事件未在Firefox中定义

Question

我已经注意到其他一些类似性质的帖子,但没有人回答我的问题,这就是我发布这个帖子的原因.

我正在尝试创建一个简单的表单,其中每个输入/ textarea元素在由onblur效果和值===""触发时变为红色.以下代码适用于Crhome和IE,但在Firefox'事件未定义' - 即使我正在通过一个事件.

见下面的代码.

//declare gloabl variables
var srcForm = document.myForm;
var nameField = srcForm.nameTxt;
var emailField = srcForm.emailTxt;
var commentsField = srcForm.comments;

//function for field onfocus events
function focusClear (event) {
var eSrc = nuahs.eventUtility.eventSource(event);
if(eSrc.className === "invalid") {
    eSrc.className = "";
    eSrc.value = "";    
}
}

//function for field onblur events
function blurCheck (event) {
var eSrc = nuahs.eventUtility.eventSource(event);
if(eSrc.value === "") {
    eSrc.className = "invalid";
    eSrc.value = "This field is required";  
}
}

//set up event handlers for focus events on each field
nuahs.eventUtility.addEvent(nameField, "focus", function() { focusClear(event)});
nuahs.eventUtility.addEvent(emailField, "focus", function() { focusClear(event)});
nuahs.eventUtility.addEvent(commentsField, "focus", function() { focusClear(event)});

//set up event handlers for focus events on each field
nuahs.eventUtility.addEvent(nameField, "blur", function() { blurCheck(event)});
nuahs.eventUtility.addEvent(emailField, "blur", function() { blurCheck(event)});
nuahs.eventUtility.addEvent(commentsField, "blur", function() { blurCheck(event)});

所以,你可以看到 - 在底部 - 我正在使用blurCheck和focusCheck函数处理我的事件,并传入事件.因此我不知道为什么FF不承认它!

nuahs对象只是另一个脚本中的简单事件实用程序,但为了完整性,您可以在下面看到它:

var nuahs = new Object();

nuahs.eventUtility = {
addEvent: function() {
    if(typeof addEventListener !== "undefined") {
        return function(obj, evt, fn) {
            obj.addEventListener(evt, fn, false);   
        };
    } else {
        return function(obj, evt, fn) {
            obj.attachEvent("on" + evt, fn);    
        };
    }
}(),
removeEvent: function() {
    if(typeof addEventListener !== "undefined") {
        return function(obj, evt, fn) {
            obj.removeEventListener(evt, fn, false);    
        };
    } else {
        return function(obj, evt, fn) {
            obj.detachEvent("on" + evt, fn);    
        };
    }
}(),
eventSource: function(event) {
    if (typeof addEventListener !== "undefined") {
        return event.target;    

    } else {
        return event.srcElement;    
    }
},
preventDefault: function() {
    if (typeof addEventListener !== "undefined") {
        return function(event) {
            event.preventDefault(); 
        }
    } else {
        return function(event) {
            event.returnValue = false;  
        }
    }
}(),
stopEvent: function() { //to stop event capture and bubbling
    if (typeof addEventListener !== "undefined") {
        return function(event) {
            event.stopPropagation();    
        }
    } else {
        return function(event) {
            event.cancelBubble = true;
        }
    }
}()
} 

任何帮助非常感谢!

Answer 1

你忘了传递事件对象了.它只是旧版IE中的全球版本.

nuahs.eventUtility.addEvent(nameField, "focus", function(event) { focusClear(event)});
nuahs.eventUtility.addEvent(emailField, "focus", function(event) { focusClear(event)});
nuahs.eventUtility.addEvent(commentsField, "focus", function(event) { focusClear(event)});

或者甚至更好,保留this以防您的实用程序库将其设置为适当的值:

nuahs.eventUtility.addEvent(nameField, "focus", focusClear);
nuahs.eventUtility.addEvent(emailField, "focus", focusClear);
nuahs.eventUtility.addEvent(commentsField, "focus", focusClear);