2

没有查询！我希望能够刷新页面并将下拉列表的值重置为空白（第一个选项）。但是，如果我去页面填写一些内容并刷新页面，它会保留以前在下拉列表中的选项文本。有谁知道如何实现这一目标？

这是我正在使用的下拉菜单。如果您想查看所有代码，我可以发布它。

<select style="float:left;" id="leave" onchange="changeMessage(this);">
      <option value="0"></option>
      <option value="5">Get Married</option>
      <option value="100">Have a Baby</option>
      <option value="90">Adopt a Child</option>
      <option value="35">Retire</option>
      <option value="15">Military Leave</option>
      <option value="25">Medical Leave</option>
</select>

这是所有的代码...

<html>
<head>
<title>Life Event Picker Calendar</title>
<script>
function changeMessage(oElement) {
    var rd1 = document.getElementById("rd1");
    var rd1Text = rd1.parentNode.getElementsByTagName('span')[0];
    var rd2 = document.getElementById("rd2");
    var rd2Text = rd2.parentNode.getElementsByTagName('span')[0];

    document.getElementById("message1").innerHTML = "";
    document.getElementById("message2").innerHTML = "";
    document.getElementById("message3").innerHTML = "";
    document.getElementById("message4").innerHTML = "";
    document.getElementById("message5").innerHTML = "";

    rd1.checked = false;
    rd2.checked = false;
    //nothing
    if (oElement.value == "0") {
        document.getElementById("btn").style.display = "none";
        document.getElementById("radio").style.display = "none";
        document.getElementById("day").innerHTML = "Date";
    //have a baby
    } else if (oElement.value == "100") {
        document.getElementById("btn").style.display = "none";
        document.getElementById("radio").style.clear = "both";
        document.getElementById("radio").style.display = "inline-block";
        rd1Text.innerHTML = "C-Section";
        rd2Text.innerHTML = "Regular Birth";
        rd1.value = "C-Section";
        rd2.value = "Regular Birth";
        document.getElementById("day").innerHTML = "Anticipated Due Date";
    //military leave
    } else if (oElement.value == "15") {
        document.getElementById("btn").style.display = "none";
        document.getElementById("radio").style.clear = "both";
        document.getElementById("radio").style.display = "inline-block";
        rd1Text.innerHTML = "Training";
        rd2Text.innerHTML = "Active Duty";
        rd1.value = "Training";
        rd2.value = "Active Duty";
        document.getElementById("day").innerHTML = "Anticipated Leave Date";
    //get married
    } else if (oElement.value == "5") {
        document.getElementById("btn").style.display = "inline-block";
        document.getElementById("radio").style.display = "none";
        document.getElementById("day").innerHTML = "Marriage Date";
    //adopt a child
    } else if (oElement.value == "90") {
        document.getElementById("btn").style.display = "inline-block";
        document.getElementById("radio").style.display = "none";
        document.getElementById("day").innerHTML = "Anticipated Adoption Date";
    //retire
    } else if (oElement.value == "35") {
        document.getElementById("btn").style.display = "inline-block";
        document.getElementById("radio").style.display = "none";
        document.getElementById("day").innerHTML = "Anticipated Retirement Date";
    //medical leave
    } else if (oElement.value == "25") {
        document.getElementById("btn").style.display = "inline-block";
        document.getElementById("radio").style.display = "none";
        document.getElementById("day").innerHTML = "Anticipated Disability Date";       
    } else {}
    return;
}

function showChoice(input) {
    document.getElementById("btn").style.display = "inline-block";
}

//gets info picked and displays messages
function getInfo() {
    var myDate=new Date();
    var ev_num = parseInt(document.getElementById("leave").value)
    myDate.setFullYear(sel_year.value,sel_month.value,sel_day.value);
    var event_value = document.getElementById("leave").value;

    //get married
    if (event_value == 5) {
        var first_number = new Date(myDate);
        first_number.setDate(myDate.getDate() + 31);
        document.getElementById("message1").innerHTML = "From " + myDate + " through " + first_number + "<br/>" + "You are eligible to update coverage and personal information through your 'Get Married' Life Event.";
        document.getElementById("message2").innerHTML = "";
        document.getElementById("message3").innerHTML = "";
        document.getElementById("message4").innerHTML = "";
        document.getElementById("message5").innerHTML = "";

