javascript - 警报未显示在我的 html 代码中

标签 javascript html

我已经计算出所有验证码 但我不太确定如何编码 提交表单前弹出提醒 但在验证完成后。漂亮的 我的很多警报哪些字段有错误，以及 什么时候没有显示错误 我提交这份表格。所有这一切都引导我去 尽管有错误，仍提交成功的页面。

<!DOCTYPE html>
<html>
<head>
    <title>Test</title>
    <meta charset="utf-8">
    <link href="css/style.css" rel="stylesheet">
</head>
<body>
<script>
function validateForm() {
var fName = document.forms["orderForm"].firstName.value;//first name validation
        if(fName==null || fName=="")
        {
            document.getElementById('firstNameError').innerHTML= "Please enter a first name.";
            return false;
        }


        var lName = document.forms["orderForm"].lastName.value;//last name validation
        if(lName==null || lName=="")
        {
            document.getElementById('lastNameError').innerHTML= "Please enter a last name.";
            return false;
        }


        var address = document.forms["orderForm"].address.value;//address validation
        if(address==null || address=="")
        {
            document.getElementById('addressError').innerHTML= "Please enter an address.";
            return false;
        }


        var city = document.forms["orderForm"].city.value;//city validation
        if(city==null || city=="")
        {
            document.getElementById('cityError').innerHTML= "Please enter a city.";
            return false;
        }


        var pCodeCheck = /^[0-9a-zA-Z]+$/;//postal code validation
        if(postalCode.value.match(pCodeCheck))
        {
            //do nothing
            return true;
        }
        else
        {
            document.getElementById('postalCoderror').innerHTML= "Please enter a valid postal code.";
            return false;
        }

                    // makes sure you cannot order a negative number of items


        var itemQTY = document.forms["orderForm"].widget1qty.value;
        if(itemQTY < 0)
        {
            document.getElementById('qtyError').innerHTML= "You cannot enter a negative number.";
            return false;
        }


        var itemQTY2 = document.forms["orderForm"].widget2qty.value;
        if(itemQTY2 < 0)
        {
            document.getElementById('qtyError2').innerHTML= "You cannot enter a negative number.";
            return false;
        }


        var itemQTY3 = document.forms["orderForm"].widget3qty.value;
        if(itemQTY3 < 0)
        {
            document.getElementById('qtyError3').innerHTML= "You cannot enter a negative number.";
            return false;
        }

                    //makes sure there is at least one item ordered
        var wid1Qty = document.getElementById('widget1qty').value;
        var wid2Qty = document.getElementById('widget2qty').value;
        var wid3Qty = document.getElementById('widget3qty').value;
        if(wid1Qty + wid2Qty + wid3Qty == 0)
        {
            document.getElementById('itemQTY').innerHTML= "You must order atleast one item.";
            return false;
        }
        var total1;
        var total2;
        var total3;
        var total4;

        total1 = document.forms['orderForm']['widget1qty'].value * 5;
        total2 = document.forms['orderForm']['widget2qty'].value * 15;
        total3 = document.forms['orderForm']['widget3qty'].value * 25;
        total4 = (total1 + total2 + total3)
        alert('Your total is: $' + total4 + '.00');
        return;
    }

function startValidate(){
        validateForm();
        document.forms['orderForm'].submit();

}
</script>
    <div id="wrapper">
    <h2 class="center">Order Form</h2> <!-- action="processForm.html"       "javascript:void(0)" -->
    <form name="orderForm" method="post" onsubmit="validate();" action="processForm.html">
    <fieldset>
    <legend>Personal Information</legend>
    <table>

        <tr>
            <th colspan="3"></th>
        </tr>
        <tr>
            <td><span class="required">*</span>First Name:</td>
            <td><input type="text" name="firstName" id="firstName" size="30"></td>
            <td id="firstNameError"></td>
        </tr>
        <tr>
            <td><span class="required">*</span>Last Name:</td>
            <td><input type="text" name="lastName" id="lastName" size="30"></td>
            <td id="lastNameError"></td>
        </tr>
        <tr>
            <td><span class="required">*</span>Address:</td>
            <td><input type="text" name="address" id="address" size="30"></td>
            <td id="addressError"></td>
        </tr>
        <tr>
            <td><span class="required">*</span>City:</td>
            <td><input type="text" name="city" id="city" size="30"></td>
            <td id="cityError"></td>
        </tr>
        <tr>
            <td><span class="required">*</span>Province:</td>
            <td><select name="province" id="province" size="1">
                    <option disabled>Select a province</option>
                    <option value="BC">British Columbia</option>
                    <option value="AB">Alberta</option>
                    <option value="SK">Saskatchewan</option>
                    <option value="MB">Manitoba</option>
                    <option value="ON">Ontario</option>
                    <option value="QC">Québec</option>
                    <option value="NB">New Brunswick</option>
                    <option value="NS">Nova Scotia</option>
                    <option value="PE">Prince Edward Island</option>
                    <option value="NF">Newfoundland</option>
                    <option value="YK">Yukon</option>
                    <option value="NWT">Northwest Territories</option>
                    <option value="NU">Nunavut</option>
                </select>
            </td>
            <td></td>
        </tr>
        <tr>
            <td><span class="required">*</span>Postal Code:</td>
            <td><input type="text" name="postalCode" id="postalCode" maxlength="6"></td>
            <td id="postalCoderror"></td>
        </tr>
        </table>
        </fieldset>
        <fieldset>
        <legend>Order Information</legend>

