gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<h1>TextBlocks</h1>
<p>
Use the <a>TextBlock</a> class to display text.
</p>
<p>
Setting the <a>TextBlock.text</a> property is the only way to show a text string.
Because TextBlock inherits from <a>GraphObject</a>, some GraphObject properties will affect text.
But there are additional text-only options regarding how that text is formatted and drawn.
</p>
<p>
In these simplistic demonstrations, the code programmatically creates a Part and adds it to the Diagram.
Once you learn about models and data binding you will generally not create parts (nodes or links) programmatically.
</p>
<h2 id="FontAndColors">Font and colors</h2>
<p>
The size and stylistic appearance of the text is specified by the <a>TextBlock.font</a>.
The value may be any CSS font specifier string.
</p>
<p>
The text is drawn using the <a>TextBlock.stroke</a> brush.
The value may be any CSS color string or a <a>Brush</a>.
By default the stroke is "black".
</p>
<p>
You can also specify the brush to use as the background: <a>GraphObject.background</a>.
This defaults to no brush at all, which results in a transparent background.
The background is always rectangular.
</p>
<p>
In these simplistic demonstrations, the code programmatically creates a Part and adds it to the Diagram.
Once you learn about models and data binding you will generally not create parts (nodes or links) programmatically.
</p>
<pre class="lang-js" id="basicTextBlocks"><code>
diagram.add(
$(go.Part, "Vertical",
$(go.TextBlock, { text: "a Text Block" }),
$(go.TextBlock, { text: "a Text Block", stroke: "red" }),
$(go.TextBlock, { text: "a Text Block", background: "lightblue" }),
$(go.TextBlock, { text: "a Text Block", font: "bold 14pt serif" })
));
</code></pre>
<script>goCode("basicTextBlocks", 600, 100)</script>
<h3 id="IconFonts">Icon Fonts</h3>
<p>
In some cases, you can show an icon that is provided by a font, instead of using a <a>Picture</a> or a <a>Shape</a>.
First, make sure the font is loaded in the page before creating the diagram.
</p>
<pre class="lang-html"><code>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</code></pre>
<pre class="lang-js" id="awesomeFont"><code>
diagram.add(
$(go.Node, "Auto",
$(go.Shape, { fill: "lightgreen" }),
$(go.Panel, "Horizontal",
{ margin: 8 },
$(go.TextBlock,
{ text: '\uf030', font: '10pt FontAwesome' }),
$(go.TextBlock, "an example using FontAwesome",
{ margin: new go.Margin(0, 0, 0, 2) })
)
));
</code></pre>
<script>goCode("awesomeFont", 600, 100)</script>
<h2 id="NaturalSizingOfTextBlocksVariesByBrowser">Natural Sizing of TextBlocks Varies by Browser</h2>
<p>
Because different browsers measure canvas text differently,
TextBlocks are the only objects in <b>GoJS</b> that may have inconsistent natural sizes between browsers or different devices.
For this reason, if you need objects to measure precisely and consistently across all browsers (such as when testing),
TextBlocks without an explicit size (<a>GraphObject.desiredSize</a> or <a>GraphObject.width</a> and <a>GraphObject.height</a>)
should not be used to dictate the size of any objects.
For example, if you have a TextBlock with natural size inside an <a>Panel.Auto</a> Panel,
set the size on that Auto Panel.
</p>
<h2 id="SizingAndClipping">Sizing and Clipping</h2>
<p>
The natural size of a <a>TextBlock</a> is just big enough to render the text string with the given font.
However the actual size of the TextBlock can be larger or smaller in either dimension.
Larger dimensions result in areas with no text; smaller dimensions result in clipping.
</p>
<p>
To demonstrate this, the examples below start with a naturally sized TextBlock,
followed by ones with decreasing explicit sizes.
To better show the actual size of the TextBlocks below, we have given them lightgreen backgrounds.
</p>
<pre class="lang-js" id="sizingTextBlocks"><code>
diagram.add(
$(go.Part, "Vertical",
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2 }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 100, height: 33 }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 60, height: 33 }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 50, height: 22 }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 40, height: 9 })
));
</code></pre>
<script>goCode("sizingTextBlocks", 600, 160)</script>
<h2 id="MaxLinesAndOverflow">Max Lines and Overflow</h2>
<p>
You can constrain the TextBlock's available size using <a>GraphObject.desiredSize</a> (width and height),
but you can also limit the vertical height with <a>TextBlock.maxLines</a>, which will limit the number allowed.
When there isn't enough space to display all text, you can decide how to use the remaining space with different
values for <a>TextBlock.overflow</a>. There are additional options in the wrapping section below.
</p>
<p>
The example below starts with a naturally sized TextBlock,
followed by ones with a max of 2 lines using the default <a>TextBlock.overflow</a> value of <code>OverflowClip</code>,
followed by one using the <a>TextBlock.overflow</a> value of <code>OverflowEllipsis</code>.
