如何将输入（type = text）从html表单传递给javascript函数

Question

i want to pass the udid taken from textfield to function getusername.

<tr>
     <td> Enter Udid : </td>
     <td> <input name="udid" id="udid" type="text" value="{{udid}}" size="50"></td>
</tr>

<td> 
     <input type="button" value="Get User Name(udid)" onclick="getUserName(udid);"> 
</td>

Answer 1

这应该工作：

onclick="getUserName(document.getElementById('udid').value);"

Answer 2

Try this code:

In your html:

<input type="button" value="Get User Name(udid)" onclick="getUserName(document.getElementById('udid'));">

Function javascript:

function getUserName(id){
    alert(id.value);
}

Look at this demo: JSFIDDLE