Find whether a Tag is present in between two tags or not

[ArunB]

Suppose I have two tags <Date> and <Time> as below:

<Date>
    <Value>2008-07-07</Value>
</Date>
<TestTag>
    TestTag Text Node
</TestTag>
<Time>
    <Value>20:15:45</Value>
</Time>

How can I find whether TestTag is present in between the <Date> and <Time> tags or not?

The <TestTag> may present any where in the document. But I want to know whether it is present between <Date> and <Time> tags or not?

[SoulScratch]

getElementsByTagName('date'), loop through all the Date elements and then inside of that check for getElementsByTagName('testtag') (length property)

[ArunB]

TestTag is not present in Date Tag...

[JimmyP]

Something like this should work:

var TestTag = document.getElementsByTagName('TestTag');
for ( var i = 0 ; i < TestTag.length ; ++i ) {
    var next = (TestTag[i].nextSibling.nodeName=='#text') ? TestTag[i].nextSibling.nextSibling : TestTag[i].nextSibling;
    var previous = (TestTag[i].previousSibling.nodeName=='#text') ? TestTag[i].previousSibling.previousSibling : TestTag[i].previousSibling;
    if(next.nodeName=='Time'&&previous.nodeName=='Date') {
        alert('TestTag is present between date and time')
    }
}

[ArunB]

Thanks.

But TestTag is not the only tag that exists between Date and Time tags. in this case, what should I do?

[JimmyP]

hmmm... You'd have to take a walk through the DOM in both directions. Tricky...

OR you could get the whole DOM into a string and then test it somehow to determine whether your pattern is there.

Getting the whole DOM:

function showDOM(){
var s = document.getElementsByTagName('*');
var str = '';
for(var i=0;i<s.length;i++)
str+=s[i].nodeName+'<br>';
return;
}

[M-M-J]

If they are all in the same nest level just loop through the parent element, save the number of each, then check if the number of testtag is bigger than the number of Date and smaller than Time.

edit; example:

var i = 0
 ,els = document.getElementsByTagName('parent').getElementsByTagName('*')
 ,l = els.length
 ,nodeN
 ,date
 ,testtag
 ,time;
 
for ( ; i < l; i++){
	nodeN = els[i].nodeName
	if (nodeN == "Date")
		date = i;
	if (nodeN == "TestTag")
		testtag = i;
	if (nodeN == "Time")
		time = i;
}
if (testtag > date && testtag < time)
	//do the do

[ArunB]

Is there any easy way using jQuery?

[M-M-J]

Is there any easy way using jQuery?

Its all JavaScript, all jQuery would do is facilitate the DOM retriaval.

There might be a way to check this with XPath, however I could easily be wrong as XPath is yet to be explored by me.