Javascript 使用confirm() 作为if 的条件？
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Use confirm() as a condition to if?
提问by Guffa
I have this function:
我有这个功能：
function RemoveProduct() {
if (confirm("Poista?") == return true) {
return true;
} else {
return false;
}
}
When you click a "remove" button on the page, it should ask if it should remove a product, and if the answer is yes, it will remove it.
当您单击页面上的“删除”按钮时，它应该询问是否应该删除产品，如果答案是肯定的，它将删除它。
But as far as I know, I can't use another brackets on the if sentence conditions? How this should be done?
但据我所知，我不能在 if 语句条件上使用另一个括号？这应该怎么做？
回答by Guffa
When you compare a return value to trueyou shouldn't use return true, just true:
当您将返回值与true您不应该使用的值进行比较时return true，只需true：
function RemoveProduct() {
if (confirm("Poista?") == true) {
return true;
} else {
return false;
}
}
You don't even need to do the comparison, as the result from confirmis a boolean value:
您甚至不需要进行比较，因为结果confirm是一个布尔值：
function RemoveProduct() {
if (confirm("Poista?")) {
return true;
} else {
return false;
}
}
And you don't even need the ifstatement, you can just return the result from confirm:
而且您甚至不需要该if语句，您只需从confirm以下位置返回结果：
function RemoveProduct() {
return confirm("Poista?");
}
Remember to use returnwhen you use the function in an event. Example:
请记住return在事件中使用该函数时使用。例子：
<input type="submit" onclick="return RemoveProduct();" />
回答by hvgotcodes
But as far as I know, I can't use another brackets on the if sentence conditions?
但据我所知，我不能在 if 语句条件上使用另一个括号？
There is nothing that prevents you from executing a function within an if condition. That said, I always get all the arguments to my conditional settled before the if, for clarity and readability.
没有什么可以阻止您在 if 条件内执行函数。也就是说，为了清晰和可读性，我总是在 if 之前解决我的条件的所有参数。
Here is your code greatly simplified.
这是您的代码大大简化。
var confirmed = confirm('whatever');
return confirmed;
回答by Per Salbark
confirm()returns a boolean value and you can return that. Like so:
confirm()返回一个布尔值，你可以返回它。像这样：
function RemoveProduct() {
return confirm("Poista?");
}
回答by Govind Malviya
just use
只是使用
<a onclick="return confirm('ARe sure want to remove');">remove</a>
