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javascript - 值从 html 下拉列表传递到 javascript

转载 作者:行者123 更新时间:2023-11-29 18:31:58 25 4
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我正在尝试将值从 jsp 传递到 javascript 但它崩溃说值未定义

我的下拉代码:

<html:select  name="AuthoringForm" property="disease_name" size="1" onchange="javascript:onchange_action()" >
<option selected="selected"> </option>
<option value="Malaria">Malaria</option>
<option value="High Fever">High Fever</option>
<option value="Cholera">Cholera</option>
</html:select></p>

Java脚本:

function onchange_action()
{
var e=document.getElementsByName("AuthoringForm");
alert("the value of the option here is "+e);
decisiontree.dieasenameencode=e;
}

警报说:

the value of the option here is undifined 

我的jsp:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@taglib uri="/WEB-INF/struts-nested.tld" prefix="nested" %>
<%
response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>

<html>
<head>
<script src="javascript/display_toggle.js" type="text/javascript"></script>
<script src="javascript/onchange_action.js" type="text/javascript"></script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>IDOC AUTHORING TOOL</title>
</head>
<body>
<p>
<u> </u><font size="7"><u>IDOC AUTHORING TOOL</u></font></p>
<p></p>
<p>Choose Authoring Mode :
<select size="1" name="AuthoringOption" id="AuthoringOption" onchange="javascript:display_toggle()">
<option selected="selected"> </option>
<option value ="1">Input Desicion Tree</option>
<option value ="2">Input Prevention</option>
<option value ="3">Input Symptoms</option>
<option value ="4">Input Prescription</option>
</select>
</p>



<div id="BasePage" style="display:block;" >
<p>Enter/Choose ailment :
<select size="1">
<option>Malaria</option>
<option>High Fever</option>
<option>Cholera</option>
</select></p>

<fieldset style="width: 381px; height: 126px; padding: 2">
<legend align="left"></legend>
Tick off patient context :
<input type="radio" value="V1" checked name="R1">Men
<input type="radio" name="R1" value="V2">Women
<p>
<input type="radio" name="R1" value="V3"> Child
<input type="radio" name="R1" value="V4"> All</p>
</fieldset>
<p>Enter Pre Conditions</p>
<p><textarea rows="2" cols="20"></textarea>
</div>


<!-- ______________________________________________________________________________________________________- -->


<div id="Symptoms" style="display:none;">
<html:form method="POST" action="symptoms" >
<!-- --- -->
<p></p>
<p>Enter/Choose ailment :
<html:select name="AuthoringForm" property="disease_name" size="1">
<option>Malaria</option>
<option>High Fever</option>
<option>Cholera</option>
</html:select></p>
<fieldset style="width: 381px; height: 126px; padding: 2">
<legend align="left"></legend>
Tick off patient context :
<html:radio value="Men" name="AuthoringForm" property="patient_context" disabled="false"/>
Men
<html:radio value="Womwen" name="AuthoringForm" property="patient_context" disabled="false"/>
Women
<p>
<html:radio value="Child" name="AuthoringForm" property="patient_context" disabled="false"/>
Child
<html:radio value="Al" name="AuthoringForm" property="patient_context" disabled="false"/>
All
</fieldset>
<p>Enter Pre Conditions</p>
<p><html:textarea rows="2" name="AuthoringForm" cols="20" property="patient_precondition" ></html:textarea>


<!-- ---------- -->

<p>Must Have Symptoms :
May Have Symptoms :</p>
<p><html:textarea rows="2" name="AuthoringForm" cols="20" property="must_have_symptoms"></html:textarea>
<!-- <input type="submit" value="Submit" name="B2">-->
<html:textarea rows="2" name="AuthoringForm" cols="20" property="may_have_symptoms"></html:textarea>
<input type="submit" value="Submit" name="symptomsButton"><input type="reset" value="Reset" onclick="this.form.reset()"></p>
</html:form>
</div>

<!--___________________________________________________________________________________________ -->
<div id="Prevention" style="display:none;">
<html:form method="POST" action="prevention" >

<!-- ---------------------------------- -->
<p></p>
<p>Enter/Choose ailment :

<html:select name="AuthoringForm" property="disease_name" size="1">
<option>Malaria</option>
<option>High Fever</option>
<option>Cholera</option>
</html:select></p>



<fieldset style="width: 381px; height: 126px; padding: 2">
<legend align="left"></legend>
Tick off patient context :
<html:radio value="Men" name="AuthoringForm" property="patient_context" disabled="false"/>
Men
<html:radio value="Womwen" name="AuthoringForm" property="patient_context" disabled="false"/>
Women
<p>
<html:radio value="Child" name="AuthoringForm" property="patient_context" disabled="false"/>
Child
<html:radio value="Al" name="AuthoringForm" property="patient_context" disabled="false"/>
All
</fieldset>

