ASP.Net TreeView Expand/Collapse All does not work when node icons are present
I've used the following js code to expand/collapse all nodes of an ASP.Net TreeView control:
// handle tree - this doesn't seem to work when the tree contains node images
function TreeviewExpandCollapseAll(treeViewId, expandAll) {
var displayState = (expandAll == true ? "none" : "block");
var treeView = document.getElementById(treeViewId);
if (treeView) {
var开发者_如何学Go treeLinks = treeView.getElementsByTagName("a");
var nodeCount = treeLinks.length;
alert(nodeCount);
for (i = 0; i < nodeCount; i++) {
if (treeLinks[i].firstChild.tagName) {
if (treeLinks[i].firstChild.tagName.toLowerCase() == "img") {
var currentToggleLink = treeLinks[i];
var childContainer = GetParentByTagName("table", currentToggleLink).nextSibling;
if (childContainer.style.display == displayState) {
eval(currentToggleLink.href);
}
}
}
} //for loop ends
}
}
//utility function to get the container of an element by tagname
function GetParentByTagName(parentTagName, childElementObj) {
var parent = childElementObj.parentNode;
while (parent.tagName.toLowerCase() != parentTagName.toLowerCase()) {
parent = parent.parentNode;
}
return parent;
}
The problem is that when I have NodeStyle-ImageUrl="img/FolderSmall.gif" , it the expanding fails after opening the first child node - ONLY when there are node images present.
The JS error is childContainer is null:
if (childContainer.style.display == displayState) {
eval(currentToggleLink.href);
I'm sure someone else has run into this, but all the code I've found for expand/collapse fails at the same point.
This is really from a while back, but if I recall correctly, I simply included a 1px image placeholder in order to not return null on any calls.
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