Javascript获取元素值 [英] Javascript Get Element Value

问题描述

  // HTML 
< input id =theId value =testonclick =doSomething（this.id，this.value）/> 
 
 // Javascript 
函数doSomething（id，value）{
 // ... 
} 
  

或

  // HTML 
< input id =theIdvalue =testonclick =doSomething（this.id）/> 
 
 // Javascript 
函数doSomething（id）{
 var value = document.getElementById（id）.value; 
 // ... 
} 
  

解决方案

是的，最值得注意的是我不认为第二个会起作用（并且如果是这样，不会很便携）。

  // HTML 
  
 // Javascript 
函数（elem）{
 var value = elem.value; 
 var id = elem.id; 
 ... 
} 
  

同样可以工作

Is there any difference between these to solutions?

// HTML
<input id="theId" value="test" onclick="doSomething(this.id, this.value)" />

// Javascript
function doSomething(id, value){
    // ...
}

or

// HTML
<input id="theId" value="test" onclick="doSomething(this.id)" />

// Javascript
function doSomething(id){
    var value = document.getElementById(id).value;
    // ...
}

解决方案

Yes, most notably I don't think the second one will work (and if it does, not very portably). The first one should be ok.

// HTML
<input id="theId" value="test" onclick="doSomething(this)" />

// Javascript
function(elem){
    var value = elem.value;
    var id    = elem.id;
    ...
}

Should also work

这篇关于Javascript获取元素值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！