如何在javascript中设置时间间隔

Question

I am using html5 and javascript..i have some code in which i am reading some value from excel file ..here is the code

 var xVal = 1;
 var yVal = 2

 function readdata(x,y) {
    x = xVal;
    y = yVal;
    try {
       var excel = new ActiveXObject("Excel.Application");
       excel.Visible = false;
       var excel_file = excel.Workbooks.Open("D:\\Test.xls");
       //alert(excel_file.worksheets.count);
       var excel_sheet = excel_file.Worksheets("Sheet1");

   for(i=0;i<5;i++)
   {
        var data = excel_sheet.Cells(i,2).Value;
        drawWithexcelValue(data);
       }        
}
catch (ex) {
    alert(ex);
}         

this is my code to read excel file ...while i am running it gives an error Expected";"..i dont know where do i keep the ;

We have for loop to evaluate next value ...i want to know that how to give time interval between every execution , say it will stop for particular time before taking next value..and secondly i am hardcoding the value i<5; ..i want to know that is there any function through which i can read full excel file ...

Answer 1

How are you defining "full file"? Excel has very large number of possible rows, I think what you want is a loop that ends when you hit an empty row.

while(1) {
   var data = excel_sheet.Cells(i,2).Value;
   if(data === ''){ // or undefined?
        break;
    } else {
       drawWithexcelValue(data);
    }
}

Answer 2

You have not said what line creates the error, but the specific error message you receive suggests this line:

var yVal = 2

which is missing a semi-colon at the end. JavaScript statements are semi-colon terminated. This would not usually create an error though, unless you are using use strict .

You can investigate JavaScript's setInterval to create the delay(s).. once you've got the current code working.