Hi everyone!

I need to grab the ids of table rows in a dynamically created table. So, I used the following syntax:

var test = document.getElementsByTagName("tr").id;

and then alerted "test", but it doesn't work. Each <tr> has it's own uniquely generated id, so how do I grab these values?

Thanks in advance.

What you're missing here, is that when you create a variable via document.getElementsByTagName("tr"), what you're actually doing is creating an array of items. Note that Elements is plural. To get the id of each tr, you must loop through the array:

var test = document.getElementsByTagName("tr");
for(var i= 0; i<test.length; i++) {
alert(test[i].id);
}

Be sure to either place this as an onload function, or else place the script down at the bottom so it runs after all the HTML is finished loading.