
crir = {
init: function() {
arrLabels = document.getElementsByTagName("label");
searchLabels:
for (var i=0; i<arrLabels.length; i++) {
// get the input element based on the for attribute of the label tag
if (arrLabels[i].getAttributeNode("for") && arrLabels[i].getAttributeNode("for").value != "") {
labelElementFor = arrLabels[i].getAttributeNode("for").value;
inputElement = document.getElementById(labelElementFor);
}
else {
continue searchLabels;
}
inputElementClass = inputElement.className;
// if the input is specified to be hidden intiate it
if (inputElementClass == "crirHiddenJS") {
inputElement.className = "crirHidden";
inputElementType = inputElement.getAttributeNode("type").value;
// add the appropriate event listener to the input element
if (inputElementType == "checkbox") {
inputElement.onclick = crir.toggleCheckboxLabel;
}
else {
inputElement.onclick = crir.toggleRadioLabel;
}
// set the initial label state
if (inputElement.checked) {
if (inputElementType == "checkbox") { arrLabels[i].className = "checkbox_checked"}
else { arrLabels[i].className = "radio_checked" }
}
else {
if (inputElementType == "checkbox") { arrLabels[i].className = "checkbox_unchecked"}
else { arrLabels[i].className = "radio_unchecked" }
}
}
else if (inputElement.nodeName != "SELECT" && inputElement.getAttributeNode("type").value == "radio") { // this so even if a radio is not hidden but belongs to a group of hidden radios it will still work.
arrLabels[i].onclick = crir.toggleRadioLabel;
inputElement.onclick = crir.toggleRadioLabel;
}
}
},
findLabel: function (inputElementID) {
arrLabels = document.getElementsByTagName("label");
searchLoop:
for (var i=0; i<arrLabels.length; i++) {
if (arrLabels[i].getAttributeNode("for") && arrLabels[i].getAttributeNode("for").value == inputElementID) {
return arrLabels[i];
break searchLoop;
}
}
},
toggleCheckboxLabel: function () {
labelElement = crir.findLabel(this.getAttributeNode("id").value);
if(labelElement.className == "checkbox_checked") {
labelElement.className = "checkbox_unchecked";
}
else {
labelElement.className = "checkbox_checked";
}
},
toggleRadioLabel: function () {
clickedLabelElement = crir.findLabel(this.getAttributeNode("id").value);
clickedInputElement = this;
clickedInputElementName = clickedInputElement.getAttributeNode("name").value;
arrInputs = document.getElementsByTagName("input");
// uncheck (label class) all radios in the same group
for (var i=0; i<arrInputs.length; i++) {
inputElementType = arrInputs[i].getAttributeNode("type").value;
if (inputElementType == "radio") {
inputElementName = arrInputs[i].getAttributeNode("name").value;
inputElementClass = arrInputs[i].className;
// find radio buttons with the same "name" as the one we"ve changed and have a class of chkHidden
// and then set them to unchecked
if (inputElementName == clickedInputElementName && inputElementClass == "crirHidden") {
inputElementID = arrInputs[i].getAttributeNode("id").value;
labelElement = crir.findLabel(inputElementID);
labelElement.className = "radio_unchecked";
}
}
}
// if the radio clicked is hidden set the label to checked
if (clickedInputElement.className == "crirHidden") {
clickedLabelElement.className = "radio_checked";
}
},
addEvent: function(element, eventType, doFunction, useCapture){
if (element.addEventListener)
{
element.addEventListener(eventType, doFunction, useCapture);
return true;
} else if (element.attachEvent) {
var r = element.attachEvent("on" + eventType, doFunction);
return r;
} else {
element["on" + eventType] = doFunction;
}
}
}
crir.addEvent(window, "load", crir.init, false);
在线演示http://img.jb51.net/online/checkbox/sample.html
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CRIR.rar