Some tips on using JS to operate page tables and elements_Basic knowledge

(one)
IE, Firefox and other browsers have different operations on table tags. In IE, innerHTML assignment of table and tr is not allowed. When using js to add a tr, the appendChile method does not work. Here are the results of my tests on three browsers:

insertRow

IE6: Supported, and the default parameter is -1, which is added to the end by default

FireFox: Supported, but does not support default parameters

Opera: supports, supports default parameters, and is added to the front by default


AppendChild

IE6: Not supported

FireFox: Supported, but adding TR will not affect ROWS

Opera: Support, the effect is the same as insertRow(-1), affects ROWS

Follow the specifications to the maximum extent and you will be able to write safe and adaptable code:

//Append an empty row to the table:
var otr = otable.insertRow(-1);
var otd = document.createElement("td");
otd.innerHTML = " ";
otd.className = "XXXX";
otr.appendChild(otd);

This way it can run on these three browsers
(3) Operation of childNodes
(1)Attribute nodeName
Utils.getChildrenByTagName = function (node, tagName) {
var ln = node.childNodes.length;
var arr = [];
for (var z = 0; z if (node.childNodes[z].nodeName == tagName) {
arr.push(node.childNodes[z]);
}
}
return arr;
};
(2)Attribute id
function getNodeID(parent, id) {
var ln = parent.childNodes.length;
for (var z = 0; z if (parent.childNodes[z].id == id) {
                                      return parent.childNodes[z];
}
}
return null;
}
(3)Attribute className
corresponds to class, such as

function getElementsByClassName(node, className) {
var children = node.getElementsByTagName("*");
var elements = new Array();
for (var i = 0; i var child = children[i];
var classNames = child.className.split(" ");
for (var j = 0; j if (classNames[j] == className) {
elements.push(child);
break;
}
}
}
return elements;
}