Bindings are used to update a target property of a GraphObject from a source property in some model data. You should probably read the intro page on data binding: GoJS Data Binding -- Northwoods Software.
Yes, you can set the text property using model.setDataProperty(nodedata, "text", "New text value");, and you should do so within a transaction.
Actually, what Jon said is true only if you have a Binding on the TextBlock.text property.
$(go.TextBlock, . . .,
new go.Binding("text").makeTwoWay(), // TwoWay only if editable: true
new go.Binding("choices") // this should not be TwoWay unless you have code setting TextBlock.choices
)
Then you could do something like:
myDiagram.model.commit(function(m) {
m.set(nodedata, "text", "Some new text string");
}, "changed text");
This wraps whatever model changes you want to make into a single transaction.
After that, my function read all nodeDataArray loaded, getting first position of choice property:
UpdateTextChoicesAposCarregarModeloJson: function () {
var nodeDataArray = myDiagram.model.nodeDataArray;
for (var i = 0; i < nodeDataArray.length; i++) {
var node = OJC.Target.FindNodeDataByKey(nodeDataArray[i].key);
OJC.Target.CommitChanges(myDiagram.model, "Change text", node, "text", node.choices[0]);
}
},
I need that the first value of choice property, is defined in property: text, of node. So that the user see which previously chosen value.
UpdateTextChoicesAposCarregarModeloJson: function () {
var nodeDataArray = myDiagram.model.nodeDataArray;
for (var i = 0; i < nodeDataArray.length; i++) {
var node = OJC.Target.FindNodeDataByKey(nodeDataArray[i].key);
myDiagram.model.commit(function (m) {
m.set(node, "text", node.choices[0]);
}, "Text can be changed.");
}
},
I need that is defined this value of yellow, in text property of new go.Binding("choices").makeTwoWay()):
So, just to confirm, it is the case that you want to make sure that all of your nodes have an initial text value that is the first of that node’s choices? If so…
First, just as with any database programming you might do, you should not have transactions performed in a loop.
Second, I don’t know what your FindNodeDataByKey does, but it seems to me that you already have the node data object – it is the item in the Model.nodeDataArray that you are iterating over.
Third, and maybe this is not a problem with the data that you have, but your code is assuming that nodedata.choices is an Array of strings and the Array.length > 0.
myDiagram.model.commit(function (m) {
var nodeDataArray = m.nodeDataArray;
for (var i = 0; i < nodeDataArray.length; i++) {
var data = nodeDataArray[i];
var first = (data.choices && data.choices.length > 0) ? data.choices[0] : "default text";
m.set(data, "text", first);
}
}, "all text were changed");
So, just to confirm, it is the case that you want to make sure that all of your nodes have an initial text value that is the first of that node’s choices? If so…
**- Yes ! And my field is of type: choice. **
Second, I don’t know what your FindNodeDataByKey does, but it seems to me that you already have the node data object – it is the item in the Model.nodeDataArray that you are iterating over.
That’s right, I already have it. I used FindNodeDataByKey only to fetch the same node from LinkDataArray, to see if it would be possible to change the value…
Third, and maybe this is not a problem with the data that you have, but your code is assuming that nodedata.choices is an Array of strings and the Array.length > 0.
- Yes, is a string array.
But, this solution above still don’t showing the text value. My method:
UpdateTextChoicesAposCarregarModeloJson: function () {
myDiagram.model.commit(function (m) {
var nodeDataArray = m.nodeDataArray;
for (var i = 0; i < nodeDataArray.length; i++) {
var data = nodeDataArray[i];
var first = (data.choices && data.choices.length > 0) ? data.choices[0] : "default text";
m.set(data, "text", first);
}
}, "all text were changed");
},
And after that load, the field don’t is changed:
I need the value of the choice [0], to be in place of the “Select …”. It already brings value to the selection field, but I want it to already come as “selected.”
