


出现自动提交的情况,有两种可能:一是编写了javascript代码,当用户点按Enter键时,通过js事件侦听机制触发表单的提交。二是利用了浏览器的默认行为(至少发现ie是这样的)。浏览器在解析网页的时候,有许多默认的行为,例如如果一个页面上有表单和一个提交按钮,那么打开页面时,焦点会自动落在这个提交按钮上面。同样如果一个表单中只有一个单行文本输入域(text),那么在这个输入域中按Enter键时,浏览器会自动提交该表单。我们对于第一种情况一般都知道而且很容易理解,但是对于第二种浏览器的默认行为,可能知道这一点的人就比较少了,下面我具体看一下浏览器(至少ie如此)在表单提交上的默认行为。如果表单中含有一个单行文本输入域,那么无论含有多少其他类型的表单组件,那么在该输入域中点击Enter时,表单会自动提交。
例如下面的代码:<form action="" method="post"<input type="text"name="sdfsdf"/<textarea</textarea<input type="checkbox"sdfsdf<input type="hidden"name="aa"/</form如果表单中含有两个或多个单行文本输入域,那么无论是否含有其他类型的表单组件,按Enter键时不会自动提交,例如:<form action="" method="post"<input type="text"name="sdfsdf"/<input type="text"name="sddf"/</form办法很简单,我们上面举的例子中已经有了,只要再添加一个文本输入框就可以了,可能你会说,为了不自动提交就要增加一个没有用的输入框,而且中含有两个输入框最终用户会接受吗?其实可以解决,你可以将那个新添加的输入框通过style隐藏即可,例如:<form action="" method="post"<input type="text" name="notautosubmit"style="display:none"/<input type="text"name="username"/</form还有一个方法可以绑定button按钮 enter触发事件:document.onkeypress = function(){if(event.keyCode == 13) {search();returnfalse;}}其中search方法是onclick事件:<form name="searchfrom"

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