[英]Dynamically generate a single new drop down menu in a html form
I have a html form defined . 我定义了一个html表单。 I have a button for the user to select his occupation .
我有一个按钮供用户选择他的职业。 If his occupation happens to be a student then i need to generate another new button dynamically .
如果他的职业恰好是一名学生,那么我需要动态地生成另一个新按钮。 If the user selects anything other than a student then i dont want any new button .
如果用户选择的不是学生,则我不希望有任何新的按钮。 I am unsure how to do .
我不确定该怎么做。 Do i use jquery ?
我是否使用jquery? I have no idea to use jquery .
我不知道使用jquery。 Can some one help ?
有人可以帮忙吗? Any pointers
任何指针
Thanks. 谢谢。
<?php
?>
<script language="javascript" type="text/javascript">
$(document).ready(function()
{
$('#occupation').change(function()
{
if($(this).val() == 'Student')
{
$('#school').show();
} else {
$('#school').hide();
}
});
});
</script>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
<form>
<select name="occupation" id="occupation">
<option value="">- Select Occupation -</option>
<option value="Worker">Worker</option>
<option value="Student">Student</option>
</select>
<select name="school" id="school" style="display: none;">
<option value="">Select School Type</option>
<option value="4 Year">4 Year</option>
<option value="2 Year">2 Year</option>
</select>
</form>
</body>
</html>
Personally I accomplish this by placing the additional form element in the HTML, simply hidden like so: 我个人通过在HTML中放置其他表单元素来实现此目的,就像这样简单地将其隐藏:
<select name="occupation" id="occupation">
<option value="">- Select Occupation -</option>
<option value="Worker">Worker</option>
<option value="Student">Student</option>
</select>
<select name="school" id="school" style="display: none;">
<option value="">Select School Type</option>
<option value="4 Year">4 Year</option>
<option value="2 Year">2 Year</option>
</select>
Then you can use JS, as I prefer jQuery, to show the div or hide the div when applicable: 然后,您可以使用JS(我更喜欢jQuery)来显示div或在适用时隐藏div:
$(document).ready(function()
{
$('#occupation').change(function()
{
if($(this).val() == 'Student')
{
$('#school').show();
} else {
$('#school').hide();
}
});
});
Using jQuery would simplify this: 使用jQuery可以简化此过程:
Let's say you have the following: 假设您具有以下条件:
<form>
<select name="occupation">
<option value="Non-Student">Non-Student</option>
<option value="Student">Student</option>
</select>
</form>
Then the following would be used to append the button if the user selected 'Student': 如果用户选择“学生”,则将使用以下内容附加按钮:
$(function(){
$('select[name="occupation"]').change(function(){
var val = $(this).val();
if(val=='Student'){
$('form').append('<button>New Button</button>');
}
});
});
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