form表单序列化详解（推荐）

form的序列化，即将表单中的键值序列化为可提交的字符串

表单

<form> <select> <option value="age1">20</option> <option value="age2" selected>21</option> </select> <input value="Cynthia"> <label>passsword</label> <input type="password" value="123456"> <input type="hidden" value="3333"> <textarea cols="15" rows="5">description</textarea> <input type="checkbox" value="football" checked> Football <input type="checkbox" value="basketball"> Basketball <input type="radio" value="Female" checked> Female <input type="radio" value="Male"> Male </form>

方法一 

function serializeForm1(form){ var setForm = ""; for(var key in form){ if(form.hasOwnProperty(key)){ setForm += '"'+form[key].name+'"'+':'+'"'+form[key].value + '"'+','; } } setForm = "{" + setForm.slice(0,setForm.length -1) + "}"; console.log(setForm); // console.log(JSON.parse(setForm)); return JSON.parse(setForm); } // 调用 var oForm = document.getElementById('target'); console.log(serializeForm3(oForm));

结果：

方法二

function serializeForm2(form) { var parts = []; for (var i = 0, i1 = form.elements.length; i < i1; i++) { var field = form.elements[i]; switch (field.type) { case 'select-one': case 'select-multiple': if (field.type.length) { for (var j = 0, j1 = field.options.length; j < j1; j++) { var option = field.options[j]; if (option.selected) { var optionValue = ''; if (option.hasAttribute('value') && option.attributes['value'].specified) { //specified表明是否有此属性，有的话返回true，若定义了此属性但尚未添加到元素中也返回true。 optionValue = option.value; } else { optionValue = optionValue.text; } parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(optionValue)); } } } break; case undefined: case 'file': case 'submit': case 'reset': case 'button': break; case 'radio': case 'checkbox': if(!field.checked){ break; }else{ parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(field.dataset['index'])); break; } default: if(field.name.length){ parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(field.value)); } } } return parts.join('&'); } // 调用 var oForm = document.getElementById('target'); console.log(serializeForm2(oForm));

结果：

方法三

function serializeForm3(form){ if(!form||form.tagName.toUpperCase()!='FORM'){ return false; } var res=[]; var tag,tagType,tagVal,tagName; for(var i=0;i<form.length;i++){ tag=form[i]; tagType=form[i].type; tagVal=form[i].value; tagName=form[i].name; var reg1=https://www.jb51.net/['textarea'|'text'|'passsword'|'label']/g; var reg2=https://www.jb51.net/['radio'|'checkbox']/g; var reg3=https://www.jb51.net/['select']/g; if(reg1.test(tagType)){ res.push(encodeURIComponent(tagName)+"="+encodeURIComponent(tagVal)); }else if(reg2.test(tagType)&&tag.checked){ res.push(encodeURIComponent(tagName)+"="+encodeURIComponent(tagVal)); }else if(reg3.test(tagType)){ for(var j=0;j<tag.options.length;j++){ if(tag.options[j].selected){ res.push(encodeURIComponent(tagVal)+"="+encodeURIComponent(tag.options[j].value||tag.options[j].text)); } } }else{} } return res.join(" & "); } // 调用 var oForm = document.getElementById('target'); console.log(serializeForm3(oForm));

结果：