隐藏的DOM元素包含消息并使其可见 [英] Hidden DOM element containing the message and to make it visible
问题描述
我需要使用隐藏的DOM元素在点击提交按钮上显示消息请稍等处理，其中包含消息并使其可见，但消息未显示。
$ b $
< form name =siteSearchForm方法= post&＃160;<％= request.getContextPath（）％> / servlet / visibilityControlleronsubmit =javascript：return validate（）; on_load（）>
< td align =centerwidth =10％>< input type = submit name =siteSearchSubmitvalue =SUBMIT>& nbsp;< input type =RESET name =clearTNvalue =RESET>< / td>
< / form>
我通过调用 on_load 在 onsubmit 中的表单标签上，但它没有显示消息
<头>
< script type =text / javascript>
函数on_load（）{
var y = document.getElementById（txtHiddenUname）;
y.type =text;
}
< / script>
< / head>
< body>
< input type =hiddenid =txtHiddenUnamevalue =invalid input/>
< / body>
因为return语句会退出函数调用，之后它会运行。您需要在返回前添加它。
onsubmit =on_load（）; return validate（）;
或者您可以做
onsubmit =return validate（）&& on_load（）;
但您的on_load函数需要返回true。
function on_load（）{return true; }
此外，为什么您使用输入来显示消息？看起来像你应该使用一个显示无/块的段落。 javascript：在事件处理程序中不需要，on_load似乎应该在窗口加载时调用，而不是表单提交。
I need to show message "Please wait Processing" on click of Submit button using a hidden DOM element which contains the message and make it visible, but the message is not showing.
My html for the form and my validate function are given below.
<form name="siteSearchForm" method=post action="<%=request.getContextPath()%>/servlet/visibilityController" onsubmit="javascript:return validate();on_load()">
<td align="center" width="10%"><input type=submit name="siteSearchSubmit" value="SUBMIT" > <input type="RESET" name="clearTN" value="RESET"></td>
</form>
I tried the below code by calling on_load on form tag during onsubmit but it is not showing message
<head>
<script type="text/javascript">
function on_load(){
var y = document.getElementById("txtHiddenUname");
y.type= "text";
}
</script>
</head>
<body>
<input type="hidden" id="txtHiddenUname" value="invalid input" />
</body>
Becuase the return statement will exit the function call and nothing after it will run. You would need to add it BEFORE the return.
onsubmit="on_load(); return validate();"
or you can do
onsubmit="return validate() && on_load();"
but your on_load function needs to return true.
function on_load(){ return true; }
Also why are you using an input to display a message? Seems like you should be using a paragraph with display none/block. javascript: is not needed in event handlers, and on_load seems like it should be called on window load, not a form submission.
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