</p>
<pre class="lang-js" id="sizingTextBlocks2"><code>
diagram.contentAlignment = go.Spot.Center,
diagram.add(
$(go.Part, "Vertical",
// Allow any number of lines, no clipping needed:
$(go.TextBlock, { text: "a Text Block that takes 4 lines",
font: '14pt sans-serif',
background: "lightblue",
overflow: go.TextBlock.OverflowClip /* the default value */,
// No max lines
margin: 2,
width: 90 }),
// Allow only 2 lines, OverflowClip:
$(go.TextBlock, { text: "a Text Block that takes 4 lines",
font: '14pt sans-serif',
background: "lightblue",
overflow: go.TextBlock.OverflowClip /* the default value */,
maxLines: 2,
margin: 2,
width: 90 }),
// Allow only 2 lines, OverflowEllipsis:
$(go.TextBlock, { text: "a Text Block that takes 4 lines",
font: '14pt sans-serif',
background: "lightblue",
overflow: go.TextBlock.OverflowEllipsis,
maxLines: 2,
margin: 2,
width: 90 })
));
</code></pre>
<script>goCode("sizingTextBlocks2", 600, 200)</script>
<h2 id="Wrapping">Wrapping</h2>
<p>
Text can also be automatically wrapped onto additional lines.
In order for wrapping to happen, the <a>TextBlock.wrap</a> property must not be None,
and there must be some constraint on the width to be narrower than it would naturally be.
</p>
<p>
In the following examples, the first TextBlock gets its natural size,
the second is limited to 50 wide but is not allowed to wrap, and the
other examples are limited to the same width but are allowed to wrap.
</p>
<pre class="lang-js" id="wrappingTextBlocks"><code>
diagram.add(
$(go.Part, "Vertical",
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2 }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 50, wrap: go.TextBlock.None }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 50, wrap: go.TextBlock.WrapDesiredSize }),
$(go.TextBlock, { text: "a Text Block", background: "lightgreen", margin: 2,
width: 50, wrap: go.TextBlock.WrapFit })
));
</code></pre>
<script>goCode("wrappingTextBlocks", 600, 120)</script>
<h2 id="TextAlignment">Text Alignment</h2>
<p>
The <a>TextBlock.textAlign</a> property specifies where to draw the characters horizontally within the size of the <a>TextBlock</a>.
The value must be a CSS string.
</p>
<p>
This is different than the <a>GraphObject.alignment</a> property,
which controls where to place the object within the area allocated by the parent <a>Panel</a>.
</p>
<pre class="lang-js" id="textAlignTextBlocks"><code>
diagram.add(
$(go.Part, "Horizontal",
$(go.Panel, "Vertical",
{ width: 150, defaultStretch: go.GraphObject.Horizontal },
$(go.TextBlock, { text: "textAlign: 'left'", background: "lightgreen", margin: 2,
textAlign: "left" }),
$(go.TextBlock, { text: "textAlign: 'center'", background: "lightgreen", margin: 2,
textAlign: "center" }),
$(go.TextBlock, { text: "textAlign: 'right'", background: "lightgreen", margin: 2,
textAlign: "right" })
),
$(go.Panel, "Vertical",
{ width: 150, defaultStretch: go.GraphObject.None },
$(go.TextBlock, { text: "alignment: Left", background: "lightgreen", margin: 2,
alignment: go.Spot.Left }),
$(go.TextBlock, { text: "alignment: Center", background: "lightgreen", margin: 2,
alignment: go.Spot.Center }),
$(go.TextBlock, { text: "alignment: Right", background: "lightgreen", margin: 2,
alignment: go.Spot.Right })
)
));
</code></pre>
<script> goCode("textAlignTextBlocks", 600, 100)</script>
<p>
The <a>TextBlock.verticalAlignment</a> property controls the vertical alignment of the glyphs within the bounds.
Neither <a>TextBlock.textAlign</a> nor <a>TextBlock.verticalAlignment</a> affect the sizing of the TextBlock.
</p>
<pre class="lang-js" id="verticalAlignment"><code>
diagram.add(
$(go.Part, "Horizontal",
$(go.TextBlock, { text: "verticalAlignment: Top", verticalAlignment: go.Spot.Top,
width: 170, height: 60, background: "lightgreen", margin: 10 }),
$(go.TextBlock, { text: "verticalAlignment: Center", verticalAlignment: go.Spot.Center,
width: 170, height: 60, background: "lightgreen", margin: 10 }),
$(go.TextBlock, { text: "verticalAlignment: Bottom", verticalAlignment: go.Spot.Bottom,
width: 170, height: 60, background: "lightgreen", margin: 10 })
));
</code></pre>
<script> goCode("verticalAlignment", 600, 100)</script>
<h2 id="TextAlignAndMultilineOrWrapping">TextAlign and Multiline or Wrapping</h2>
<p>
The <a>TextBlock.textAlign</a> property is useful even when the TextBlock has its natural size.
