I am using Drupal's Webform module which writes all the ids and classes automatically, so I can't add an Id to the place I want to add it. And Drupal doesn't put one in for me. Grrr.
I have no problem when I use my code with just a simple getElementById('myid'), but the element I need is a blank, no id, no class "a" that's inside a "legend" (which has a class but no id) that's inside a fieldset with an id.
I tried this code and several variations but it didn't work:
document.getElementById('webform-created-id-here').getElementsByTagName('legend').getElementsByTagName('a');
I feel like I'm not understanding how to properly access that part of the DOM. Can anyone offer help or suggestions?
Thank you!
getElementsByTagName return a nodelist with the elements found, so you must select the index of the element
Example for the first element
var test = document.getElementById('webform-created-id-here').getElementsByTagName('legend')[0].getElementsByTagName('a')[0];
Recurse through the DOM yourself. References to the children of any element are stored in the childNodes
attribute which exist for every node.
function recurseDOM (el,test) {
if (test(el)) {
return el;
}
else {
var children = el.childNodes;
var result;
for (var i=0; i<children.length; i+) {
result = recurseDOM(children[i],test);
if (result) {
return result;
}
}
}
return null;
}
This is only one possible implementation that I wrote in the 2 minutes it took me to type out this answer. So it can probably use some improvements. But you get the idea.
Use it like this:
recurseDOM(document.body,function(el){
if (el == something_something) { return 1}
return 0
});
You can write a similar function to test parents:
function testParents (el, test) {
var parent = el.parentNode;
if (test(parent)) {
return 1;
}
else {
if (parent != document.body) {
return testParents(parent,test);
}
}
return 0;
}
So you can write something like:
recurseDOM(document.body,function(el){
if (el.tagName == 'a' && testParents(el,function(p){
if (p.tagName == 'legend' && testParents(p,function(pp){
if (pp.id == 'webform-created-id-here') {
return 1;
}
return 0;
})) {
return 1;
}
return 0;
})) {
return 1;
}
return 0;
});
Alternatively, you can start the recursion form the getElementById
instead of document.body
.
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