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, 1function IsFormChanged()
2{ 3 var isChanged = false; 4 var form = document.forms[0]; 5 for (var i = 0; i < form.elements.length; i++) 6 { 7 var element = form.elements[i]; 8 var type = element.type; 9 if (type == "text" || type == "hidden" || type == "textarea" || type == "button") 10 { 11 if (element.value != element.defaultValue) 12 { 13 isChanged = true; 14 break; 15 } 16 } 17 else if (type == "radio" || type == "checkbox") 18 { 19 if (element.checked != element.defaultChecked) 20 { 21 isChanged = true; 22 break; 23 } 24 } 25 else if (type == "select-one") 26 { 27 for (var j = 0; j < element.options.length; j++) 28 { 29 if (element.options[j].selected != element.options[j].defaultSelected) 30 { 31 isChanged = true; 32 break; 33 } 34 } 35 } 36 else 37 { 38 // 39 } 40 } 41 42 return isChanged; 43} |
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