我已经为两个下拉框编写了 html 代码。当我们更改第二个下拉列表 (onchange) 时，我想将这两个值作为参数传递给 javascript 函数。
这是我的代码:
function CatName(str1, str2) {
if (str == "") {
document.getElementById("album_name").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("album_name").innerHTML = xmlhttp.responseText;
}
};
xmlhttp.open("GET", "update.php?q=" + str1 + "&q1=" + str2, true);
xmlhttp.send();
}
}<div class="col-xs-6 col-sm-6 col-md-4 col-md-offset-1">
<div class="form-group">
<select class="form-control" name="category_name">
<option value="" selected>Please Select</option>
<option value="Birds">Birds</option>
<option value="Notinlist">Category Not in list</option>
</select>
</div>
</div>
<div class="col-xs-6 col-sm-6 col-md-4 col-md-offset-1">
<div class="form-group">
<select class="form-control" name="album_name" onchange="CatName(this.value)">
<option value="" selected>Please Select</option>
<option value="Dove">Dove</option>
<option value="Parrot">Parrot</option>
<option value="Notinlist">Category Not in list</option>
</select>
</div>
</div>最佳答案
在函数中传递参数和接收参数很复杂。更好的选择是编写一个函数并使用相应的 id 或选择器获取这些值。
示例代码
function getvalue() {
var fval = document.getElementById('category_name').value;
alert(fval);
var sval = document.getElementById('album_name').value;
alert(sval);
}<body>
<div class="col-xs-6 col-sm-6 col-md-4 col-md-offset-1">
<div class="form-group">
<select class="form-control" id="category_name">
<option value="" selected>Please Select</option>
<option value="Birds">Birds</option>
<option value="Notinlist">Category Not in list</option>
</select>
</div>
</div>
<div class="col-xs-6 col-sm-6 col-md-4 col-md-offset-1">
<div class="form-group">
<select class="form-control" id="album_name" onchange="getvalue();">
<option value="" selected>Please Select</option>
<option value="Dove">Dove</option>
<option value="Parrot">Parrot</option>
<option value="Notinlist">Category Not in list</option>
</select>
</div>
</div>
</body>关于javascript - 如何在javascript函数onChange中传递两个参数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35666890/