JavaScript函数未触发

Question

我有2个主要函数，除了变量名和它使用的表外，它们几乎完全相同。

我正在使用phonegap，html，javascript，JQuery Mobile。

当出现第一个警报时，将达到eventSoccer函数，但是未存储数据输入，而是仅刷新页面。

函数registerUser可以正常工作，向其显示sql查询，并显示警报“用户已注册”，并且数据在数据库中。

谁能确定为什么eventSoccer函数似乎不起作用？ 由于两个功能几乎完美无缺。

eventSoccer-

function eventSoccer() {
    alert("eventSoccer hit");
    var TitleT = document.getElementById("txttitle").value;
    var LocationL = document.getElementById("txtlocation").value;
    var PeopleP = document.getElementById("txtpeople").value;
    var DateD = document.getElementById("txtdate").value;
    var DescriptionD = document.getElementById("txtdesc").value;

    db = window.openDatabase("SoccerEarth", "2.0", "SoccerEarthDB", 2 * 1024 * 1024);
    db.transaction(function(tx) {
        NewSoccer(tx, TitleT, LocationL, PeopleP, DateD, DescriptionD);
    }, errorEvent, successEvent);
}

function NewSoccer(tx, TitleT, LocationL, PeopleP, DateD, DescriptionD) {
    var _Query = ("INSERT INTO SoccerEvents(Title, Location, NoPeople, Date, Description) values ('" + TitleT + "','" + LocationL + "','" + PeopleP + "','" + DateD + "', '" + DescriptionD + "')");
    alert(_Query);
    tx.executeSql(_Query);
}

function errorEvent(error) {
    navigator.notification.alert(error, null, "Event not created", "cool");
}

function successEvent() {
    navigator.notification.alert("The event has now been created", null, "Information", "ok");
}

registerUser-

function registerUser() {
    var Username = document.getElementById("txtusername").value;
    var Firstname = document.getElementById("txtfirstname").value;
    var Lastname = document.getElementById("txtlastname").value;
    var Email = document.getElementById("txtemail").value;
    var Password = document.getElementById("txtpassword").value;
    var Confirmpass = document.getElementById("passwordconfirm").value;

    db = window.openDatabase("SoccerEarth", "2.0", "SoccerEarthDB", 2 * 1024 * 1024);
    db.transaction(function(tx) {
        NewUser(tx, Username, Firstname, Lastname, Email, Password, Confirmpass);
    }, errorRegistration, successRegistration);
}

function NewUser(tx, Username, Firstname, Lastname, Email, Password, Confirmpass) {
    var _Query = ("INSERT INTO SoccerEarth(UserName, FirstName, LastName, Email, Password, CPass) values ('" + Username + "','" + Firstname + "','" + Lastname + "','" + Email + "', '" + Password + "', '" + Confirmpass + "')");
    alert(_Query);
    tx.executeSql(_Query);
}

function errorRegistration(error) {
    navigator.notification.alert(error, null, "Got an error mate", "cool");
}

function successRegistration() {
    navigator.notification.alert("User data has been registered", null, "Information", "ok");
}

HTML-

<div data-role="content">
    <br>
    <form>
        <label for="txttitle">Title</label>
        <input type="text" id="txttitle">
        <br>
        <label for="txtlocation">Location</label>
        <input type="text" id="txtlocation">
        <br>
        <label for="txtpeople">Number Of People</label>
        <input type="text" id="txtpeople">
        <br>
        <label for="txtdate">Date</label>
        <input type="text" id="txtdate">
        <br>
        <label for="textdesc">Description</label>
             <textarea name="textarea" id="textdesc"></textarea>
        <br>
        <input type="submit" value="submit" onclick="return eventSoccer()">
    </form>
</div>

Answer 1

我认为它在这里中断：

var DescriptionD = document.getElementById("txtdesc").value;

的document.getElementById（ “txtdesc”）= NULL，becase的存在在你的HTML没有'txtdesc'（你有'T E xtdesc'）

因此，我们有document.getElementById（“ txtdesc”）。value <=> null .value- 肯定会引发错误，并且会中断正常执行代码的过程。

顺便说一句-我不知道这实际上如何工作：

<input type="submit" value="submit" onclick="return eventSoccer()">

我至少会以这种形式编写它：

<input type="submit" value="submit" onclick="eventSoccer(); return false;">

这样提交单击就不会发送表单？ 还是您打算发送表格？ 无论如何-这是您的选择。