tbr*_*fni 89 javascript asp.net prompt
我需要在ASP .Net应用程序中实现"未保存的更改"提示.如果用户修改了Web表单上的控件,并尝试在保存之前导航,则会出现一个提示,提示他们有未保存的更改,并为他们提供取消和保留在当前页面的选项.如果用户未触及任何控件,则不应显示提示.
理想情况下,我想在JavaScript中实现它,但在我开始编写自己的代码之前,是否有任何现有的框架或推荐的设计模式来实现这一目标？理想情况下,我希望能够轻松地在多个页面上重复使用,而且变化很小.
Aar*_*ell 92
使用jQuery:
var _isDirty = false;
$("input[type='text']").change(function(){
_isDirty = true;
});
// replicate for other input types and selects
与onunload/ 结合onbeforeunload根据需要方法.
从注释中,以下引用所有输入字段,而不重复代码:
$(':input').change(function () {
使用$(":input")是指所有输入,textarea,select和按钮元素.
Jon*_*nan 43
一块拼图:
/**
* Determines if a form is dirty by comparing the current value of each element
* with its default value.
*
* @param {Form} form the form to be checked.
* @return {Boolean} <code>true</code> if the form is dirty, <code>false</code>
* otherwise.
*/
function formIsDirty(form) {
for (var i = 0; i < form.elements.length; i++) {
var element = form.elements[i];
var type = element.type;
if (type == "checkbox" || type == "radio") {
if (element.checked != element.defaultChecked) {
return true;
}
}
else if (type == "hidden" || type == "password" ||
type == "text" || type == "textarea") {
if (element.value != element.defaultValue) {
return true;
}
}
else if (type == "select-one" || type == "select-multiple") {
for (var j = 0; j < element.options.length; j++) {
if (element.options[j].selected !=
element.options[j].defaultSelected) {
return true;
}
}
}
}
return false;
}
而另一个:
window.onbeforeunload = function(e) {
e = e || window.event;
if (formIsDirty(document.forms["someForm"])) {
// For IE and Firefox
if (e) {
e.returnValue = "You have unsaved changes.";
}
// For Safari
return "You have unsaved changes.";
}
};
总结一下,你得到了什么？
var confirmExitIfModified = (function() {
function formIsDirty(form) {
// ...as above
}
return function(form, message) {
window.onbeforeunload = function(e) {
e = e || window.event;
if (formIsDirty(document.forms[form])) {
// For IE and Firefox
if (e) {
e.returnValue = message;
}
// For Safari
return message;
}
};
};
})();
confirmExitIfModified("someForm", "You have unsaved changes.");
您可能还想更改beforeunload事件处理程序的注册以使用LIBRARY_OF_CHOICE事件注册.
Way*_*yne 17
在.aspx页面中,您需要一个Javascript函数来判断表单信息是否"脏"
<script language="javascript">
var isDirty = false;
function setDirty() {
isDirty = true;
}
function checkSave() {
var sSave;
if (isDirty == true) {
sSave = window.confirm("You have some changes that have not been saved. Click OK to save now or CANCEL to continue without saving.");
if (sSave == true) {
document.getElementById('__EVENTTARGET').value = 'btnSubmit';
document.getElementById('__EVENTARGUMENT').value = 'Click';
window.document.formName.submit();
} else {
return true;
}
}
}
</script>
<body class="StandardBody" onunload="checkSave()">
并在代码隐藏中,将触发器添加到输入字段以及重置提交/取消按钮....
btnSubmit.Attributes.Add("onclick", "isDirty = 0;");
btnCancel.Attributes.Add("onclick", "isDirty = 0;");
txtName.Attributes.Add("onchange", "setDirty();");
txtAddress.Attributes.Add("onchange", "setDirty();");
//etc..
小智 9
以下使用浏览器的onbeforeunload函数和jquery来捕获任何onchange事件.它还会查找任何提交或重置按钮以重置指示已发生更改的标志.
dataChanged = 0; // global variable flags unsaved changes
function bindForChange(){
$('input,checkbox,textarea,radio,select').bind('change',function(event) { dataChanged = 1})
$(':reset,:submit').bind('click',function(event) { dataChanged = 0 })
}
function askConfirm(){
if (dataChanged){
return "You have some unsaved changes. Press OK to continue without saving."
