自动保存表单内容

来源：互联网发布：js用#获取编辑：程序博客网时间：2024/06/02 18:52
最近运营部的同事给我们提出一个需求--想实现一个自动保存表单内容的功能，因为我们网站的表单页比较多，而且每页面要填的内容也比较多，像那些发布产品，发布需求页面要填的字段比较多，有时候他们电脑突然出问题了，或者不小心把浏览器关了或者...,总之是一些乱七八糟的因素导致页面没有填完就被强行关闭了，那以前辛辛苦苦填的东西就都没有了，所以就有了这个需求。如是就有了下面这段代码：
JS：
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(function(){
    varevents = {};
    varautoSave = function(opts){
        returnnew autoSave.prototype.init(opts)
    };
    autoSave.prototype = {
        constructor:autoSave,
        init:function(opts){
            varset = extend({
                time:10,
                form:'formID',
                url:'',
                changeCallback:function(){}
            },opts || {});
            var_this = this;
            varform = document.getElementById(set.form),timer = null;
            varnames = getFormElement(form);
            events[set.form] = {};
            ajax({
                url:SBI_ROOT+'/html!tempSave.action',
                data:'html='+set.form,
                onsuccess:function(data){
                    vardata = eval('('+this.responseText +')');
                    if(data.param){
                        varvalue = eval('('+data.param.value+')');
                        varcallbacks = eval('('+data.param.callback+')');
                        setAllValue(names,value,set.changeCallback,callbacks||{});
                    }
                }
            });
            timer = setInterval(function(){
                varv = getAllValue(names,events[set.form]);
                if(v.empty)return;
                ajax({
                    url:SBI_ROOT+'/html!tempSave.action',
                    type:'post',
                    data:'html='+set.form+'&param.value='+JSONToString(v)+'&param.callback='+JSONToString(events[set.form]) ,
                    onsuccess:function(){
                        //alert(this.responseText);
                    }
                });
            },set.time * 1000 );
             
            addEvent(form,'submit',function(e){_this.clear(set.form);e.preventDefault();});
        },
        clear:function(form,callback){
            ajax({
                url:SBI_ROOT+'/html!tempDel.action',
                data:'html='+form,
                callback:function(){
                    callback && callback();
                }
            });
        }
    };
    autoSave.prototype.init.prototype = autoSave.prototype;
    window.autoSave = autoSave;
     
