Menu
I have html page with many rows (is about 40000)
<html><body>
<table id="t1">
<tr id="r1" name="1"><td>row 1</td></tr>
<tr id="r2" name="1"><td>row 2</td></tr>
....
<tr id="r50000" name="3"><td>row 30000</td></tr>
</table></body></html>
I need a fast way to hide/show set of rows (10 000 or 20 000) with the specified name. Platform requirements: IE8-9 and Mozila Firefox. I tray many methods: using tbody, block tags, hiding rows, and stop at one: loop trow the rows and hide/show it:
curLevel=root.getAttribute("Name");
var nextElement=curElement.nextElementSibling;
while(nextElement!=null)
{
curElement=nextElement;
nextElement=curElement.nextElementSibling;
if(curElement.tagName=="TR")
{
i++;
childLevel=curElement.getAttribute("Name");
if(childLevel<=curLevel)
break;
curElement.style.display = blockStyle;
}
}
But this method is very slow!! Takes is about 2 minutes...
Loop goes fast, the slowest part is curElement.style.display = blockStyle; it repaints document every time.
Could I change display style for selection rows and then show changes?
P.S. without jQuery
883
asked Feb 19 '26 07:02
Probably the fastest way is to use a CSS rule, either by adding and removing a rule, or modifying one. Since the rows you wish to hide have a common name, you can use the equivalent of the following to hide the rows with a name of "1":
tr[name="1"]{
display: none;
}
and remove the rule to show them. The following shows how to do that.
// Object to hold functions for adding and removeing style rules
var myStyles = (function() {
// Use the first style sheet for convenience
var sheet = document.styleSheets[0];
// Delete a rule from sheet based on the selector
function deleteRule(selector) {
// Get rules
var rules = sheet.rules || sheet.cssRules; // Cover W3C and IE models
// Search for rule and delete if found
for (var i=0, iLen=rules.length; i<iLen; i++) {
if (selector == rules[i].selectorText) {
sheet.deleteRule(i);
}
}
}
// Add a rule to sheet given a selector and CSS text
function addRule(selector, text) {
// First delete the rule if it exists
deleteRule(selector);
// Then add it
sheet.insertRule(selector + text);
}
// Return object with methods
return {
'addRule': addRule,
'deleteRule': deleteRule
};
}());
// Convenience functions to hide and show rows
function hideRows(){
myStyles.addRule('tr[name="1"]','{display: none}');
}
function showRows(){
myStyles.deleteRule('tr[name="1"]');
}
Alternative behaviours for the addRule function if a rule with the selector already exists are:
Some play HTML:
<table>
<tr name="1"><td>name is 1
<tr name="1"><td>name is 1
<tr name="1"><td>name is 1
<tr name="1"><td>name is 1
<tr name="2"><td>name is 2
<tr name="2"><td>name is 2
<tr name="2"><td>name is 2
<tr name="2"><td>name is 2
</table>
<button onclick="hideRows()">Hide rows named 1</button>
<button onclick="showRows()">Show rows named 1</button>
Clicking on the first button hides all rows with a name of "1" by adding a CSS rule, clicking the other button shows them by removing the rule.
Of course you can make it much more sophisticated, the above just shows the method.
173
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
