为什么选择选项后该功能不会触发？

-1

我仍然是一个noob在这...我倒了这个代码片段，无法找到我的错误。我知道textareaREMARKSTEXTAREA被省略，因为我不觉得它是相关的。基本上，这是我正在开发的用于创建高端数据电路测试的工具。为什么选择选项后该功能不会触发？

<!-- BEGIN TEST PATTERNS DROPDOWN MENU --> 
 
<td style="text-align: center; width: 638px;"> 
 
    <select id="testingdropdownmenu"> 
 
    <option value="">MAKE A SELECTION</option> 
 
    <option value="1">RAN QRSS TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN FOR 3 MINUTES AND TESTING OKAY… ">RAN QRSS TEST PATTERN FOR 3 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN FOR 15 MINUTES AND TESTING OKAY… ">RAN QRSS TEST PATTERN FOR 15 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN AND FINDING ERRORS…">RAN QRSS TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="2">RAN ALL ZEROES TEST PATTERN FOR X SECONDS AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ZEROES TEST PATTERN FOR 30 SECONDS AND TESTING OKAY… ">RAN ALL ZEROES TEST PATTERN FOR 30 SECONDS AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ZEROES TEST PATTERN AND FINDING ERRORS…">RAN ALL ZEROES TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="3">RAN T-DALY TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN T-DALY TEST PATTERN AND FINDING ERRORS…">RAN T-DALY TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="4">RAN 1:8 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:8 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 1:8 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:8 TEST PATTERN AND FINDING ERRORS…">RAN 1:8 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="5">RAN 1:7 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:7 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 1:7 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:7 TEST PATTERN AND FINDING ERRORS…">RAN 1:7 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="6">RAN 2-IN-8 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 2-IN-8 TEST PATTERN AND FINDING ERRORS…">RAN 2-IN-8 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="7">RAN BRIDGETAP TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN BRIDGETAP TEST PATTERN AND FINDING ERRORS…">RAN BRIDGETAP TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="8">RAN ALL ONES TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ONES TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN ALL ONES TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ONES TEST PATTERN AND FINDING ERRORS…">RAN ALL ONES TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value=" RAN 3-IN-24 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 3-IN-24 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 3-IN-24 TEST PATTERN AND FINDING ERRORS…">RAN 3-IN-24 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value=" RAN MULTIPAT TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN MULTIPAT TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN MULTIPAT TEST PATTERN AND FINDING ERRORS…">RAN MULTIPAT TEST PATTERN AND FINDING ERRORS…</option> 
 
    </select> 
 
    <script> 
 
    var mytextbox = document.getElementById('REMARKSTEXTAREA'); 
 
    var mydropdown = document.getElementById('testingdropdownmenu'); 
 
    mydropdown.onchange = function() if (mydropdown != null) { 
 
     if (mydropdown.value == 1) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN QRSS TEST PATTERN FOR " + TIME + "MINUTES AND TESTING OKAY..."; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 2) { 
 
     var TIME = prompt("HOW MANY SECONDS DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN ALL ZEROES TEST PATTERN FOR " + TIME + " SECONDS AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 3) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN T-DALY TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 4) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN 1:8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 5) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN 1:7 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 6) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN 2-IN-8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 7) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN BRIDGETAP TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else if (mydropdown.value == 8) { 
 
     var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); 
 
     mytextbox.value = mytextbox.value + " RAN ALL ONES TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; 
 
     this.value = ""; 
 
     } else { 
 
     mytextbox.value = mytextbox.value + " " + mydropdown + "..."; 
 
     this.value = ""; 
 
     } 
 
    } 
 
    } 
 
    } 
 
    </script> 
 
</td> 
 
<!-- END TESTING PATTERNS MENU -->

来源

2016-09-24 John McGee

检查你的开发人员工具控制台错误 –

语法错误附近'（）的函数，如果（mydropdown！= NULL）{'。检查您的控制台的细节。 – techfoobar

^我建议通过控制台查看，然后你会看到大量的错误被提出。 – Li357

你的if语句打开和关闭括号不匹配。

用附加的代码替换脚本代码，它应该工作正常。

 <script> 
var mytextbox = document.getElementById('REMARKSTEXTAREA'); 
var mydropdown = document.getElementById('testingdropdownmenu'); 
mydropdown.onchange = function(){if (mydropdown != null) { 
if (mydropdown.value == 1) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN QRSS TEST PATTERN FOR " + TIME + "MINUTES AND TESTING OKAY..."; this.value = "";} 
else if (mydropdown.value == 2) { 
var TIME = prompt("HOW MANY SECONDS DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN ALL ZEROES TEST PATTERN FOR " + TIME + " SECONDS AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 3) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN T-DALY TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 4) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 1:8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 5) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 1:7 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 6) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 2-IN-8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 7) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN BRIDGETAP TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else if (mydropdown.value == 8) { 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN ALL ONES TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
else { 
mytextbox.value = mytextbox.value + " " + mydropdown + "..."; this.value = "";} 
} 
} 

