获取img.src值（路径名） [英] Getting img.src value (path name)

问题描述

我有一个注册页面的表单。表单包含一个图像，该图像根据情况更改其src。
在提交表单时激活的脚本中，如果该图像具有特定的src，我希望表单调用警报，因此我需要一种检索和比较值的方法。

I have a form for a registration page. The form contains an image that changes its src dependant on a situation. Within a script which activates upon submission of the form, I want the form to call an alert if that image has a particular src, so I need a way of retrieving and comparing the value.

HTML：

<form action="register_submit.php" method="post" name="mainform" enctype="multipart/form-data" onSubmit="return checkForm(this);return false;">

JS：

    function checkForm(f)
    {if ([image src value] == "pictures/apic.png")
       {
          alert("error picture is apic");
          return false;
       }
     else
       {
          f.submit();
          return false;
       }
    }

以下是完整的相关代码：

Here is the relative code in full:

    <script type="text/javascript">
            function checkForm(f)
            {if ([image src value] == "pictures/apic.png")
               {
                  alert("error picture is apic");
                  return false;
               }
             else
               {
                  f.submit();
                  return false;
               }
            }
    </script>

    <form action="register_submit.php" method="post" name="mainform" enctype="multipart/form-data" onSubmit="return checkForm(this);return false;">

    <div class="required">
    <label for="first_name">*First Name:</label>
    <input type="text" name="first_name" id="first_name" class="inputText" onkeyup="checkFName(this.value);" onblur="checkFName(this.value);" maxlength="20" size="10" value="" />
    <img id="FName_Status" name="FName_Status" src="/pictures/bad.png" style="margin-left:5px; position:absolute;" alt="FName_Status" />
    </div>

    (OTHER OBJECTS)
    </form>

<input type="submit"  name="sub" class="inputSubmit" value="Submit &raquo;"/>

推荐答案

使用此：

if (document.getElementById('FName_Status').getAttribute('src') == "pictures/apic.png")

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