Java - ajouter l'attribut à l'élément de formulaire printemps si true condition - Stack Overflow

So I got this checkbox:

<form:checkbox id="someCheckbox" path="someCheckbox"/>

Now I would like to add an attribute - specifically checked="checked" if a condition is true. Is this possible without wrapping the entire element in an if statement?

Basically what I want (results in an error):

<form:checkbox id="someCheckbox" path="someCheckbox" ${isChecked ? 'checked=checked' : ''}/>

Note that adding the attribute checked="", and making the value of it conditional will not work either, since checked=false or checked=' ' is treated as checked in modern browsers.

its better if you put the logic in controller

String checked=null;
if(condition)
checked="checked"
else
checked="";

modelMap.put("checkBoxChecked",checked);

return modelmap to view

and in view add as below

<form:checkbox id="someCheckbox" path="someCheckbox" ${checkBoxChecked}/>

Include core jstl tag in your jsp:

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

and then

    <input type="checkbox" name="someCheckbox" id="someCheckbox" <c:if test="${check your condition}">checked="checked"</c:if> /> 

This works for me in Tomcat 7/JSP 2.2/JSTL 1.2:

<form:checkbox id="someCheckbox" path="someCheckbox" 
    <c:if test="${isChecked}">
        checked="checked"
    </c:if> 
/>

Using the ternary operator like in your question should work with JSP >= 2.0:

<form:checkbox id="someCheckbox" path="someCheckbox" 
    ${isChecked ? "checked='checked'" : ""}
/>

Or you could use this:

<c:choose>
    <c:when test="${isChecked}">
        <c:set var="varChecked" value="checked='checked'"></c:set>
    </c:when>

    <c:otherwise>
        <c:set var="varChecked" value=""></c:set>
    </c:otherwise>
</c:choose>

<form:checkbox id="someCheckbox" path="someCheckbox" 
    ${varChecked}
/>

Still less verbose and redundant than wrapping the entire form-tag in a c:if-tag.

Obviously you'll need to include the core taglib for any of these to work.

Since form:checkbox is bind with form through path attribute, it's enough if you set the value in your form object.

Eventually do it with javascript

So I got this checkbox:

<form:checkbox id="someCheckbox" path="someCheckbox"/>

Now I would like to add an attribute - specifically checked="checked" if a condition is true. Is this possible without wrapping the entire element in an if statement?

Basically what I want (results in an error):

<form:checkbox id="someCheckbox" path="someCheckbox" ${isChecked ? 'checked=checked' : ''}/>

Note that adding the attribute checked="", and making the value of it conditional will not work either, since checked=false or checked=' ' is treated as checked in modern browsers.

its better if you put the logic in controller

String checked=null;
if(condition)
checked="checked"
else
checked="";

modelMap.put("checkBoxChecked",checked);

return modelmap to view

and in view add as below

<form:checkbox id="someCheckbox" path="someCheckbox" ${checkBoxChecked}/>

Include core jstl tag in your jsp:

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

and then

    <input type="checkbox" name="someCheckbox" id="someCheckbox" <c:if test="${check your condition}">checked="checked"</c:if> /> 

This works for me in Tomcat 7/JSP 2.2/JSTL 1.2:

<form:checkbox id="someCheckbox" path="someCheckbox" 
    <c:if test="${isChecked}">
        checked="checked"
    </c:if> 
/>

Using the ternary operator like in your question should work with JSP >= 2.0:

<form:checkbox id="someCheckbox" path="someCheckbox" 
    ${isChecked ? "checked='checked'" : ""}
/>

Or you could use this:

<c:choose>
    <c:when test="${isChecked}">
        <c:set var="varChecked" value="checked='checked'"></c:set>
    </c:when>

    <c:otherwise>
        <c:set var="varChecked" value=""></c:set>
    </c:otherwise>
</c:choose>

<form:checkbox id="someCheckbox" path="someCheckbox" 
    ${varChecked}
/>

Still less verbose and redundant than wrapping the entire form-tag in a c:if-tag.

Obviously you'll need to include the core taglib for any of these to work.

Since form:checkbox is bind with form through path attribute, it's enough if you set the value in your form object.

Eventually do it with javascript

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