    //have a baby
    } else if (event_value == 100) {
        var first_number = new Date(myDate);
        first_number.setDate(myDate.getDate() + 31);
        var second_number = new Date(myDate);
        second_number.setDate(myDate.getDate() - 30);
        var third_number = new Date(myDate);
        third_number.setDate(myDate.getDate() + 7);

        document.getElementById("message1").innerHTML = "From " + myDate + " through " + first_number + "<br/>" + "You are eligible to update coverage and personal information through your 'Have a Baby' Life Event.";
        document.getElementById("message2").innerHTML = "From " + second_number + " through " + myDate + "<br/>" + "1) Call 1-877-968-7762 to initiate your leave. <br/>" + "2) Complete Authorization Release Form.";
        document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>Contact a Leave Specialist at the HR Service Center to request paid days if not enough Occasional Absence days.";

        var fourth_number;
        var fifth_number1;
        var fifth_number2;
        //C Section 
        if ((document.getElementById("rd1").checked) == true) {
            fourth_number = new Date(myDate);
            fourth_number.setDate(myDate.getDate() + 56);
            fifth_number1 = new Date(myDate);
            fifth_number1.setDate(myDate.getDate() + 57);
            fifth_number2 = new Date(myDate);
            fifth_number2.setDate(myDate.getDate() + 91);

            document.getElementById("message4").innerHTML = myDate + " up to " + fourth_number + "<br/>1) Benefits deducted from STD pay.<br/>2) Checkpoint to determine return to work date.";
            document.getElementById("message5").innerHTML = fifth_number1 + " up to " + fifth_number2 + "<br/>1) Paid time off is up to five paid days.<br/>2) FML job protection is up to 13 weeks.<br/>3) Benefit bill sent once STD ends.";

        //Regular Birth
        } else {
            fourth_number = new Date(myDate);
            fourth_number.setDate(myDate.getDate() + 42);
            fifth_number1 = new Date(myDate);
            fifth_number1.setDate(myDate.getDate() + 43);
            fifth_number2 = new Date(myDate);
            fifth_number2.setDate(myDate.getDate() + 91);

            document.getElementById("message4").innerHTML = "From " + myDate + " through " + fourth_number + "<br/>1) Benefits deducted from STD pay.<br/>Checkpoint to determine return to work date.";
            document.getElementById("message5").innerHTML = fifth_number1 + " up to " + fifth_number2 + "<br/>1) Paid time off is up to five paid days.<br/>2) FML job protection is up to 13 weeks.<br/>3) Benefit bill sent once STD ends.";
        }

    //adopt a child 
    } else if (event_value == 90) {
        var first_number = new Date(myDate);
        first_number.setDate(myDate.getDate() + 31);
        var second_number = new Date(myDate);
        second_number.setDate(myDate.getDate() - 30);
        var third_number = new Date(myDate);
        third_number.setDate(myDate.getDate() + 91);

        document.getElementById("message1").innerHTML = "From " + myDate + " through " + first_number + "<br/>" + "You are eligible to update coverage and personal information through your 'Have a Child' Life Event.";
        document.getElementById("message2").innerHTML = "From " + second_number + " through " + myDate + "<br/>" + "Call 1-877-968-7762 to initiate your leave.";
        document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>1) Adoption time off is up to 10 paid days.<br/>2) FML job protection up to 13 weeks.";
        document.getElementById("message4").innerHTML = "";
        document.getElementById("message5").innerHTML = "";

    //retire
    } else if (event_value == 35) {
        var second_number = new Date(myDate);
        second_number.setDate(myDate.getDate() - 90);
        var third_number = new Date(myDate);
        third_number.setDate(myDate.getDate() + 30);
        var fourth_number = new Date(myDate);
        fourth_number.setDate(myDate.getDate() + 60);

        document.getElementById("message1").innerHTML = "";
        document.getElementById("message2").innerHTML = "From " + second_number + " through " + myDate + "<br/>Call 1-877-968-7762 to initiate your retirement.<br/>2) Make Pension election/return form.<br/>3) Review Savings/401(k) Options.<br/>4) View Medical Options.<br/>5) Review/Confirm beneficiaries.";
        document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>Enroll in Medical Plan Options if applicable.";
        document.getElementById("message4").innerHTML = "From " + myDate + " through " + fourth_number + "<br/>1) Enroll in COBRA<br/>2) Payoff any 401(k) loans.";
        document.getElementById("message5").innerHTML = "";

    //military leave
    } else if (event_value == 15) {
        var second_number = new Date(myDate);
        second_number.setDate(myDate.getDate() - 30);
        var third_number
        var fourth_number;

        document.getElementById("message1").innerHTML = "";
        document.getElementById("message2").innerHTML = "From " + second_number + " through " + myDate + "<br/>Call 1-877-968-7762 to initiate your leave.";
        document.getElementById("message5").innerHTML = "";