        <table>
        <tr>
            <th colspan="3"></th>
        </tr>
        <tr>
            <td rowspan="3">Select your products:<br>
            <td>Widget #1&nbsp;
                <input type="text" name="widget1qty" id="widget1qty" size="1" value="0">Qty @ <strong>$5.00/ea</strong></td>
                <td id="qtyError"></td>
        </tr>
        <tr>
            <td>Widget #2&nbsp;
                <input type="text" name="widget2qty" id="widget2qty" size="1" value="0">Qty @ <strong>$15.00/ea</strong></td>
                <td id="qtyError2"></td>
        </tr>
        <tr>
            <td>Widget #3&nbsp;
                <input type="text" name="widget3qty" id="widget3qty" size="1" value="0">Qty @ <strong>$25.00/ea</strong></td>
                <td id="qtyError3"></td>
        </tr>
        <tr>
        <td rowspan="3"></td>
        <td></td>
        <td id="itemQTY"></td>
        </tr>
        <tr></tr><tr></tr><tr></tr>
        <tr>
            <td rowspan="3">Shipping Type:</td>
            <td>Standard ($5.00)<input type="radio" name="shippingType" id="shippingTypeStandard" value="Standard" checked></td>

        </tr>
        <tr>
            <td>Express ($10.00)<input type="radio" name="shippingType" id="shippingTypeExpress" value="Express"></td>
        </tr>
        <tr>
            <td>Overnight ($20.00)<input type="radio" name="shippingType" id="shippingTypeOvernight" value="Overnight"></td>
        </tr>

        </table>
        </fieldset>
        <fieldset>
        <legend>Submit Order</legend>
        <table>
        <tr>
            <th colspan="2"></th>
        </tr>
        <tr>
        <input type="submit" name="btnSubmit" id="btnSubmit" onsubmit="startValidate()" value="Submit Order">
            <td><input type="reset" name="btnReset" id="btnReset" value="Reset Form"></td>
        </tr>
    </table>
    </fieldset>
    </form>
</div>  
</body>

最佳答案

这就是我要做的:

HTML:

<body>
    <div id="wrapper">
        <h2 class="center">Order Form</h2> <!-- action="processForm.html"       "javascript:void(0)" -->
        <form name="orderForm" method="post" action="processForm.html" onsubmit="return startValidate()">
            <fieldset>
                <legend>Personal Information</legend>
                <table>

                    <tr>
                        <th colspan="3"></th>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>First Name:</td>
                        <td><input type="text" name="firstName" id="firstName" size="30"></td>
                        <td id="firstNameError"></td>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>Last Name:</td>
                        <td><input type="text" name="lastName" id="lastName" size="30"></td>
                        <td id="lastNameError"></td>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>Address:</td>
                        <td><input type="text" name="address" id="address" size="30"></td>
                        <td id="addressError"></td>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>City:</td>
                        <td><input type="text" name="city" id="city" size="30"></td>
                        <td id="cityError"></td>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>Province:</td>
                        <td><select name="province" id="province" size="1">
                                <option disabled>Select a province</option>
                                <option value="BC">British Columbia</option>
                                <option value="AB">Alberta</option>
                                <option value="SK">Saskatchewan</option>
                                <option value="MB">Manitoba</option>
                                <option value="ON">Ontario</option>
                                <option value="QC">Québec</option>
                                <option value="NB">New Brunswick</option>
                                <option value="NS">Nova Scotia</option>
                                <option value="PE">Prince Edward Island</option>
                                <option value="NF">Newfoundland</option>
                                <option value="YK">Yukon</option>
                                <option value="NWT">Northwest Territories</option>
                                <option value="NU">Nunavut</option>
                            </select>
                        </td>
                        <td></td>
                    </tr>
                    <tr>
                        <td><span class="required">*</span>Postal Code:</td>
                        <td><input type="text" name="postalCode" id="postalCode" maxlength="6"></td>
                        <td id="postalCoderror"></td>
                    </tr>
                </table>
            </fieldset>
            <fieldset>
                <legend>Order Information</legend>

