我正在尝试从此链接 http://www.appelsiini.net/projects/chained 中选择 3 层链
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js">
<script language="JavaScript" type="text/javascript" src="http://www.appelsiini.net/projects/chained/jquery.chained.js?v=0.9.4" charset="utf-8"></script>
<script language="JavaScript" type="text/javascript" src="http://www.appelsiini.net/projects/chained/jquery.chained.remote.js?v=0.9.4" charset="utf-8"></script>
<select id="mark" name="mark">
<option value="">--</option>
<option value="bmw">BMW</option>
<option value="audi">Audi</option>
</select>
<select id="series" name="series">
<option value="">--</option>
<option value="series-3" class="bmw">3 series</option>
<option value="series-5" class="bmw">5 series</option>
<option value="series-6" class="bmw">6 series</option>
<option value="a3" class="audi">A3</option>
<option value="a4" class="audi">A4</option>
<option value="a5" class="audi">A5</option>
</select>
<select id="model" name="model">
<option value="">--</option>
<option value="coupe" class="series-3 series-6 a5">Coupe</option>
<option value="cabrio" class="series-3 series-6 a3 a5">Cabrio</option>
<option value="sedan" class="series-3 series-5 a3 a4">Sedan</option>
<option value="sportback" class="a3 a5">Sportback</option>
</select>
<script language="JavaScript" type="text/javascript">
var $ = jQuery.noConflict();
jQuery(document).ready(function($) {
/* For $.chained.js */
$("#series").chained("#mark");
$("#model").chained("#series");
$("#engine").chained("#series, #model");
return;
/* Show button after each pulldown has a value. */
$("#engine").bind("change", function(event) {
if ("" != $("option:selected", this).val() && "" != $("option:selected", $("#model")).val()) {
$("#button").fadeIn();
} else {
$("#button").hide();
}
})
});
</script>
</html>
当我运行此代码时，遇到下拉列表无法链接的问题并显示错误消息TypeError: Cannot read property 'fn' of undefined。那么如何解决这个问题呢？谢谢
最佳答案
You missed the close tag of first
<script>.
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
否则你的代码工作正常。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script language="JavaScript" type="text/javascript" src="http://www.appelsiini.net/projects/chained/jquery.chained.js?v=0.9.4" charset="utf-8"></script>
<script language="JavaScript" type="text/javascript" src="http://www.appelsiini.net/projects/chained/jquery.chained.remote.js?v=0.9.4" charset="utf-8"></script>
<select id="mark" name="mark">
<option value="">--</option>
<option value="bmw">BMW</option>
<option value="audi">Audi</option>
</select>
<select id="series" name="series">
<option value="">--</option>
<option value="series-3" class="bmw">3 series</option>
<option value="series-5" class="bmw">5 series</option>
<option value="series-6" class="bmw">6 series</option>
<option value="a3" class="audi">A3</option>
<option value="a4" class="audi">A4</option>
<option value="a5" class="audi">A5</option>
</select>
<select id="model" name="model">
<option value="">--</option>
<option value="coupe" class="series-3 series-6 a5">Coupe</option>
<option value="cabrio" class="series-3 series-6 a3 a5">Cabrio</option>
<option value="sedan" class="series-3 series-5 a3 a4">Sedan</option>
<option value="sportback" class="a3 a5">Sportback</option>
</select>
<script language="JavaScript" type="text/javascript">
var $ = jQuery.noConflict();
jQuery(document).ready(function($) {
/* For $.chained.js */
$("#series").chained("#mark");
$("#model").chained("#series");
$("#engine").chained("#series, #model");
return;
/* Show button after each pulldown has a value. */
$("#engine").bind("change", function(event) {
if ("" != $("option:selected", this).val() && "" != $("option:selected", $("#model")).val()) {
$("#button").fadeIn();
} else {
$("#button").hide();
}
})
});
</script>
</html>关于javascript - jQuery 链式选择类型错误 : Cannot read property 'fn' of undefined，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38407718/