        //Training Leave
        if ((document.getElementById("rd1").checked) == true) {
            third_number = new Date(myDate);
            third_number.setDate(myDate.getDate() + 14);
            fourth_number = new Date(myDate);
            fourth_number.setDate(myDate.getDate() + 15);

            document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>You are eligible to receive 100% pay.";
            document.getElementById("message4").innerHTML = "After " + fourth_number + "<br/>Your leave will be unpaid.";

        //Active Duty
        } else {
            third_number = new Date(myDate);
            third_number.setDate(myDate.getDate() + 365);

            document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>You are eligible to receive 50% pay.";
            document.getElementById("message4").innerHTML = "After " + third_number + "<br/>Your leave will be unpaid.";
        }

    //medical leave
    } else if (event_value == 25) {
        var first_number = new Date(myDate);
        first_number.setDate(myDate.getDate() + 31);
        var second_number = new Date(myDate);
        second_number.setDate(myDate.getDate() - 30);
        var third_number = new Date(myDate);
        third_number.setDate(myDate.getDate() + 7);
        var fourth_number = new Date(myDate);
        fourth_number.setDate(myDate.getDate() + 91);

        document.getElementById("message1").innerHTML = "From " + myDate + " through " + first_number + "<br/>You are eligible to update coverage and personal information through your 'Take Medical Leave' Life Event.";
        document.getElementById("message2").innerHTML = "From " + second_number + " through " + myDate + "<br/>1) Call 1-877-968-7762 to initiate your leave. <br/>2) Complete Authorization Release Form.";
        document.getElementById("message3").innerHTML = "From " + myDate + " through " + third_number + "<br/>Contact a Leave Specialist at the HR Service Center to request paid days if not enough Occasional Absence days.";
        document.getElementById("message4").innerHTML = "From " + myDate + " through " + fourth_number + "<br/>1) Benefits deducted from STD pay.<br/>2) Checkpoint to determine return to work date.";
        document.getElementById("message5").innerHTML = "After " + fourth_number + "<br/>Contact will be made to initiate the LTD application process prior to 92nd day.";



    } else {}
}
</script>
</head>
<body>

Life Event Picker Calendar<br>
<hr align="left" width="200px"/>
<div id="life" style="float:left;">Life Event</div><div id="day" style="display:float:left; margin-left:120px;">Date</div>

    <select style="float:left;" id="leave" onchange="changeMessage(this);">
          <option selected="selected"value="0"></option>
          <option value="5">Get Married</option>
          <option value="100">Have a Baby</option>
          <option value="90">Adopt a Child</option>
          <option value="35">Retire</option>
          <option value="15">Military Leave</option>
          <option value="25">Medical Leave</option>
    </select>    

<div id="calendar-container" style="float:left;" ></div>

    <button id="btn" style="display:none;" onclick="getInfo()"type="button">Process</button>

<br>
<div id="radio" style="display:none">
    <label><span></span><input type="radio" name="radio" id="rd1" value="" onclick="showChoice(this)"/></label>
    <label><span></span><input type="radio" name="radio" id="rd2" value="" onclick="showChoice(this)"/></label>
</div>

<br>
<div id="date"></div>
<div id="event"></div>
<div id="return"></div>
<div id="yourdate"></div>

<div id="message1"></div><br>
<div id="message2"></div><br>
<div id="message3"></div><br>
<div id="message4"></div><br>
<div id="message5"></div>

<script type="text/javascript">
//creates the element variables for the drop downs
//need to be up here for getInfo() to work
var sel_year = document.createElement('select'),
    sel_month = document.createElement('select'),
    sel_day = document.createElement('select');


//function that creates id calendar-container
(function() {
    //variables and values for years
    var yr1 = 2011,
        yr2 = 2012,
        yr3 = 2013,
        yr4 = 2014;
    var years = [yr1, yr2, yr3, yr4];
    //array with months and associated days
    var calendar = [
        ["January", 31], ["February", 28], ["March", 31], ["April", 30], ["May", 31], ["June", 30], ["July", 31], ["August", 31], ["September", 30],
        ["October", 31], ["November", 30], ["December", 31]],
        //this is the variable that accesses the content
        cont = document.getElementById('calendar-container');

    //creates year/month/day options and sets their values (month value is -1 for date calculation)
    function createOption(txt, val) {
        var option = document.createElement('option');
        option.value = val;
        option.appendChild(document.createTextNode(txt));
        return option;
    }

