所以我正在尝试使用 Javascript 将一个div 插入到另一个div 中,如果 2 个给定的密码不匹配。但是,每次我尝试运行它时,它都会在这篇文章的标题中抛出错误。我只希望div 在 2 个密码匹配时消失。
function passwordMismatchError(){
var pwrd1 = document.getElementById('password').value;
var pwrd2 = document.getElementById('password-confirmation').value;
if(pwrd1 != pwrd2){
// If there is an error box already
if(document.getElementById("password-mismatch-error")){
return;
}
// If there isn't an error box
else{
errcount++;
var innerdiv = document.createElement('div');
innerdiv.setAttribute("id", "password-mismatch-error");
innerdiv.innerHTML = "<p>ERROR: Passwords don't match.</p>";
(document.getElementById("error-display")).appendChild(innerdiv);
}
}
else{
// If the passwords match
errcount--;
var innerdiv = document.getElementById("password-mismatch-error");
console.log(innerdiv);
innerdiv.parentNode.removeChild(innerdiv);
return;
}
}
在外部else
语句中,#password-mismatch-error
永远不会添加到 DOM 中,因此innerdiv
将是未定义的。因此,您无法访问其parentNode
。
要解决此问题,只需检查该元素是否存在,然后再尝试使用 if(document.getElementById("password-mismatch-error"))
删除其父元素:
function passwordMismatchError(){
var pwrd1 = document.getElementById('password').value;
var pwrd2 = document.getElementById('password-confirmation').value;
if(pwrd1 != pwrd2){
// If there is an error box already
if(document.getElementById("password-mismatch-error")) {
return;
}
// If there isn't an error box
else{
errcount++;
var innerdiv = document.createElement('div');
innerdiv.setAttribute("id", "password-mismatch-error");
innerdiv.innerHTML = "<p>ERROR: Passwords don't match.</p>";
(document.getElementById("error-display")).appendChild(innerdiv);
}
}
else{
// If the passwords match
errcount--;
// Ensure the error message actually exists in the DOM
if(document.getElementById("password-mismatch-error")) {
var innerdiv = document.getElementById("password-mismatch-error");
console.log(innerdiv);
innerdiv.parentNode.removeChild(innerdiv);
}
return;
}
}
希望这有帮助! :)