如何在 javascript 中使用带有多个下拉列表的 if else 语句？
[英]How to use if else statment in javascript with multiple drop-down list?
问题描述
I am trying to print select in multiple drop-down list, but prints only two words(CHENNAI AND IOS-XE, BANGALORE AND IOS-XR) could not print the remaining words Can anyone help me fix this?
我正在尝试在多个下拉列表中打印 select，但仅打印两个单词（CHENNAI 和 IOS-XE、BANGALORE 和 IOS-XR）无法打印剩余的单词有人可以帮我解决这个问题吗？
Required Output:所需 Output：
if i select CHENNAI+IOS-XE ---> output: CHENNAI AND IOS-XE如果我 select 钦奈+IOS-XE ---> output：钦奈和 IOS-XE
else if BANGALORE+IOS-XR ---> output: BANGALORE AND IOS-XR否则，如果班加罗尔+IOS-XR ---> output：班加罗尔和 IOS-XR
else if CHENNAI+IOS-XR ---> output: CHENNAI AND IOS-XR否则如果 CHENNAI+IOS-XR ---> output: CHENNAI 和 IOS-XR
else if BANGALORE+IOS-XE ---> output: BANGALORE AND IOS-XE否则如果 BANGALORE+IOS-XE ---> output: BANGALORE 和 IOS-XE
<html>
<body>
<p>SELECT THE REGION </p>
<select id="choose">
<option value="a1">CHENNAI</option>
<option value="b1">BANGALORE</option>
</select></p>
<p>SELECT THE ROUTER TYPE </p>
<select id="choose1">
<option value="a2">IOS-XE</option>
<option value="b2">IOS-XR</option>
</select></p>
<button onclick="button()">CLICK</button>
<script>
function button() {
var x = document.getElementById("choose").value;
var y = document.getElementById("choose1").value;
if (x == 'a1' || y == 'a2' ) {
document.write("CHENNAI AND IOS-XE");
}
else if (x == 'b1' || y == 'b2'){
document.write("BANGALORE AND IOS-XR");
}
else if (x == 'a1' || y == 'b2'){
document.write("CHENNAI AND IOS-XR");
}
else if (x == 'b1' || y == 'a2'){
document.write("BANGALORE AND IOS-XE");
}
}
</script>
</body>
</html>
2 个解决方案
解决方案1
1 已采纳 2020-08-01 11:57:22
Your else statement cannot contain a condition check.您的else语句不能包含条件检查。
You need to change the logic to the following:您需要将逻辑更改为以下内容：
if (x == 'a1') {
document.write("A SELECTED");
}
else if (x == 'b1'){
// ^ added this :)
document.write("B SELECTED");
}
解决方案2
1 2020-08-01 11:57:28
else shouldn't have any conditions in it, if you want to use a condition for it you should use else if : else里面不应该有任何条件，如果你想为它使用条件，你应该使用else if ：
else if ( x == 'b1' ) {
// Your statement
}
or you can use a general else for all other cases:或者您可以在所有其他情况下使用一般else ：
else {
// Your statement
}
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