<p>Enter Pre Conditions</p>

<p><html:textarea rows="2" name="AuthoringForm" cols="20" property="patient_precondition" ></html:textarea>


<!-- --------------------------------------------------- -->


<p>Input for Prevention :
</p>
<p><html:textarea rows="8" name="AuthoringForm" cols="79" property="prevention"></html:textarea>
<input type="submit" value="Submit" name="preventionButton"><input type="reset" value="Reset" onclick="this.form.reset()">
</p>
</html:form>
</div>


<!--____________________________________________________________________________________________ -->




<div id="decisiontree" style="display:none;">

<html:form method="POST" action="decisiontree" >
<!-- ------------------------------------------------ -->
<p></p>
<p>Enter/Choose ailment :

<!-- ------------------------------------ -->
<html:select name="AuthoringForm" property="disease_name" size="1" onchange="javascript:onchange_action()" >
<option value="Malaria">Malaria</option>
<option value="High Fever">High Fever</option>
<option value="Cholera">Cholera</option>
</html:select></p>

<!-- --------------------------------- -->

<fieldset style="width: 381px; height: 126px; padding: 2">
<legend align="left"></legend>
Tick off patient context :
<html:radio value="Men" name="AuthoringForm" property="patient_context" disabled="false"/>
Men
<html:radio value="Womwen" name="AuthoringForm" property="patient_context" disabled="false"/>
Women
<p>
<html:radio value="Child" name="AuthoringForm" property="patient_context" disabled="false"/>
Child
<html:radio value="Al" name="AuthoringForm" property="patient_context" disabled="false"/>
All
</fieldset>
<p>Enter Pre Conditions</p>
<p><html:textarea rows="2" name="AuthoringForm" cols="20" property="patient_precondition" ></html:textarea>

<!-- ------------------------------------------------ -->

<p>
</p>
<fieldset style="width: 1225px; height: 451px; padding: 2">
<legend>Decision Tree Preview </legend>

<applet id="decisiontree" code="com.vaannila.utility.dynamicTreeApplet.class" archive="./appletjars/dynamictree.jar, ./appletjars/prefuse.jar" width ="1000" height="500" >
</applet>
</fieldset><p>

</p>
<p>Enter Follow Up Questions :</p>

<html:textarea rows="4" name="AuthoringForm" cols="45" property="follow_up_questions" ></html:textarea>
<html:radio value="Yes" name="AuthoringForm" property="followupconsent" disabled="false"/>
Yes
<html:radio value="No" name="AuthoringForm" property="followupconsent" disabled="false"/>
No
<input type="submit" value="Submit" name="followupQuestionButton"><input type="reset" value="Reset" onclick="this.form.reset()"><p>
</p>
</html:form>
</div>
<!-- ______________________________________________________________________________________________________________________________-->

<div id="Prescription" style="display:none;">
<html:form method="POST" action="prescription" >

<!-- ---------------------------------- -->

<p></p>
<p>Enter/Choose ailment :
<html:select name="AuthoringForm" property="disease_name" size="1">
<option>Malaria</option>
<option>High Fever</option>
<option>Cholera</option>
</html:select></p>


<fieldset style="width: 381px; height: 126px; padding: 2">
<legend align="left"></legend>
Tick off patient context :
<html:radio value="Men" name="AuthoringForm" property="patient_context" disabled="false"/>
Men
<html:radio value="Womwen" name="AuthoringForm" property="patient_context" disabled="false"/>
Women
<p>
<html:radio value="Child" name="AuthoringForm" property="patient_context" disabled="false"/>
Child
<html:radio value="Al" name="AuthoringForm" property="patient_context" disabled="false"/>
All
</fieldset>

<p>Enter Pre Conditions</p>

<p><html:textarea rows="2" name="AuthoringForm" cols="20" property="patient_precondition" ></html:textarea>


<!-- --------------------------------------------------- -->


<p>Input for Prescription :
</p>
<p><html:textarea rows="8" name="AuthoringForm" cols="79" property="prescrption"></html:textarea>
<input type="submit" value="Submit" name="prescriptionButton" ><input type="reset" value="Reset" onclick="this.form.reset()">
</p>
</html:form>
</div>
</body>
</html>

最佳答案

你需要:

var e=document.getElementsByName("AuthoringForm")[0];
alert("the value of the option here is "+e.value);

完整代码:

<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="application/javascript">
function onchange_action()
{
var e=document.getElementsByName("AuthoringForm")[0];
alert("the value of the option here is "+e.value);
decisiontree.dieasenameencode=e;
}
</script>
</head>
<body>
<select name="AuthoringForm" property="disease_name" size="1" onchange="onchange_action();">
<option selected="selected"> </option>
<option value="Malaria">Malaria</option>
<option value="High Fever">High Fever</option>
<option value="Cholera">Cholera</option>
</select>
</body>
</html>

关于javascript - 值从 html 下拉列表传递到 javascript,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7226917/

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