Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Making Changes to the DOM Getting and Setting Text with textContent and innerHTML

Vijayalaxmi vastrad
Vijayalaxmi vastrad
2,789 Points
Posted by Vijayalaxmi vastrad
Vijayalaxmi vastrad
2,789 Points

Uncaught TypeError: Cannot set property 'innerHTML' of null

//html <div class="time">last time: <div class="date" style="display:inline-block; margin-right:.7rem;"> <span id="date"></span> <span id="month"></span> <span id="year"></span> </div> <div class="time" style="display:inline-block"> <span id="hours"></span> <span id="minutes"></span> <span id="seconds"></span> </div> </div> ///js window.onload= function(){ clock();

function clock() {
    const fullDate = new Date();
    var day = fullDate.getDate();
    var month = fullDate.getMonth();
    var year = fullDate.getFullYear();
    var hour = fullDate.getHours();
    var minutes = fullDate.getMinutes();
    var sec = fullDate.getSeconds();

    if (hour < 10) {
        hour = "0" + hour;
    }
    if (minutes < 10) {
        minutes = "0" + minutes;
    }
    if (sec < 10) {
        sec = "0" + sec;
    }
    if (day < 10) {
        day = "0" + day;
    }
    if (month < 10) {
        month = "0" + month;
    }

    document.getElementById('date').innerHTML=day;
    document.getElementById('month').innerHTML="/" + month;
    document.getElementById('year').innerHTML = "/" + year;

    document.getElementById('hours').innerHTML = hour;
    document.getElementById('minutes').innerHTML = ":" + minutes;
    document.getElementById('seconds').innerHTML = ":" + sec;

}
setInterval(clock, 100);

}

2 Answers

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

This works for me after copy and paste. Is it possible that you accidentally changed the ID of one of the HTML elements?

For example, if the first span had an ID of "dale" instead of "date" I would expect to get that error.

Also, you could use 1000 instead of 100 for the interval and get the same results with 10% of the effort.

Vijayalaxmi vastrad
Vijayalaxmi vastrad
2,789 Points
Vijayalaxmi vastrad
Vijayalaxmi vastrad
2,789 Points

mine sometimes error occurs sometime do not. not getting why. anyway thank you so much