    functionextend(source,target){
        for(varpro intarget) source[pro] = target[pro];
        returnsource;
    };
    functiongetAllValue(names,events){
        varV = {empty:true},i=0,len=names.length,v;
        for(;i<len;i++){
            v = getItemValue(names[i],events);
            if(v.value =='' || v.value.length == 0)continue;
            V[v.name] = encodeURIComponent(v.value);
            V.empty =false;
        };
        returnV;
    };
    functiongetItemValue(name,events){
        varels = document.getElementsByName(name),el=els[0],name;
        switch(el.type){
            case'checkbox' :
            case'radio' :
                returngetCheckboxOrRadioValue(els,events);
            case'select' :
                returngetSelectValue(el,events);
            default:
                if(el.value !=''){
                    name = el.name.replace(/^[-\.]|[-\.]&/,'').replace(/[-.]+/g,'_');
                    events[el.name] ='sbi_'+name;
                }
                return{'name':el.name,'value':el.value};
        };
    };
    functiongetCheckboxOrRadioValue(els,events){
        vari=0,len=els.length,re = [],name;
        for(;i<len;i++){
            if(els[i].checked){
                re.push(els[i].value);
                name = els[i].name.replace(/^[-\.]|[-\.]&/,'').replace(/[-.]+/g,'_');
                events[el.name+i] ='sbi_'+name+i;
            };
        };
        return{'name':els[0].name,'value':re};
    };
    functiongetSelectValue(el,events){
        vari=0,options = el.options;len=options.length,option,re=[],name;
        for(;i<len;i++){
            option = options[i];
            if(option.selected){
                varv = '';
                if(option.hasAttribute){
                    v = option.hasAttribute('value') ? option.value : option.text;
                }else{
                    v = option.attributes['value'].specified ? option.value : option.text;
                };
            };
            re.push(v);
        };
        name = el.name.replace(/^[-\.]|[-\.]&/,'').replace(/[-.]+/g,'_');
        events[el.name] ='sbi_'+name;
        return{'name':item.name,'value':re};
    };
    functionsetAllValue(names,v,callback,events){
        vari=0,len=names.length,name;
        for(;i<len;i++){
            name = names[i];
            if(!v[name])continue;
            setItemValue(name,v[name],callback,events);
        };
    };
    functionsetItemValue(name,v,callback,events){
        varels = document.getElementsByName(name),el=els[0],fn;
        switch(el.type){
            case'checkbox' :
            case'radio' :
                returnsetgetCheckboxOrRadioState(els,v,callback,events);
            case'select' :
                returnsetSelectState(el,v,callback,events);
            default:
                if(v !=''){
                    el.value = v;
                    callback && callback.call(el);
                    fn = events[el.name];
                    (typeofwindow[fn] == 'function') && window[fn].call(el);
                };
        };
    };
    functionsetgetCheckboxOrRadioState(els,v,callback,events){
        vari=0,len=els.length,el,fn;
        for(;i<len;i++){
            el = els[i];
            if(hasValue(el.value,v) != -1){
                el.checked =true;
                callback && callback.call(el);
                fn = events[el.name+i];
                (typeoffn == 'function') && fn.call(el);
            }
        };
    };
    functionsetSelectState(el,arr,callback,events){
        vari=0,options = el.options;len=options.length,option,v,fn;
        for(;i<len;i++){
            option = options[i];
            if(option.hasAttribute){
                v = option.hasAttribute('value') ? option.value : option.text;
            }else{
                v = option.attributes['value'].specified ? option.value : option.text;
            };
            if(hasValue(arr,v) != -1){
                option.selected =true;
                callback && callback.call(option);
                fn = events[el.name];
                (typeoffn == 'function') && fn.call(option);
            }
        };
    };
    functionhasValue(arr,v){
        for(vari=0,len=arr.length;i<len;i++){
            if(arr[i] === v)return i;
        };
        return-1;
    };
    functiongetFormElement(form){
        varels = form.elements,i=0,len=els.length,r={},re=[],el;
        for(;i<len;i++){
            el = els[i];
            if(el.type =='button' || el.type == 'submit' || el.type == 'file')continue;
            r[el.name] = [el.name];
        };
        for(varn inr) re.push(r[n]);
        returnre;
    };
    functionaddEvent(el,type,fn){
        if(el.addEventListener){
            el.addEventListener(type,fn,false);
        }elseif(el.attachEvent){
            el.attachEvent('on'+type,fn);
        }else{
            el['on'+type] = fn;
        }
    };
    functioncreateXhr(){
        if(typeofXMLHttpRequest != 'undefined'){
            returnnew XMLHttpRequest();
        }else{
            varxhr = null;
            try{
                xhr =new ActiveXObject('MSXML2.XmlHttp.6.0');
                returnxhr;
            }catch(e){
                try{
                    xhr  =new ActiveXObject('MSXML2.XmlHttp.3.0');
                    returnxhr;
                }catch(e){
                    throwError('cannot create XMLHttp object!');
                };
            };
        };
    };
    functionajax(opts){
        varset = extend({
            url:'',
            data:'',
            type:'GET',
            onsuccess:function(){}
        },opts||{});
        varxhr = createXhr();
        if((set.type).toUpperCase() =='GET'){
            if(set.data){
                set.url += (set.url.indexOf('?') >= 0 ?'&' : '?') + set.data;
                set.data =null;
            };
            if(set.noCache){
                set.url+=(set.url.indexOf('?') >= 0 ?'&' : '?')+'t='+(+newDate());
            };
        };
         
        xhr.onreadystatechange =function(){
            if(xhr.readyState == 4){
                if(xhr.status >= 200 && xhr.status < 300){
                    set.onsuccess.call(xhr);
                };
            };
        };
        xhr.open(set.type,set.url);
        if((set.type).toUpperCase() =='POST'){
            xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
        }
        xhr.send(set.data);
    };
    functionJSONToString(obj){
        if(typeofJSON.stringify !== 'undefined'){
            returnJSON.stringify(obj);
        }else{
            (function(o){
                varr = [];
                if(typeofo =="string")return "\""+o.replace(/([\'\"\\])/g,"\\$1").replace(/(\n)/g,"\\n").replace(/(\r)/g,"\\r").replace(/(\t)/g,"\\t")+"\"";
                if(typeofo =="undefined")return "undefined";
                if(typeofo == "object"){
                    if(o===null)return "null";
                    elseif(!o.push){
                        for(vari ino)
                            r.push("\""+i+"\""+":"+arguments.callee(o[i]));
                        r="{"+r.join()+"}"
                    }else{
                        for(vari =0;i<o.length;i++)
                            r.push(arguments.callee(o[i]));
                        r="["+r.join()+"]"
                    };
                    returnr;
                };
                returno.toString();
            })(obj);
        };
    };
})();
说明：这段JS的功能是每隔一段时间就会把已经填值的表单元素的值保存起来提交到后台，然后在正常提交表单后，会再次发送一个请求通知后台把先前提交的数据删除。如果没有提交表单，那么下次打开的时候，就会把上次已填入的值自动填进表单元素，并且会调用一个以‘sbi’+元素name( 如果name中有-和.会被替换成_，而且会去掉以-或.开头和结尾)为名称的函数，用来执行先前在上面绑定过的事件，比如需要验证，或者需要把图片显示出来，又或者需要根据选中的值来控制层的显示与隐藏。可以手动清除保存在后台的值，比如 var a = autoSave({...});a.clear(formID,callback)
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