http://isee.sdu.edu.cn/yuekan/legend/file/select/xiala2.html
这种特效是怎么实现的?
这种特效是怎么实现的?
解决方案 »
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var overOptionCss = "background: highlight; color: highlighttext";
var sizedBorderCss = "2 inset buttonhighlight";var globalSelect; //This is used when calling an unnamed selectbox with onclick="this.PROPERTY"var ie4 = (document.all != null);var q = 0;
function initSelectBox(el) {
copySelected(el);
var size = el.getAttribute("size");// These two lines combined with execution in optionClick() allow you to write:
// onchange="alert(this.options[this.selectedIndex].value)"
el.options = el.children[1].children;
el.selectedIndex = findSelected(el); //Set the index now!
// Some methods that are supported on the real SELECT box
el.remove = new Function("i", "int_remove(this,i)");
el.item = new Function("i", "return this.options[i]");
el.add = new Function("e", "i", "int_add(this, e, i)");
// The real select box let you have lot of options with the same NAME. In that case the item
// needs two arguments. When using DIVs you can't have two with the same NAME (or ID) and
// then there is no need for the second argument
el.options[el.selectedIndex].selected = true; dropdown = el.children[1]; if (size != null) {
if (size > 1) {
el.size = size;
dropdown.style.zIndex = 0;
initSized(el);
}
else {
el.size = 1;
dropdown.style.zIndex = 99;
if (dropdown.offsetHeight > 200) {
dropdown.style.height = "200";
dropdown.style.overflow = "auto";
}
}
}
highlightSelected(el,true);
}function int_remove(el,i) {
if (el.options[i] != null)
el.options[i].outerHTML = "";
}function int_add(el, e, i) {
var html = "<div class='option' noWrap";
if (e.value != null)
html += " value='" + e.value + "'";
if (e.style.cssText != null)
html += " style='" + e.style.cssText + "'";
html += ">";
if (e.text != null)
html += e.text;
html += "</div>" if ((i == null) || (i >= el.options.length))
i = el.options.length-1; el.options[i].insertAdjacentHTML("AfterEnd", html);
}
function initSized(el) {
//alert("initSized -------->");
var h = 0;
el.children[0].style.display = "none"; dropdown = el.children[1];
dropdown.style.visibility = "visible"; if (dropdown.children.length > el.size) {
dropdown.style.overflow = "auto";
for (var i=0; i<el.size; i++) {
h += dropdown.children[i].offsetHeight;
} if (dropdown.style.borderWidth != null) {
dropdown.style.pixelHeight = h + 4; //2 * parseInt(dropdown.style.borderWidth);
} else
dropdown.style.height = h; } dropdown.style.border = sizedBorderCss;
el.style.height = dropdown.style.pixelHeight;
}function copySelected(el) {
var selectedIndex = findSelected(el); selectedCell = el.children[0].rows[0].cells[0];
selectedDiv = el.children[1].children[selectedIndex];
selectedCell.innerHTML = selectedDiv.outerHTML;
}// This function returns the first selected option and resets the rest
// in case some idiot has set more than one to selcted :-)
function findSelected(el) {
var selected = null;
ec = el.children[1].children; //the table is the first child
var ecl = ec.length;
for (var i=0; i<ecl; i++) {
if (ec[i].getAttribute("selected") != null) {
if (selected == null) { // Found first selected
selected = i;
}
else
ec[i].removeAttribute("selected"); //Like I said. Only one selected!
