Can I access Page Data on footer / header function ?

[amrutraj]

Can I know in advance (before the actual pdf is generated), the contents of the page.

e.g. I have 100 lines of data in a table. first 60 are printed on page 1 & rest on page 2. Is there a way to get the summary data of any page on that particular footer.

For page footers,

footer: function(currentPage, pageCount, pageSize) {
        return { text: currentPage.toString() + ' of ' + pageCount, alignment: 'center' }
}, 

Can I do something like,

footer: function(currentPage, pageCount, pageSize, pageData) {
      // calculations on pageData.
        return { text: "PAGE Summary = "+ someSummaryStaistics }
}, 

[naxmefy]

hmm i dont think so - but can't you get summaries before you start creating the pdf?

u may also access the definition object inside the callback function. E.g.:

use the following in the playground

// playground requires you to assign document definition to a variable called dd

var tableData = tableDataGenerator(365)
tableData.unshift(['#', 'Date', 'Income'])

var dd = {
	content: [
	    {
	        layout: 'lightHorizontalLines',
	        table: {
				widths: [50, 100, '*'],
				headerRows: 1,
				body: tableData
			}
	    }
	],
	footer: function (current, count) {
	    // console.log(current, count)
	    // seems there is currently no sepecfic selector
	    // may use of style value? here via index
	    var tableObject = dd.content[0]; 
	    
	    // console.log(tableObject.table)
	    // you have a positions object now
	    // console.log(tableObject.positions)
	    // this position is also available inside the table body
	    
	    // select the body and interate over columns 
	    // (dont forget exlcude the headerRow)
	    var pageSummary = 0;
	    for(var index = 1; index < tableObject.table.body.length; index++) {
	        var row = tableObject.table.body[index];
	        var col = row[2]
	        
	        // possible positon
	        // var position = tableObject.positions[index]
	        // we take it from col
	        console.log(col) 
	        if (current == col.positions[0].pageNumber) {
	            pageSummary += parseInt(col.text)
	        }
	    }
	    
	    return {text: 'Page Summary: ' + pageSummary}  
	}
}

function tableDataGenerator(days) {
    var data = []
    var date = new Date('2018-01-01')
    var income = 1
    var incomeIncrement = 0
    
    for(var i = 0; i < days; i++) {
        data.push([i+1, date.toLocaleDateString(), income])
        date.setDate(date.getDate() + 1)
        income += incomeIncrement
    }
    
    return data
}

UPDATE
you have to verify that you got the correct summary if the row breaks over the page

[liborm85]

Feature request is here: #1199