                <table>
                    <tr>
                        <th colspan="3"></th>
                    </tr>
                    <tr>
                        <td rowspan="3">Select your products:<br>
                        <td>Widget #1&nbsp;
                            <input type="text" name="widget1qty" id="widget1qty" size="1" value="0">Qty @ <strong>$5.00/ea</strong></td>
                        <td id="qtyError"></td>
                    </tr>
                    <tr>
                        <td>Widget #2&nbsp;
                            <input type="text" name="widget2qty" id="widget2qty" size="1" value="0">Qty @ <strong>$15.00/ea</strong></td>
                        <td id="qtyError2"></td>
                    </tr>
                    <tr>
                        <td>Widget #3&nbsp;
                            <input type="text" name="widget3qty" id="widget3qty" size="1" value="0">Qty @ <strong>$25.00/ea</strong></td>
                        <td id="qtyError3"></td>
                    </tr>
                    <tr>
                        <td rowspan="3"></td>
                        <td></td>
                        <td id="itemQTY"></td>
                    </tr>
                    <tr></tr><tr></tr><tr></tr>
                    <tr>
                        <td rowspan="3">Shipping Type:</td>
                        <td>Standard ($5.00)<input type="radio" name="shippingType" id="shippingTypeStandard" value="Standard" checked></td>

                    </tr>
                    <tr>
                        <td>Express ($10.00)<input type="radio" name="shippingType" id="shippingTypeExpress" value="Express"></td>
                    </tr>
                    <tr>
                        <td>Overnight ($20.00)<input type="radio" name="shippingType" id="shippingTypeOvernight" value="Overnight"></td>
                    </tr>

                </table>
            </fieldset>
            <fieldset>
                <legend>Submit Order</legend>
                <table>
                    <tr>
                        <th colspan="2"></th>
                    </tr>
                    <tr>
                    <input type="submit" name="btnSubmit" id="btnSubmit" value="Submit Order">
                    <td><input type="reset" name="btnReset" id="btnReset" value="Reset Form"></td>
                    </tr>
                </table>
            </fieldset>
        </form>
    </div>  
</body>

JS:

  <script>
    function validateForm() {
        var errors = 0;
        var fName = document.forms["orderForm"].firstName.value;//first name validation
        if (fName == null || fName == "")
        {
            document.getElementById('firstNameError').innerHTML = "Please enter a first name.";
            errors++;
        } else {
            document.getElementById('firstNameError').innerHTML = "";
        }


        var lName = document.forms["orderForm"].lastName.value;//last name validation
        if (lName == null || lName == "")
        {
            document.getElementById('lastNameError').innerHTML = "Please enter a last name.";
            errors++;
        } else {
            document.getElementById('lastNameError').innerHTML = "";
        }


        var address = document.forms["orderForm"].address.value;//address validation
        if (address == null || address == "")
        {
            document.getElementById('addressError').innerHTML = "Please enter an address.";
            errors++;
        } else {
            document.getElementById('addressError').innerHTML = "";
        }


        var city = document.forms["orderForm"].city.value;//city validation
        if (city == null || city == "")
        {
            document.getElementById('cityError').innerHTML = "Please enter a city.";
            errors++;
        } else {
            document.getElementById('cityError').innerHTML = "";
        }


        var pCodeCheck = /^[0-9a-zA-Z]+$/;//postal code validation
        if (postalCode.value.match(pCodeCheck))
        {
            document.getElementById('postalCoderror').innerHTML = "";
        }
        else
        {

            document.getElementById('postalCoderror').innerHTML = "Please enter a valid postal code.";
            errors++;
        }

        // makes sure you cannot order a negative number of items


        var itemQTY = document.forms["orderForm"].widget1qty.value;
        if (itemQTY < 0)
        {
            document.getElementById('qtyError').innerHTML = "You cannot enter a negative number.";
            errors++;
        } else {
            document.getElementById('qtyError').innerHTML = "";
        }


        var itemQTY2 = document.forms["orderForm"].widget2qty.value;
        if (itemQTY2 < 0)
        {
            document.getElementById('qtyError2').innerHTML = "You cannot enter a negative number.";
            errors++;
        } else {
            document.getElementById('qtyError2').innerHTML = "";
        }


        var itemQTY3 = document.forms["orderForm"].widget3qty.value;
        if (itemQTY3 < 0)
        {
            document.getElementById('qtyError3').innerHTML = "You cannot enter a negative number.";
            errors++;
        } else {
            document.getElementById('qtyError3').innerHTML = "";
        }

        //makes sure there is at least one item ordered
        var wid1Qty = document.getElementById('widget1qty').value;
        var wid2Qty = document.getElementById('widget2qty').value;
        var wid3Qty = document.getElementById('widget3qty').value;
        if (wid1Qty + wid2Qty + wid3Qty == 0)
        {
            document.getElementById('itemQTY').innerHTML = "You must order atleast one item.";
            errors++;
        } else {
            document.getElementById('itemQTY').innerHTML = "";
        }
        var total1;
        var total2;
        var total3;
        var total4;

        total1 = document.forms['orderForm']['widget1qty'].value * 5;
        total2 = document.forms['orderForm']['widget2qty'].value * 15;
        total3 = document.forms['orderForm']['widget3qty'].value * 25;
        total4 = (total1 + total2 + total3);
        alert('Your total is: $' + total4 + '.00');
        return errors;
    }

    function startValidate() {
        var errors = validateForm();
        if (errors == 0) {
            document.forms['orderForm'].submit();
        } else {
            return false;
        }
    }
</script>

关于javascript - 警报未显示在我的 html 代码中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26595326/

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