     </script>

来源

2016-09-24 05:35:14

当我运行“[object HTMLSelectElement] ...”时，我一直在textarea中获得followig ...“......任何线索？ –

请提供完整的页面源代码，以便于调试， –

var mytextbox = document.getElementById('REMARKSTEXTAREA'); 
 
var mydropdown = document.getElementById('testingdropdownmenu'); 
 
mydropdown.onchange = function(){if (mydropdown != null) { 
 
if (mydropdown.value == 1) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN QRSS TEST PATTERN FOR " + TIME + "MINUTES AND TESTING OKAY..."; this.value = "";} 
 
else if (mydropdown.value == 2) { 
 
var TIME = prompt("HOW MANY SECONDS DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN ALL ZEROES TEST PATTERN FOR " + TIME + " SECONDS AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 3) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN T-DALY TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 4) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 1:8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 5) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 1:7 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 6) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN 2-IN-8 TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 7) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN BRIDGETAP TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else if (mydropdown.value == 8) { 
 
var TIME = prompt("HOW MANY MINUTES DID YOU RUN THE TEST PATTERN FOR?"); mytextbox.value = mytextbox.value + " RAN ALL ONES TEST PATTERN FOR " + TIME + " MINUTES AND TESTING OKAY…"; this.value = "";} 
 
else { 
 
mytextbox.value = mytextbox.value + " " + mydropdown + "..."; this.value = "";} 
 
} 
 
}

<!-- BEGIN TEST PATTERNS DROPDOWN MENU --> 
 
<td style="text-align: center; width: 638px;"> 
 
    <select id="testingdropdownmenu"> 
 
    <option value="">MAKE A SELECTION</option> 
 
    <option value="1">RAN QRSS TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN FOR 3 MINUTES AND TESTING OKAY… ">RAN QRSS TEST PATTERN FOR 3 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN FOR 15 MINUTES AND TESTING OKAY… ">RAN QRSS TEST PATTERN FOR 15 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN QRSS TEST PATTERN AND FINDING ERRORS…">RAN QRSS TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="2">RAN ALL ZEROES TEST PATTERN FOR X SECONDS AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ZEROES TEST PATTERN FOR 30 SECONDS AND TESTING OKAY… ">RAN ALL ZEROES TEST PATTERN FOR 30 SECONDS AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ZEROES TEST PATTERN AND FINDING ERRORS…">RAN ALL ZEROES TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="3">RAN T-DALY TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN T-DALY TEST PATTERN AND FINDING ERRORS…">RAN T-DALY TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="4">RAN 1:8 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:8 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 1:8 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:8 TEST PATTERN AND FINDING ERRORS…">RAN 1:8 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="5">RAN 1:7 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:7 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 1:7 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 1:7 TEST PATTERN AND FINDING ERRORS…">RAN 1:7 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="6">RAN 2-IN-8 TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 2-IN-8 TEST PATTERN AND FINDING ERRORS…">RAN 2-IN-8 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="7">RAN BRIDGETAP TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN BRIDGETAP TEST PATTERN AND FINDING ERRORS…">RAN BRIDGETAP TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value="8">RAN ALL ONES TEST PATTERN FOR X MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ONES TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN ALL ONES TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN ALL ONES TEST PATTERN AND FINDING ERRORS…">RAN ALL ONES TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value=" RAN 3-IN-24 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN 3-IN-24 TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN 3-IN-24 TEST PATTERN AND FINDING ERRORS…">RAN 3-IN-24 TEST PATTERN AND FINDING ERRORS…</option> 
 
    <option value=" RAN MULTIPAT TEST PATTERN FOR 5 MINUTES AND TESTING OKAY… ">RAN MULTIPAT TEST PATTERN FOR 5 MINUTES AND TESTING OKAY…</option> 
 
    <option value=" RAN MULTIPAT TEST PATTERN AND FINDING ERRORS…">RAN MULTIPAT TEST PATTERN AND FINDING ERRORS…</option> 
 
    </select> 
 
</td>

来源

2016-09-24 05:51:38

感谢球员们......我能够在你的帮助下完成工作。非常感激！！！！ –

为什么选择选项后该功能不会触发？

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