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kamome
Asked: 2020-03-17 04:10:21 +0800 CST 2020-03-17 04:10:21 +0800 CST

How to iterate through an array with the for loop in jsPDF?

  • 772

I loop through a list to print to a PDF using jsPDF:

for (i = 0; i <= SRUreport.lista_wps().length; i++) {
    valor_imprimir = (i+'   : '+Ejemplolista[i])[0].trim());
    doc.text(20,100,valor_imprimir);
    alert(valor_imprimir);
}

it alertworks correctly, and it throws me the values ​​of Ejemplolistain pop-up windows.

However, if I use the same variable ( valor_imprimir) to include it in a PDF using jsPFD it throws me the following error:

Uncaught TypeError: Cannot read property '0' of undefined

Why doesn't it recognize the value [0]that belongs to the first string of the array Ejemplolista?

javascript

1 Answers

  1. Best Answer

    As rnd comments if there is an element in the list that is undefined, you will get the error:

    Uncaught TypeError: Cannot read property '< >' of undefined.

    Although you comment that you can correctly print the values ​​it has Ejemplolista, the problem in this case seems to me to be because you don't need the [0]in this line of code:

    valor_imprimir = (i+'   : '+Ejemplolista[i])[0].trim());

    deals only with (you also have an unnecessary parenthesis):

      valor_imprimir = (i+'   : '+Ejemplolista[i]).trim();

    Another important detail that could cause a bug (indexoutofbounds) is that the number of elements in SRUreport.lista_wps().length;can be greater or less than the elements inside:Ejemplolista

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