colgroup.cloneNode(true)
renderedTable.insertBefore(clonedColgroup, firstChild)
})
}
repeatTHead(sourceTable, renderedTable) {
let thead = sourceTable.querySelector("thead")
if (thead) {
let clonedThead = thead.cloneNode(true)
renderedTable.insertBefore(clonedThead, renderedTable.firstChild)
}
}
nodeAfter(node, limiter) {
if (limiter && node === limiter) return
let significantNode = this.nextSignificantNode(node)
if (significantNode) return significantNode
if (node.parentNode) {
while ((node = node.parentNode)) {
if (limiter && node === limiter) return
significantNode = this.nextSignificantNode(node)
if (significantNode) return significantNode
}
}
}
nextSignificantNode(sib) {
while ((sib = sib.nextSibling)) { if (!this.isIgnorable(sib)) return sib }
return null
}
isIgnorable(node) {
return (
(node.nodeType === 8)
|| ((node.nodeType === 3) && this.isAllWhitespace(node))
)
}
isAllWhitespace(node) {
return !(/[^\t\n\r ]/.test(node.textContent))
}
}
Paged.registerHandlers(RepeatTableHeadersHandler)
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Works great, thank you!