[英]Unable to addClass using Javascript
I would like to style all the empty textboxes,by adding a class on validation (ie on Submit), but my code isn't working. 我想通过在验证时(即在Submit上)添加一个类来为所有空文本框设置样式,但我的代码无法正常工作。 Not sure if its the script or the customvalidator.
不知道它是脚本还是customvalidator。 I only want to use JS.
我只想使用JS。 If I say
如果我说
target.style.border="1px solid red";
its working though. 它的工作。 Just unable to add the class.
只是无法添加课程。
JS: JS:
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
function validateTextBox(sender, args) {
var target = document.getElementById(sender.controltovalidate);
var is_valid = target.value != "";
if (is_valid) {
target.removeClass("validate");
}
else {
target.addClass("validate");
}
args.IsValid = is_valid;
}
</script>
ASPX: ASPX:
<asp:TextBox ID="txtSurname" runat="server"></asp:TextBox>
<asp:CustomValidator ID = "CustomValidator1" runat="server"
ControlToValidate="txtSurname" ValidateEmptyText="true"
ClientValidationFunction="validateTextBox"
></asp:CustomValidator>
CSS: CSS:
.validate
{
border:2px solid red;
}
document.getElementById returns a DOM element, which does not have addClass or removeClass APIs. document.getElementById返回一个DOM元素,该元素没有addClass或removeClass API。
To apply class, try (putting the idea, please tweak according to exact business logic): 要申请课程,请尝试(提出想法,请根据确切的业务逻辑进行调整):
target.className = target.className + " validate"
If we go with raw JS, we have to write raw code and forget luxuries of addClass or removeClass :-) To remove class, see this answer: Remove class using javascript 如果我们使用原始JS,则必须编写原始代码,而忘了addClass或removeClass的奢侈品:-)要删除类,请参见以下答案: 使用javascript删除类
try this... 尝试这个...
function validateTextBox(sender, args) {
var target = document.getElementById(sender.controltovalidate.ClientID);
if (target.value != "") {
target.removeClass("validate");
}
else {
target.addClass("validate");
}
args.IsValid = "";
}
Try this. 尝试这个。 Simple way .
简单的方法。
function validateTextBox() {
var target = document.getElementById("#<%= txtSurname.ClientID %>");
**var is_valid = target.value;**
**if (is_valid!="") {**
target.removeClass("validate");
**return true;**
}
else {
target.addClass("validate");
**return false**
}
}
ASPX: ASPX:
<asp:TextBox ID="txtSurname" runat="server"></asp:TextBox>
<asp:CustomValidator ID = "CustomValidator1" runat="server"
ControlToValidate="txtSurname" ValidateEmptyText="true"
ClientValidationFunction=**"Javascript:return validateTextBox()"**
></asp:CustomValidator>
Maybe you would like to use jquery validation plugin ? 也许您想使用jquery验证插件 ? This is widely used plugin.
这是广泛使用的插件。
<asp:TextBox ID="txtSurname" runat="server" CssClass="toValidate"></asp:TextBox>
jQuery(function() {
// You can specify some validation options here but not rules and messages
jQuery('form').validate();
// Add a custom class to your name mangled input and add rules like this
jQuery('.toValidate').rules('add', {
required: true
});
});
This code should check if textbox are empty before form submition. 此代码应在提交表单之前检查文本框是否为空。
change var target = document.getElementById(sender.controltovalidate.ClientID);
更改
var target = document.getElementById(sender.controltovalidate.ClientID);
to: var target = document.getElementById(sender.ClientID);
到:
var target = document.getElementById(sender.ClientID);
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