}
}
if (selected == null)
selected = 0; //When starting this is the most logic start value if none is present return selected;
}function toggleDropDown(el) {
if (el.size == 1) {
dropDown = el.children[1];
if (dropDown.style.visibility == "")
dropDown.style.visibility = "hidden";
if (dropDown.style.visibility == "hidden")
showDropDown(dropDown);
else
hideDropDown(dropDown);
}
}function optionClick() {
el = getReal(window.event.srcElement, "className", "option"); if (el.className == "option") {
dropdown = el.parentElement;
selectBox = dropdown.parentElement;
oldSelected = dropdown.children[findSelected(selectBox)] if(oldSelected != el) {
oldSelected.removeAttribute("selected");
el.setAttribute("selected", 1);
selectBox.selectedIndex = findSelected(selectBox);
} if (selectBox.onchange != null) { // This executes the onchange when you chnage the option
if (selectBox.id != "") { // For this to work you need to replace this with an ID or name
eval(selectBox.onchange.replace(/this/g, selectBox.id));
}
else {
globalSelect = selectBox;
eval(selectBox.onchange.replace(/this/g, "globalSelect"));
}
}
if (el.backupCss != null)
el.style.cssText = el.backupCss;
copySelected(selectBox);
toggleDropDown(selectBox);
highlightSelected(selectBox, true);
}
}function optionOver() {
var toEl = getReal(window.event.toElement, "className", "option");
var fromEl = getReal(window.event.fromElement, "className", "option");
if (toEl == fromEl) return;
var el = toEl;
if (el.className == "option") {
if (el.backupCss == null)
el.backupCss = el.style.cssText;
highlightSelected(el.parentElement.parentElement, false);
el.style.cssText = el.backupCss + "; " + overOptionCss;
this.highlighted = true;
}
}function optionOut() {
var toEl = getReal(window.event.toElement, "className", "option");
var fromEl = getReal(window.event.fromElement, "className", "option"); if (fromEl == fromEl.parentElement.children[findSelected(fromEl.parentElement.parentElement)]) {
if (toEl == null)
return;
if (toEl.className != "option")
return;
}
if (toEl != null) {
if (toEl.className != "option") {
if (fromEl.className == "option")
highlightSelected(fromEl.parentElement.parentElement, true);
}
}
if (toEl == fromEl) return;
var el = fromEl; if (el.className == "option") {
if (el.backupCss != null)
el.style.cssText = el.backupCss;
}}function highlightSelected(el,add) {
var selectedIndex = findSelected(el);
selected = el.children[1].children[selectedIndex];
if (add) {
if (selected.backupCss == null)
selected.backupCss = selected.style.cssText;
selected.style.cssText = selected.backupCss + "; " + overOptionCss;
}
else if (!add) {
if (selected.backupCss != null)
selected.style.cssText = selected.backupCss;
}
}function hideShownDropDowns() {
var el = getReal(window.event.srcElement, "className", "select");
var spans = document.all.tags("SPAN");
var selects = new Array();
var index = 0;
for (var i=0; i<spans.length; i++) {
if ((spans[i].className == "select") && (spans[i] != el)) {
dropdown = spans[i].children[1];
if ((spans[i].size == 1) && (dropdown.style.visibility == "visible"))
selects[index++] = dropdown;
}
}
for (var j=0; j<selects.length; j++) {
hideDropDown(selects[j]);
} }function hideDropDown(el) {
if (typeof(fade) == "function")
fade(el, false);
else
el.style.visibility = "hidden";
}function showDropDown(el) {
if (typeof(fade) == "function")
fade(el, true);
else if (typeof(swipe) == "function")
swipe(el, 2);
else
el.style.visibility = "visible";
}function initSelectBoxes() {
var spans = document.all.tags("SPAN");
var selects = new Array();
var index = 0;
for (var i=0; i<spans.length; i++) {
if (spans[i].className == "select")
selects[index++] = spans[i];
}
for (var j=0; j<selects.length; j++) {
initSelectBox(selects[j]);
}
}function getReal(el, type, value) {
temp = el;
while ((temp != null) && (temp.tagName != "BODY")) {
if (eval("temp." + type) == value) {
el = temp;
return el;
}
temp = temp.parentElement;
}
return el;
}if (ie4) {
window.onload = initSelectBoxes;
document.onclick = hideShownDropDowns;
}