This occurs when the text occupies multiple lines, whether by embedded newlines causing line breaks or by wrapping.
You can control whether text starting with the first newline character is ignored by setting the <a>TextBlock.isMultiline</a>.
By default both multiline and wrapping are enabled.
</p>
<pre class="lang-js" id="multilineTextBlocks"><code>
diagram.add(
$(go.Part, "Vertical",
$(go.TextBlock, { text: "a Text Block\nwith three logical lines\nof text",
background: "lightgreen", margin: 2,
isMultiline: false }),
$(go.TextBlock, { text: "a Text Block\nwith three logical lines\nof text",
background: "lightgreen", margin: 2,
isMultiline: true }),
$(go.TextBlock, { text: "a Text Block\nwith three logical lines\nof centered text",
background: "lightgreen", margin: 2,
isMultiline: true, textAlign: "center" }),
$(go.TextBlock, { text: "a single line of centered text that should" +
" wrap because we will limit the width",
background: "lightgreen", margin: 2, width: 80,
wrap: go.TextBlock.WrapFit, textAlign: "center" })
));
</code></pre>
<script>goCode("multilineTextBlocks", 600, 300)</script>
<h2 id="Indenting">Indenting</h2>
<p>
Each line of text is normally trimmed of leading and trailing spaces before rendering.
If you wish to indent a line of text by preserving leading spaces, start the line with the
zero-width space character: <code>\u200B</code>.
<a href="https://en.wikipedia.org/wiki/Zero-width_space" target="_blank">Wikipedia: Zero-width space</a>
</p>
<pre class="lang-js" id="indent"><code>
diagram.add(
$(go.Part, "Vertical",
$(go.TextBlock, { text: "left aligned\n\u200B indent two\n\u200B indent four",
background: "lightgreen", margin: 2, width: 150 }),
$(go.TextBlock, { text: "\u200B This is an indented paragraph consisting of lots of text that wraps naturally.",
background: "lightgreen", margin: 2, width: 150 })
));
</code></pre>
<script>goCode("indent", 600, 200)</script>
<p>
You can also use a <code>\u200B</code> character if you want to preserve spaces at the end of a line.
</p>
<h2 id="Flipping">Flipping</h2>
<p>
You can flip text horizontally and vertically with the <a>TextBlock.flip</a> property:
</p>
<pre class="lang-js" id="flipPictures"><code>
diagram.add(
$(go.Part, "Table",
{ defaultColumnSeparatorStrokeWidth: 3, defaultColumnSeparatorStroke: "gray", defaultSeparatorPadding: 5 },
$(go.TextBlock, { text: "Hello", column: 0, margin: 2, font: '26px serif',
flip: go.GraphObject.None
}),
$(go.TextBlock, "None (default)", { row: 1, column: 0 }),
$(go.TextBlock, { text: "Hello", column: 1, margin: 2, font: '26px serif',
flip: go.GraphObject.FlipHorizontal
}),
$(go.TextBlock, "FlipHorizontal", { row: 1, column: 1 }),
$(go.TextBlock, { text: "Hello", column: 2, margin: 2, font: '26px serif',
flip: go.GraphObject.FlipVertical
}),
$(go.TextBlock, "FlipVertical", { row: 1, column: 2 }),
$(go.TextBlock, { text: "Hello", column: 3, margin: 2, font: '26px serif',
flip: go.GraphObject.FlipBoth
}),
$(go.TextBlock, "FlipBoth", { row: 1, column: 3 })
));
</code></pre>
<script>goCode("flipPictures", 600, 160)</script>
<h2 id="Editing">Editing</h2>
<p>
<b>GoJS</b> also supports the in-place editing of text by the user.
You just need to set the <a>TextBlock.editable</a> property to true.
</p>
<p>
If you want to provide text validation of the user's input, you can set the <a>TextBlock.textValidation</a> property to a function.
You can also provide a more customized or sophisticated text editor by setting the <a>TextBlock.textEditor</a> property.
There is an example of text validation on the <a href="validation.html">Validation intro page.</a>
</p>
<pre class="lang-js" id="editingTextBlocks"><code>
diagram.add(
$(go.Part,
$(go.TextBlock,
{ text: "select and then click to edit",
background: "lightblue",
editable: true, isMultiline: false })
));
diagram.add(
$(go.Part,
$(go.TextBlock,
{ text: "this one allows embedded newlines",
background: "lightblue",
editable: true })
));
</code></pre>
<script>goCode("editingTextBlocks", 600, 100)</script>
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