Form中的每个对象都保留了初始值,所以可以在提交表单时,遍历Form中对象,
检查对象当前的值与初始值是否一致,就判断出了表单是否被修改了。
示例代码
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function IsFormChanged()
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{
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var isChanged = false;
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var form = document.forms[0];
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for (var i = 0; i < form.elements.length; i++)
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{
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var element = form.elements[i];
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var type = element.type;
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if (type == "text" || type == "hidden" || type == "textarea" || type == "button")
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{
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if (element.value != element.defaultValue)
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{
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isChanged = true;
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break;
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}
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}
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else if (type == "radio" || type == "checkbox")
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{
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if (element.checked != element.defaultChecked)
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{
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isChanged = true;
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break;
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}
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}
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else if (type == "select-one")
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{
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for (var j = 0; j < element.options.length; j++)
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{
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if (element.options[j].selected != element.options[j].defaultSelected)
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{
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isChanged = true;
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break;
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}
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}
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}
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else
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{
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//
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}
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}
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return isChanged;
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}
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