js implements front-end and back-end Json transmission to each other
This time I will bring you js to realize the mutual transmission of Json between the front and backends. What are the things to note. Here are the practical cases. Let’s take a look at them together.
[Jquery basic method]
Jquery and internally encapsulated ajax are commonly used to implement value transfer. First, take a look at jquery's get() and post() syntax. The get() method obtains data from the server. Its main parameters are to obtain the background request address and thecallback function responsible for processing:
$.get(URL,callback);
$("button").click(function(){ $.get("demo_test.php",function(data,status){ alert("数据: " + data + "\n状态: " + status); }); });
post requests data through the HTTP post method:
$.post(URL,data,callback);$("button").click(function(){ $.post("/try/ajax/demo_test_post.php", { name:"菜鸟教程", url:"http://www.runoob.com" }, function(data,status){ alert("数据: \n" + data + "\n状态: " + status); }); });
[spring mvcFramework Jquery ajax]
The controller of the spring mvc framework returns Map@RequestMapping("update") @ResponseBody //此批注是ajax获取返回值使用 public Map<String,Object> update(Long num,BigDecimal amount){ map<string,Object> resultMap=new HashMap<string,Object>(); if(num==null || agentId==null || amount==null){ resultMap.put("result","参数不合法"); return resultMap; } resultMap.put("result",result); }
jquery ajax gets the return value:
var params={}; params.num=num; params.id=id; params.amount=amount; $.ajax({ async:false, type:"post", url:"uset/update", data:params, dataType:"json", success:function(data){ if(data.result=='success'){ alert('修改成功'); }else{ alert('修改失败'); } }, error:function(data){ alert(data.result); } })
[MUI Binding Data Example]
It is easy to obtain the json value obtained by the controller using jquery, so how do we operate the json value? What about binding it to the page control? First, let’s briefly understand the structure of json:var employees=[{"name":"Jon","age":12},{"name":"Tom","age":14}];
Get the value in the json object: var name=employees[0].name;
Modify: employees[0].name ="LiMing";
Application example in MUI framework, add li tag to list:
mui.init(); var url="queryUser" mui.ajax(url,{ data:{ 'type':1, 'limit':10 }, dataType:'json', type:'post', success:function(data){ var songs=data.result.songs; var list=document.getElementById("list"); var fragment=document.creeateDocumentFramgment(); var li; mui.each(songs,function(index,item){ var id=item.id, name=item.album.name, author=item.artists[0].name; li=document.createElement('li'); li.className="mui-table-view-cell mui-media"; li.innerHTML='<a class="mui-navigate-right" id='+ id +' data-audio='+ audio +'>'+'<img class="mui-media-object mui-pull-left" srcload="'+picUrl+'">'+'<p class="mui-media-body">'+name+'<p class="mui-ellipsis">'+author+'</p>'+'</p>'+'</a>'; fragment.appendChild(li); }) list.appendChild(fragment); mui(document).imageLazyload({ placeholder:'../img/60*60.gif'; }); },erro:function(xhr,type,errorThrown){ console.log(type); } }); //列表点击事件 mui("#list").on('tap','li a',function(){ var id=this.getAttribute('id'); var audio=this.getAttribute('data-audio'); mui.openWindow({ url:'music.html', id:'music.html', extras:{ musicId:id, audioUrl:audio } }); });
[Summary]
Compared to xml files, data in json format has fast and stable transmission speed, and is a very good choice in front-end design. I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website! Recommended reading:Detailed explanation of the steps to implement Observer in Vue
Summary of vue parent component calling child component methods
The above is the detailed content of js implements front-end and back-end Json transmission to each other. For more information, please follow other related articles on the PHP Chinese website!

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