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<td >Qt 5.12</td><td ><a href="qtqml-index.html">Qt QML</a></td><td ><a href="qtqml-module.html">C++ Classes</a></td><td >QJSValueIterator</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtqml-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QJSValueIterator Class</h1>
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<p>The <a href="qjsvalueiterator.html">QJSValueIterator</a> class provides a Java-style iterator for <a href="qjsvalue.html">QJSValue</a>. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QJSValueIterator></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += qml</td></tr></table></div><ul>
<li><a href="qjsvalueiterator-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#QJSValueIterator">QJSValueIterator</a></b>(const QJSValue &<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#dtor.QJSValueIterator">~QJSValueIterator</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#hasNext">hasNext</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#name">name</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#next">next</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJSValue </td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#value">value</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJSValueIterator &</td><td class="memItemRight bottomAlign"><b><a href="qjsvalueiterator.html#operator-eq">operator=</a></b>(QJSValue &<i>object</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qjsvalueiterator.html">QJSValueIterator</a> class provides a Java-style iterator for <a href="qjsvalue.html">QJSValue</a>.</p>
<p>The <a href="qjsvalueiterator.html">QJSValueIterator</a> constructor takes a <a href="qjsvalue.html">QJSValue</a> as argument. After construction, the iterator is located at the very beginning of the sequence of properties. Here's how to iterate over all the properties of a <a href="qjsvalue.html">QJSValue</a>:</p>
<pre class="cpp">
<span class="type"><a href="qjsvalue.html">QJSValue</a></span> object;
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="type"><a href="qjsvalueiterator.html#QJSValueIterator">QJSValueIterator</a></span> it(object);
<span class="keyword">while</span> (it<span class="operator">.</span>hasNext()) {
it<span class="operator">.</span>next();
qDebug() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>name() <span class="operator"><</span><span class="operator"><</span> <span class="string">": "</span> <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>value()<span class="operator">.</span>toString();
}
</pre>
<p>The <a href="qjsvalueiterator.html#next">next</a>() advances the iterator. The <a href="qjsvalueiterator.html#name">name</a>() and <a href="qjsvalueiterator.html#value">value</a>() functions return the name and value of the last item that was jumped over.</p>
<p>Note that <a href="qjsvalueiterator.html">QJSValueIterator</a> only iterates over the <a href="qjsvalue.html">QJSValue</a>'s own properties; i.e. it does not follow the prototype chain. You can use a loop like this to follow the prototype chain:</p>
<pre class="cpp">
<span class="type"><a href="qjsvalue.html">QJSValue</a></span> obj <span class="operator">=</span> <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>; <span class="comment">// the object to iterate over</span>
<span class="keyword">while</span> (obj<span class="operator">.</span>isObject()) {
<span class="type"><a href="qjsvalueiterator.html#QJSValueIterator">QJSValueIterator</a></span> it(obj);
<span class="keyword">while</span> (it<span class="operator">.</span>hasNext()) {
it<span class="operator">.</span>next();
qDebug() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>name();
}
obj <span class="operator">=</span> obj<span class="operator">.</span>prototype();
}
</pre>
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<p><b>See also </b><a href="qjsvalue.html#property">QJSValue::property</a>().</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QJSValueIterator"><a name="QJSValueIterator"></a>QJSValueIterator::<span class="name">QJSValueIterator</span>(const <span class="type"><a href="qjsvalue.html">QJSValue</a></span> &<i>object</i>)</h3>
<p>Constructs an iterator for traversing <i>object</i>. The iterator is set to be at the front of the sequence of properties (before the first property).</p>
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<h3 class="fn" id="dtor.QJSValueIterator"><a name="dtor.QJSValueIterator"></a>QJSValueIterator::<span class="name">~QJSValueIterator</span>()</h3>
<p>Destroys the iterator.</p>
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<h3 class="fn" id="hasNext"><a name="hasNext"></a><span class="type">bool</span> QJSValueIterator::<span class="name">hasNext</span>() const</h3>
<p>Returns true if there is at least one item ahead of the iterator (i.e. the iterator is <i>not</i> at the back of the property sequence); otherwise returns false.</p>
<p><b>See also </b><a href="qjsvalueiterator.html#next">next</a>().</p>
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<h3 class="fn" id="name"><a name="name"></a><span class="type">QString</span> QJSValueIterator::<span class="name">name</span>() const</h3>
<p>Returns the name of the last property that was jumped over using <a href="qjsvalueiterator.html#next">next</a>().</p>
<p><b>See also </b><a href="qjsvalueiterator.html#value">value</a>().</p>
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<h3 class="fn" id="next"><a name="next"></a><span class="type">bool</span> QJSValueIterator::<span class="name">next</span>()</h3>
<p>Advances the iterator by one position. Returns true if there was at least one item ahead of the iterator (i.e. the iterator was <i>not</i> already at the back of the property sequence); otherwise returns false.</p>
<p><b>See also </b><a href="qjsvalueiterator.html#hasNext">hasNext</a>() and <a href="qjsvalueiterator.html#name">name</a>().</p>
<!-- @@@next -->
<!-- $$$value[overload1]$$$value -->
<h3 class="fn" id="value"><a name="value"></a><span class="type"><a href="qjsvalue.html">QJSValue</a></span> QJSValueIterator::<span class="name">value</span>() const</h3>
<p>Returns the value of the last property that was jumped over using <a href="qjsvalueiterator.html#next">next</a>().</p>
<p><b>See also </b><a href="qjsvalueiterator.html#name">name</a>().</p>
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<h3 class="fn" id="operator-eq"><a name="operator-eq"></a><span class="type"><a href="qjsvalueiterator.html#QJSValueIterator">QJSValueIterator</a></span> &QJSValueIterator::<span class="name">operator=</span>(<span class="type"><a href="qjsvalue.html">QJSValue</a></span> &<i>object</i>)</h3>
<p>Makes the iterator operate on <i>object</i>. The iterator is set to be at the front of the sequence of properties (before the first property).</p>
<!-- @@@operator= -->
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