Passing Razor Variable into JavaScript Function

Question

I am working on an Auction site in Asp.net MVC and I am trying to be able to display how a timer of how much time is left on each item's auction. I pass a list of items to my cshtml page with my Model and then iterate through them like so:

My javascript function to start timer:

function countdown(time) {
    // Get todays date and time
    var now = new Date().getTime();

    // Find the distance between now an the count down date
    var distance = time - now;

    // Time calculations for days, hours, minutes and seconds
    var days = Math.floor(distance / (1000 * 60 * 60 * 24));
    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);

    // Display the result in the element with id="timeLeft"
    document.getElementById("timeLeft").innerHTML = days + "d " + hours + "h "
        + minutes + "m " + seconds + "s ";

}, 1000);

Then my iterator of my Model, calling js function with the item's end date

@foreach (var item in Model)
    {
        //code here
        countdown(@item.EndDate)
        <text id="timeLeft"></text>
    }

I have my script referenced by <script src="~/Scripts/countdown.js" />

The problem I am having is how to call this js function with ac# razor variable. Doing something basic for one item like:

<body onload= "countdown('@item.EndDate')">

When I put my razor variable it greys out my function. How do I need to go about passing my variable into my js function?
EX: (with singular Model item)

Answer 1

Try with this syntax:

@foreach (var item in Model)
{
    //code here
    countdown(`${@item.EndDate}`)
}

Answer 2

If you want to make a timer in javascript, I would use window.setInterval function, then set the second parameter to be time interval.

This function countdown need to pass three parameter

End Year
End Month
End Day

  function countdown(endYear,endMonth,endDay) { window.setInterval(function () { StartCount(endYear, endMonth, endDay, 'andy timer'); }, 1000); } function StartCount(endYear,endMonth,endDay){ var now=new Date(); var endDate=new Date(endYear,endMonth-1,endDay); var leftTime=endDate.getTime() - now.getTime(); var leftSecond=parseInt(leftTime/1000); var day=Math.floor(leftSecond/(60*60*24)); var hour=Math.floor((leftSecond-day*24*60*60)/3600); var minute=Math.floor((leftSecond - day * 24 * 60 * 60 - hour * 3600) / 60); var second = Math.floor(leftSecond - day * 24 * 60 * 60 - hour * 3600 - minute * 60); document.getElementById("timeLeft").innerHTML = day + "d " + hour + "h " + minute + "m " + second + "s "; } countdown(2018,10,5)

 <div id='timeLeft'></div>

You can use this on the body tag

<body onload= "countdown(@Model.EndDate.Year,@Model.EndDate.Month,@Model.EndDate.Day)">

EDIT

It worked on c# MVC online: https://dotnetfiddle.net/ERcwAb

Answer 3

I figured out a crazy way to do what I was trying to do, might not be efficient, might be a sin to the entire coding community, but here it is:

@foreach (var item in Model)
{
    <script>
    function countdown(endYear, endMonth, endDay, endHours, endMin, num) {
        window.setInterval(function () { StartCount(endYear, endMonth, endDay, endHours, endMin, num); }, 1000);
    }

    function StartCount(endYear, endMonth, endDay, endHours, endMin, num) {
        var now = new Date();
        var endDate = new Date(endYear, endMonth - 1, endDay, endHours, endMin);

        var leftTime = endDate.getTime() - now.getTime();

        var leftSecond = parseInt(leftTime / 1000);

        var day = Math.floor(leftSecond / (60 * 60 * 24));

        var hour = Math.floor((leftSecond - day * 24 * 60 * 60) / 3600);

        var minute = Math.floor((leftSecond - day * 24 * 60 * 60 - hour * 3600) / 60);

        var second = Math.floor(leftSecond - day * 24 * 60 * 60 - hour * 3600 - minute * 60);

        var id = "timeLeft" + num;

        document.getElementById(id).innerHTML = day + "d " + hour + "h "
      + minute + "m " + second + "s ";
    }
    countdown(@item.EndDate.Year, @item.EndDate.Month, @item.EndDate.Day,@item.EndDate.Hour, @item.EndDate.Minute, @num)
    </script>

    @{string countNum = "timeLeft" + num;}
     <text id= @countNum></text>
     @{num++;}
     //code
}

But it still loads asynchronously where the items will all load, then the clocks all appear a second later and all content is moved accordingly. May be due to my initial issue of not doing able to call body onload.

Passing Razor Variable into JavaScript Function

Question

3 answers

solution1
2 2018-07-05 19:54:20

solution2
1 2018-07-05 20:15:01

solution3
0 ACCPTED 2018-07-06 16:30:13

Passing Razor Variable into JavaScript Function

Question

3 answers

solution1 2 2018-07-05 19:54:20

solution2 1 2018-07-05 20:15:01

solution3 0 ACCPTED 2018-07-06 16:30:13

solution1
2 2018-07-05 19:54:20

solution2
1 2018-07-05 20:15:01

solution3
0 ACCPTED 2018-07-06 16:30:13