    //this clears any elements for days, months, years
    function clearChildren(ele) {
        while (ele.hasChildNodes()) {
            ele.removeChild(ele.lastChild);
        }
    }

    //this function is triggered when you change the year or month
    function recalculateDays() {
        var year_index = sel_year.value;
        var month_index = sel_month.value,
            df = document.createDocumentFragment();
        if ((month_index == 1) && (year_index % 4 == 0)) {
            for (var i = 0, l = calendar[month_index][1]; i < l + 1; i++) {
                //the first variable is what number will be displayed in the day drop down
                df.appendChild(createOption(i + 1, i + 1));
            }
        } else {
            //l is the variable for the number of days in the month from the array above ex:28, 30, 31
            for (var i = 0, l = calendar[month_index][1]; i < l; i++) {
                //the first variable is what number will be displayed in the day drop down
                df.appendChild(createOption(i + 1, i + 1));
            }
        }
        clearChildren(sel_day);
        sel_day.appendChild(df);
    }

    //this creates the month values
    function generateMonths() {
        var df = document.createDocumentFragment();
        for (var i = 0; i < calendar.length; i++) {
            df.appendChild(createOption(calendar[i][0], i));
        }
        //clears past months
        clearChildren(sel_month);
        //appends new months onto variable df
        sel_month.appendChild(df);
    }

    //this creates the year values
    function generateYears() {
        var df = document.createDocumentFragment();
        for (var i = 0; i < years.length; i++) {
            df.appendChild(createOption(years[i], years[i]));
        }
        //clears past months
        clearChildren(sel_year);
        //appends new months onto variable df
        sel_year.appendChild(df);
    }

    //anytime the month/year selector is changed this calls the function to change the days
    sel_month.onchange = recalculateDays;
    sel_year.onchange = recalculateDays;

    //runs the months and days functions
    generateYears();
    generateMonths();
    recalculateDays();

    //this is what displays each of the individual drop downs after everything has been done to them
    cont.appendChild(sel_year);
    cont.appendChild(sel_month);
    cont.appendChild(sel_day);

}());

</script>

</body>
</html>
4

5 回答 5

3

试试这个：

<body onLoad="document.getElementById('leave').options[0].selected = 'selected';">
于 2012-08-24T15:34:26.123 回答
2

这是不使用 javascript hacks 的解决方案：

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="utf-8">
    <title>Example</title>
    </head>
        <body>
        <select autocomplete="off">
          <option value="0" selected="selected"></option>
          <option value="5">Get Married</option>
          <option value="100">Have a Baby</option>
          <option value="90">Adopt a Child</option>
          <option value="35">Retire</option>
          <option value="15">Military Leave</option>
          <option value="25">Medical Leave</option>
        </select>

        <br /><br />

        <button id="btn" onclick="javascript:location.reload(true)" type="button">Test page reloading</button>


        </body>
        </html>

编辑

进行了一些测试并添加了重新加载按钮来测试页面是否使用 javascript 或任何从您的代码触发的内容重新加载 - 它适用于我迄今为止测试的每个浏览器。（值设置为默认值）。使用 IE，它似乎有自己的方式来处理缓存，所以普通的 F5 不像其他浏览器那样工作（对于 IE 来说很典型） - 但是我提供的解决方案往往适用于页面由 js 刷新的常见 Web 开发，导航或表单发送等（网页上的基本用户操作。）

于 2012-08-24T15:20:41.493 回答
1

不知道我是否理解，但尝试简单：

<option value="0" SELECTED></option>
于 2012-08-24T15:17:37.267 回答
0

只需循环元素并重置它们：

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
function resetSelect(element){
    var reset = parseInt(element.dataset.reset, 10);
    element.selectedIndex = isNaN(reset) ? 0 : reset;
}
function resetSelects(){
    var els = document.getElementsByClassName('reset') || [];
    for (var i = els.length; i--;){
        if (els[i] && els[i].options)
            resetSelect(els[i]);
    }
}
window.onload = function(){
    resetSelects();
};
</script>
</head>
<body>

<select class='reset' data-reset='0' style="float:left;" id="leave" onchange="changeMessage(this);">
      <option value="0"></option>
      <option value="5">Get Married</option>
      <option value="100">Have a Baby</option>
      <option value="90">Adopt a Child</option>
      <option value="35">Retire</option>
      <option value="15">Military Leave</option>
      <option value="25">Medical Leave</option>
</select>   

</body>
</html>
于 2012-08-24T15:38:17.280 回答
0

将 myform 替换为她的表单名称：

Window.onload = function(){
    Myform.reset();
}

问候

于 2019-03-26T17:01:57.623 回答