从html表单调用javascript

Jos*_*he4 50 html javascript forms dom-events

我的问题和例子都是基于Jason在这个问题上的答案

我试图避免使用eventListner,只是在单击提交按钮时调用handleClick onsubmit.

我的代码绝对没有任何反应.

为什么handleClick没有被调用?

<html>
  <head>
    <script type="text/javascript">
      function getRadioButtonValue(rbutton)
      {
        for (var i = 0; i < rbutton.length; ++i)
        { 
          if (rbutton[i].checked)
            return rbutton[i].value;
        }
        return null;
      }

      function handleClick(event)
      {
        alert("Favorite weird creature: "+getRadioButtonValue(this["whichThing"]));
        event.preventDefault(); // disable normal form submit behavior
        return false; // prevent further bubbling of event
      }
    </script>
  </head>
<body>
    <form name="myform" onSubmit="JavaScript:handleClick()">
      <input name="Submit"  type="submit" value="Update" onClick="JavaScript:handleClick()"/>
      Which of the following do you like best?
      <p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
      <p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
      <p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
    </form>
</body>
</html>
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编辑:

请不要建议框架作为解决方案.

以下是我对代码所做的相关更改,这会导致相同的行为.

      function handleClick()
      {
        alert("Favorite weird creature: "+getRadioButtonValue(document.myform['whichThing'])));
        event.preventDefault(); // disable normal form submit behavior
        return false; // prevent further bubbling of event
      }
    </script>
  </head>
<body>
<form name="aye">;
      <input name="Submit"  type="submit" value="Update" action="JavaScript:handleClick()"/>
      Which of the following do you like best?
      <p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
      <p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
      <p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
    </form>
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Miq*_*uel 65

您可以使用javascript url表单

<form action="javascript:handleClick()">
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或者使用onSubmit事件处理程序

<form onSubmit="return handleClick()">
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在后面的表单中,如果从handleClick返回false,则会阻止正常的submision过程.如果您希望浏览器遵循正常的submision过程,则返回true.

由于该Javascript:部分,按钮中的onSubmit事件处理程序也会失败

编辑: 我刚尝试这个代码,它的工作原理:

<html>
  <head>
    <script type="text/javascript">

      function handleIt() {
        alert("hello");
      }

    </script>
  </head>

<body>
    <form name="myform" action="javascript:handleIt()">
      <input name="Submit"  type="submit" value="Update"/>
    </form>
</body>
</html>
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Ste*_*ton 28

在这段代码中:

getRadioButtonValue(this["whichThing"]))
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你实际上并没有得到任何参考.因此,getradiobuttonvalue函数中的radiobutton未定义并引发错误.

编辑 要从单选按钮中获取值,请抓取JQuery库,然后使用:

  $('input[name=whichThing]:checked').val() 
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编辑2 由于需要重新发明轮子,这里是非Jquery代码:

var t = '';
for (i=0; i<document.myform.whichThing.length; i++) {
     if (document.myform.whichThing[i].checked==true) {
         t = t + document.myform.whichThing[i].value;
     }
}
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或者,基本上,修改原始代码行以便如此阅读:

getRadioButtonValue(document.myform.whichThing))
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编辑3 这是你的作业:

      function handleClick() {
        alert("Favorite weird creature: " + getRadioButtonValue(document.aye.whichThing));
        //event.preventDefault(); // disable normal form submit behavior
        return false; // prevent further bubbling of event
      }
    </script>
  </head>
<body>
<form name="aye" onSubmit="return handleClick()">
     <input name="Submit"  type="submit" value="Update" />
     Which of the following do you like best?
     <p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
     <p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
     <p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
</form>
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请注意以下内容,我已将函数调用移到Form的"onSubmit"事件中.另一种方法是将SUBMIT按钮更改为标准按钮,并将其放入按钮的OnClick事件中.我还删除了函数名前面不需要的"JavaScript",并在函数出来的值上添加了显式RETURN.

在函数本身中,我修改了表单的访问方式.结构是: 文件.[表格名称].[控制名称]来获取东西.由于您是从aye重命名的,因此必须更改document.myform.到document.aye.另外,document.aye ["whichThing"]在这种情况下是错误的,因为它需要是document.aye.whichThing.

最后一点,我注释掉了event.preventDefault(); .该样本不需要该行.

编辑4只是要清楚.document.aye ["whichThing"]将为您提供对所选值的直接访问,但document.aye.whichThing可让您访问您需要检查的单选按钮集合.由于您使用"getRadioButtonValue(object)"函数来遍历集合,因此您需要使用document.aye.whichThing.

看看这种方法的不同之处:

function handleClick() {
   alert("Direct Access: " + document.aye["whichThing"]);
   alert("Favorite weird creature: " + getRadioButtonValue(document.aye.whichThing));
   return false; // prevent further bubbling of event
}
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小智 11

Miquel(#32)的漂亮例子应该重新填充:

<html>
 <head>
  <script type="text/javascript">
   function handleIt(txt) {   // txt == content of form input
    alert("Entered value: " + txt);
   }
  </script>
 </head>
 <body>
 <!-- javascript function in form action must have a parameter. This 
    parameter contains a value of named input -->
  <form name="myform" action="javascript:handleIt(lastname.value)">  
   <input type="text" name="lastname" id="lastname" maxlength="40"> 
   <input name="Submit"  type="submit" value="Update"/>
  </form>
 </body>
</html>
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表格应该有:

<form name="myform" action="javascript:handleIt(lastname.value)"> 
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