}
}
window.onbeforeunload = askConfirm;
window.onload = bindForChange;
感谢大家的回复.我最终使用JQuery和Protect-Data插件实现了一个解决方案.这允许我自动将监控应用于页面上的所有控件.
但是有一些注意事项,特别是在处理ASP .Net应用程序时:
当用户选择取消选项时,doPostBack函数将抛出JavaScript错误.我不得不手动在doPostBack中的.submit调用周围放置一个try-catch来抑制它.
在某些页面上,用户可以执行执行回发到同一页面的操作,但不是保存.这会导致任何JavaScript逻辑重置,因此它认为在回发之后没有任何内容发生变化.我必须实现一个隐藏的文本框,该文本框与页面一起回发,并用于保存一个简单的布尔值,指示数据是否脏.这会在回发中持续存在.
您可能希望页面上的一些回发不触发对话框,例如"保存"按钮.在这种情况下,您可以使用JQuery添加一个OnClick函数,该函数将window.onbeforeunload设置为null.
希望这对任何必须实现类似功能的人都有帮助.
以下解决方案适用于原型(在FF,IE 6和Safari中测试).它使用通用表单观察器(触发表单:在修改表单的任何字段时更改),您也可以将其用于其他内容.
/* use this function to announce changes from your own scripts/event handlers.
* Example: onClick="makeDirty($(this).up('form'));"
*/
function makeDirty(form) {
form.fire("form:changed");
}
function handleChange(form, event) {
makeDirty(form);
}
/* generic form observer, ensure that form:changed is being fired whenever
* a field is being changed in that particular for
*/
function setupFormChangeObserver(form) {
var handler = handleChange.curry(form);
form.getElements().each(function (element) {
element.observe("change", handler);
});
}
/* installs a form protector to a form marked with class 'protectForm' */
function setupProtectForm() {
var form = $$("form.protectForm").first();
/* abort if no form */
if (!form) return;
setupFormChangeObserver(form);
var dirty = false;
form.observe("form:changed", function(event) {
dirty = true;
});
/* submitting the form makes the form clean again */
form.observe("submit", function(event) {
dirty = false;
});
/* unfortunatly a propper event handler doesn't appear to work with IE and Safari */
window.onbeforeunload = function(event) {
if (dirty) {
return "There are unsaved changes, they will be lost if you leave now.";
}
};
}
document.observe("dom:loaded", setupProtectForm);
这是一个简单的javascript/jquery解决方案.它由用户解释"undos",它被封装在一个函数中以便于应用,并且它在提交时不会失败.只需调用该函数并传递表单的ID即可.
此功能在加载页面时将表单序列化一次,并在用户离开页面之前再次序列化表单.如果两个表单状态不同,则会显示提示.
尝试一下:http://jsfiddle.net/skibulk/Ydt7Y/
function formUnloadPrompt(formSelector) {
var formA = $(formSelector).serialize(), formB, formSubmit = false;
// Detect Form Submit
$(formSelector).submit( function(){
formSubmit = true;
});
// Handle Form Unload
window.onbeforeunload = function(){
if (formSubmit) return;
formB = $(formSelector).serialize();
if (formA != formB) return "Your changes have not been saved.";
};
}
$(function(){
formUnloadPrompt('form');
});
常规解决方案支持给定页面中的多个表单(只需复制并粘贴到项目中)
$(document).ready(function() {
$('form :input').change(function() {
$(this).closest('form').addClass('form-dirty');
});
$(window).bind('beforeunload', function() {
if($('form:not(.ignore-changes).form-dirty').length > 0) {
return 'You have unsaved changes, are you sure you want to discard them?';
}
});
$('form').bind('submit',function() {
$(this).closest('form').removeClass('form-dirty');
return true;
});
});
注意:此解决方案与其他解决方案相结合,可创建通用集成解决方案.
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